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u cng ngh J2ME v th nghim lp trnh ng dng trn thit b di ng

I HC QUC GIA H NI

TRNG I HC CNG NGH

ng nh Hng

NGHIN CU CNG NGH J2ME V TH NGHIMLP TRNH NG DNG TRN THIT B DI NG

KHO LUN TT NGHIP I HC H CHNH QUY

Ngnh: Cng ngh thng tin

H NI - 2010

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I HC QUC GIA H NITRNG I HC CNG NGH

ng nh Hng

NGHIN CU CNG NGH J2ME V TH NGHIM LP TRNH NG DNGTRN THIT B DI NG



Cn b hng dn: ThS o Ngc Phong

I HC QUC GIA H NI

TRNG I HC CNG NGH

ng nh Hng

NGHIN CU CNG NGH J2ME V TH NGHIMLP TRNH NG DNG TRN THIT B DI NG



Cn b hng dn: ThS o Ngc Phong

H NI - 2010

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Li cm n

Sau mt thi gian tp trung nghin cu v thc hin, em hon thnh xong lunvn ca mnh. y l kt tinh ca mt qu trnh lao ng v hc tp nghim tc da trn

kin thc m em thu thp c di s truyn dy ca qu thy c.

Li u tin, em xin c gi li cm n su sc ti ThS. o Ngc Phong v thy

PGS TS Trnh Nht Tin, nhng ngi thy nhit tnh gip em cng nh cc bn

c thy hng dn trong sut qu trnh lm kha lun.

Em xin c cm n cc thy, cc c ging dy em trong sut bn nm qua.

Nhng kin thc m cc thy, cc c dy s mi l hnh trang gip em vng bc

trong tng lai.

Em cng xin c cm n tp th lp K51CC, mt tp th lp on kt vi nhng

ngi bn lun nhit tnh gip mi ngi, nhng ngi bn gip em trong sut

bn nm hc tp trn ging ng i hc.

Cui cng, em xin c gi li cm n su sc ti b m v gia nh em, nhng

ngi lun kp thi ng vin, khch l em, gip em vt qua nhng kh khn trong

cuc sng.

H Ni, thng 5 nm 2010

ng nh Hng

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Tm tt ni dung

Kha lun tp trung nghin cu cng ngh J2ME trn thit b di ng vi trngtm l phc v cho vic p ng cc dch v trc tuyn trong thc t cuc sng. B n cnh

cn c cc cng ngh lin quan nhm tr gip cc lp trnh vin d dng tip cn vi

vic xy dng cc ng dng trn thit b di dng mt cch linh hot v chuyn nghip.

Vic xy dng ng dng th nghim c p ng hai kha cnh, mt l xy dng

ng dng Web Services xy dng v qun tr ni dung, hai l th nghim ng dng

trn thit b di ng dnh cho ngi dng vi mt chng trnh m phng.

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Mc lc

Chng 1. Tng quan v lp trnh trn thit b di ng .................................................... 11.1. Thc t cc ng dng trn thit b di ng ______________________________ 1

1.2. c im ca lp trnh ng dng trn thit b di ng _____________________ 1

1.3. Cc cng ngh trong lp trnh trn thit b di ng _______________________ 1

Chng 2. Gii thiu J2ME................................................................................................ 32.1. Lch s hnh thnh J2ME ____________________________________________ 3

2.2. Cc phin bn, c im _____________________________________________ 32.2.1. MIDP 1.0 _______________________________________________________ 3

2.2.2 . MIDP 2.0 _______________________________________________________ 4

2.3. S khc nhau gia J2ME v J2SE _____________________________________ 5

2.4. Cc c im khc _________________________________________________ 7

Chng 3. Cng ngh lp trnh J2ME trn thit b di ng ............................................. 83.1. Kin trc _________________________________________________________ 8

3.2. Cc lp ca J2ME _________________________________________________ 10

3.3. Cc tng ca CLDC J2ME __________________________________________ 113.4. Tng my o Java _________________________________________________ 12

3.5. Tng cu hnh ____________________________________________________ 15

3.6. Tng hin trng ___________________________________________________ 16

3.7. MIDlet _________________________________________________________ 16

3.7.1. B khung MIDlet ________________________________________________ 17

3.7.2. Chu k sng ca MIDlet __________________________________________ 18

3.7.3. Tp tin JAR ____________________________________________________ 20

3.7.4. Tp tin k khai v JAD ___________________________________________ 203.7.5. B MIDlet _____________________________________________________ 21

Chng 4. Mt s cng ngh trong J2ME ....................................................................... 224.1. ha __________________________________________________________ 23

4.1.1. ha mc cao _________________________________________________ 23

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4.1.1.1. Text Box _____________________________________________________ 23

4.1.1.2. Form ________________________________________________________ 23

4.1.1.3. List _________________________________________________________ 234.1.1.4. Alert ________________________________________________________ 23

4.1.1.5. Form v cc Form Item __________________________________________ 24

4.1.1.5.1. String Item __________________________________________________ 24

4.1.1.5.2. Image Item __________________________________________________ 24

4.1.1.5.3. Text Field ___________________________________________________ 24

4.1.1.5.4. Date Field ___________________________________________________ 24

4.1.1.5.5. Choice Group ________________________________________________ 24

4.1.1.5.6. Gause ______________________________________________________ 25

4.1.1.5.7 . Ticker ______________________________________________________ 25

4.1.2. ha mc thp ________________________________________________ 25

4. 2. Lp trnh mng ___________________________________________________ 26

4.2.1. Khung mng CLDC tng qut ______________________________________ 26

4.2.2. Cc lp giao din kt ni __________________________________________ 28

4.2.3. Kt ni HTTP ___________________________________________________ 30

4.2.3.1. V d kt ni HTTP GET ________________________________________ 314.2.3.2. V d kt ni HTTP POST _______________________________________ 32

4.2.4. Triu gi CGI script ______________________________________________ 33

4.2.5. HTTP Request Header ____________________________________________ 34

4.3. Wireless Messaging API ____________________________________________ 34

Chng 5. Xy dng ng dng th nghim .................................................................... 385.1. Gii thiu ng dng _______________________________________________ 38

5.1.1. Mc tiu _______________________________________________________ 38

5.1.2. ng dng th nghim ____________________________________________ 385.2. Cc cng ngh s dng trong chng trnh _____________________________ 38

5.2.1. Lightweight UI Toolkit (LWUIT) ___________________________________ 38

5.2.2. XML __________________________________________________________ 40

5.2.2.1. Phn tch XML ________________________________________________ 41

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6.3.2. Trn thit b di ng______________________________________________ 61

6.4. M ngun tham kho ______________________________________________ 65

6.4.1. kxml2 _________________________________________________________ 656.4.2. Convert UTF-8 __________________________________________________ 65

6.4.3. LWUIT ________________________________________________________ 65

Chng 7. Ci t ng dng th nghim ....................................................................... 667.1. Web Services ____________________________________________________ 66

7.1.1. Ci t phn gi lp my ch Web trn my tnh c nhn ________________ 66

7.1.2. Cu hnh gi ng dng Web Services ________________________________ 66

7.2. Trn thit b di ng _______________________________________________ 67

7.2.1. Ci t phn mm m phng _______________________________________ 677.2.2 . Cu hnh ng dng th nghim _____________________________________ 67

Kt lun:....Ti liu tham kho:...

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Danh mc hnh v v bng biu

Hnh 1: Lch s J2ME............................................................................................... ....3Hnh 2: S kim tra ca b tin kim tra v b kim tra..........................................5

Hnh 3: M hnh Sandbox..6

Hnh 4: J2ME v J2SE...7

Hnh 5: Kin trc J2ME.8

Hnh 6: Phn khc dng thit b vi cc ngn ng Java....9

Hnh 7: Cc lp ca J2ME.11

Hnh 8: Tin trnh xy dng MIDlet. .13

Hnh 9: MIDlet..16

Hnh 10: B khung yu cu ti thiu cho mt ng dng MIDlet...17

Hnh 11: Chu k sng ca MIDlet.18

Hnh 12: Hai b MIDlet.21

Hnh 13. Phn cp lp ha.25

Hnh 14. Khung mng CLDC tng qut.26

Hnh 15. Cc lp kt ni. 27

Hnh 16. Cc trng thi kt ni HTTP29

Hnh 17: Cc phn tng lp trong LWUIT.38

Hnh 18 : ng dng th nghim vi LWUIT.39

Hnh 19 : Qu trnh x l trn web services45

Hnh 20 : Biu thc th lin kt ca h thng48

Hnh 21: Ngi qun tr ng nhp vo h thng...49Hnh 22: Khu vc mc nh ca h thng...49

Hnh 23: Khu vc hin th danh mc ca h thng.50

Hnh 24: Khu vc hin th ni dung bn tin50

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Hnh 25: Phn ty chn bn tri ca h thng.51

Hnh 26: Phn qun l nhm ngi dng51

Hnh 27: Phn qun l nhm thc n52

Hnh 28: Phn qun l Component.52

Hnh 29: Khu vc qun l ngn ng hin th trong h thng.53

Hnh 30: Kt qu thu c vi trnh duyt Mozilla Firefox 3.5.53

Hnh 31: Kt qu thu c vi trnh duyt Mozilla Firefox 3.554

Hnh 32: Mn hnh khi ng ca ng dng..55

Hnh 33: Mn hnh ty chn ng dng...57Hnh 34:Yu cu cho php kt ni ti dch v...57

Hnh 35: Cc qu trnh khi xem tin tc vi ng dng58

Hnh 36: To c s d liu trong phpmyadmin..66

Hnh 37: Qu trnh nhp c s d liu...66

Hnh 38: Bc u to Project mi67

Hnh 39: Cu hnh ban u.68

Hnh 40: Cu hnh chi tit...68

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Thut ng vit tt

API Application Program InterfaceASCII American Standard Code for Information Interchange

AWT Abstract Window ToolKit

CBS Cell Broadcast Short Message Service

CDC Connected Device Configuration

CDMA Code Division Multiple Access

CGI Common Gateway Interface

CLDC Connected Limited Device Configuration

CPU Central Processing UnitDOM Document Object Model

DTD Document Type Definition

EDGE Enhanced Data GSM Environment

GPRS General Packet Radio Service

GPS Global Positioning System

GSM Global System for Mobile Communications

GUI Graphical User Interface

HTML Hyper-Text Markup Language

HTTP Hyper-Text Transfer Protocol

IDE Integrated Development Environment

IP Internet Protocol

IR Infra Red

J2EE Java 2 Platform, Enterprise Edition

J2ME Java 2 Platform, Micro Edition

J2SE Java 2 Platform, Standard EditionJAD Java Application Descriptor

JAR Java Application Archive

JCP Java Community Process

JNI JavaNative Interface Support

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JSR Java Specification Request

KVM K Virtual Machine

MIDlet MIDP appletMIDP Mobile Information Device Profile

MVC Model-View-Controller

OTA Over The Air

PC Personal Computer

PDA Personal Digital Assistant

PHP PHP Hypertext Preprocessor

RMI Remote Method Invocation

RMS Record Management System

SAX Simple API for XML

SMS Short Message Service

UDP User Datagram Protocol

URL Uniform Resource Locator

WAP Wireless Application Protocol

WBXML Wap Binary XML

WMA Wireless Messaging APIXML eXensible Markup Language

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1

Chng 1. Tng quan v lp trnh trn thit b di ng

1.1. Thc t cc ng dng trn thit b di ngMng in thoi di ng xut hin ti Vit Nam t u nhng nm 1990 v theo

thi gian, s lng cc thu bao cng nh cc nh cung cp dch v di ng ti Vit Nam

ngy cng tng. Cng vi s pht trin ca s lng thu bao di ng l s a dng ha

cc dch v hng n thit b di ng. Trong nhng nm gn y, in thoi di ng

khng ch mang chc nng nghe gi hay nhn tin thng thng m cn l mt thit b

gii tr, tra cu thng tin hay tr gip c nhn c lc. Do vy, xy dng cc ng dng

cho in thoi di ng ang l mt yu cu tt yu trong xu th hin nay. Nm 2009, cc

nh mng ln bt tay vo vic trin khai mng 3G ti Vit Nam, nm 2010 tr i cnh gi l nhng nm n r cc dch v tin ch trn thit b di ng c bit l cc ng

dng trc tuyn trn nn thit b di ng.

Trong tng lai, vi s pht trin mnh m ca cc thit b di ng v phn cng

cng nh cht lng mng di ng, ngnh cng nghip phn mm trn thit b di ng s

gt hi c nhiu thnh qu v n s thu ht lng ln cc nhn cng cng nh ha hn

nhiu iu th v.

1.2. c im ca lp trnh ng dng trn thit b di ng

c trng thit b di ng h tr ti nguyn phn cng khng cao, vi c im lb nh hn ch, kh nng x l chm, cc thit b m rng cn hn ch, v vy lp trnh

ng dng trn thit b di ng i hi cc lp trnh vin qun l tt b nh, ln ca m

ngun, cng nh cc th vin hay c ch lm vic vi cc file media.

Do thit b di ng c pht trin bi nhiu hng nn cu trc phn cng a dng

v kh c chun chung nn yu cu cc ngn ng lp trnh c lp vi phn cng v linh

hot l rt cao.

1.3. Cc cng ngh trong lp trnh trn thit b di ng

Hai hng pht trin ng dng trn in thoi di ng ph bin hin nay l s dngngn ng C++ trn nn h iu hnh Symbian v J2ME. Khong my nm tr li y,

nn tng di ng m Android ca Google v iPhone OS ca Apple cng ang c tn hiu

pht trin rt kh quan.

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2

Cc ng dng vit trn nn Symbian c cc u th truy cp trc tip cc ti nguyn

ca in thoi cng nh h tr h thng tp tin, th mc nh my tnh c nhn v c

h tr trc tip bi h iu hnh. Tuy nhin h iu hnh Symbyan li c kch thc khln nn ch c cc th h in thoi tng i cao cp, v xy dng ng dng dng

Symbian API cng phc tp hn.

i trng vi Symbian API l cng ngh J2ME vi kch thc nh gn, tin dng,

c h tr bi hu ht cc th h in thoi mi ra i, k c cc in thoi c h iu

hnh Symbian. J2ME khng nhng l mt ngn ng hng n cc thit b di ng m

cn l ngn ng chnh lp trnh trn cc thit b gia dng, th tn dng in t v cc

thit b thng minh khc. Chng ta c th ni i tng ca ngn ng J2ME l rng hn

rt nhiu so vi C++ trn nn Symbyan. Ti thi im hin ti, ngn ng J2ME khng htr c nhiu tnh nng nh trn C++ trn nn Symbian nhng li c nhng u im tri

hn. J2ME l mt ngn ng nh, gn nhng rt cht ch v d nm bt, vi nhng lp

trnh vin c kinh nghim vi Java vic lp trnh vi J2ME tr nn rt d dng. J2ME

cn l ngn ng c cc t chc m ngun m ng h mnh m v pht trin rt nhanh

chng.

Nm 2007, lin minh Google, OHA ra mt nn tng Android, n c gii thiu l

mt nn tng m vi s kt hp ca ngn ng Java v h iu hnh Linux 2.6. Trong

Android, nt c trng ni bt l tnh tng thch ln nhau, kh nng h tr thit b, cngnh ngn ng Java SE cng vi vic tch hp s dng c s d liu ngay trong thit b.

Mt i th rt ng gm trong th phn ca in thoi thng minh l iPhone ca

Apple, cc ng dng ca iPhone c vit bng ngn ng Objective C hot ng trn nn

iPhone OS. c im chnh ca Objective C l ngn ng hng i tng nhng c h

tr nhiu bi cc API nn vic x l a phng tin ni tri, iu ny cng to nn

thng hiu nh m ca Apple.

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3

Chng 2. Gii thiu J2ME

2.1. Lch s hnh thnh J2MEJ2ME c pht trin t kin trc Java Card, Embeded Java v Personal Java ca

phin bn Java 1.1. n s ra i ca Java 2 th Sun quyt nh thay th Personal Java v

c gi vi tn l Java 2 Micro Edition, hay vit tt l J2ME. J2ME l nn tng cho cc

thit b c tnh cht nh gn:

Hnh 1: Lch s J2ME.

2.2. Cc phin bn, c im

C hai phin bn MIDP chnh trong ngn ng J2ME:

2.2.1. MIDP 1.0

Phin bn ny xut hin u tin vo nm 2001, v ph bin rng ri M (dn u

l Motorola ). Vi th h ban u ny, cc chng trnh ch c h tr c bn nh giao

din chng trnh, giao thc HTTP v cc tnh nng h tr m thanh hay kh nng vit

game cha c h tr.

Cc lp v kiu d liu: Phn ln cc lp m cc lp trnh vin Java quen

thuc vn cn c gi li v d nh cc lp trong gi java.util nh Stack, Vector vHastable cng nh Enumeration.

H tr i tng Display: ng nh tn gi mt chng trnh MIDP s h

tr duy nht mt i tng Display l i tng qun l vic hin th d liu trn mn

hnh in thoi.

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6

B tin kim tra

Cc tp tin lp c gn nhn bng mt thuc tnh trn my trm. Thuc tnh ny

sau c b tin kim tra kim tra trc khi m chng trnh c giao cho KVM hay

b bin dch m bytecode.

Mt b phn khc ca bo mt trong CLDC l m hnh sandbox.

Hnh 3 biu din khi nim m hnh sandbox:

Hnh 3: M hnh Sandbox.

M hnh Sandbox

ng dng J2ME t trong mt sandbox b gii hn truy xut n ti nguyn ca

thit b v khng c truy xut n My o Java hay b np chng trnh. ng dng

c truy xut n cc API ca CLDC v MIDP. ng dng c truy xut ti nguyn

ca thit b di ng ch khi nh sn xut in thoi di ng cung cp cc API tng ng.

Nhng cc API ny khng phi l mt phn ca J2ME.

Th h k tip ca CLDC l c t JSR - 139 v c gi l CLDC th h k tip.

N s nhm n cc vn nh nng cao vic qun l li v c th php ton s thc.

Ti nguynthit b

Cc CLDCAPI

Cc MIDPAPI

Chng trnhng dngJava

API

API

API

ClassLoader

H thngJVM

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7

Hnh 4: J2ME v J2SE.

2.4. Cc c im khc

Khi vit J2ME, do c tnh cn nh gn v bo mt tt cho thit b di ng nn Sun

lc bt cc lp s ch li cc lp c bn, do vy, v bn cht J2ME l ngn ng

k tha v tinh lc ca phin bn J2SE.

Bn cnh nhng MIDP v c vit cho thit b c cu hnh ln b nh thp nn

n khng h tr:

Php tnh du phy ng (floating point): Php tnh ny i hi rt nhiu

ti nguyn CPU v phn ln cc CPU cho cc thit b di ng khng h tr php tnh ny,

do MIDP cng khng c.

B np class (Class Loader).

H tr t kha finalize() nh trong J2SE: Vic dn dp ti nguyn trc

khi n b xa c y v pha cc lp trnh vin.

H tr hn ch thao tc bt li.

Phn ln cc th vin API cho Swing v AWT khng th s dng c

trong MIDP.

Khng h tr cc tnh nng qun l file v th mc: y c th lm bnngc nhin nhng thc t l cc thit b J2ME khng c h tr cc thit b lu tr thng

thng nh cng v.v. Tuy nhin, iu khng c ngha l bn phi mt i mi d liu

quan trng mi khi tt my, Sun cung cp mt chc nng khc tng ng gi l

Record Management system (RMS) cung cp kh nng lu tr cho cc thit b ny.

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8

Chng 3. Cng ngh lp trnh J2ME trn thit b di ng

3.1. Kin trc

Hnh 5: Kin trc J2ME.

Configuration: l c t nh ngha mt mi trng phn mm cho mt dng cc

thit b c phn loi bi tp hp cc c tnh, v d nh:

o Kiu v s lng b nh

o Kiu v tc vi x l

o Kiu mng kt ni

Do y l cc c t nn nh sn xut thit b u cui nh Samsung, Nokiabt

buc phi thc thi y cc c t do Sun qui nh cc lp trnh vin c th da vo

mi trng lp trnh nht qun v thng qua s nht qun ny, cc ng dng c to ra

c th mang tnh c lp thit b cao nht c th. V d nh mt lp trnh vin vit chng

trnh game cho in thoi Samsung th c th sa i chng trnh mt cch ti thiunht c th chy trn in thoi Nokia

Hin nay Sun a ra hai dng cu hnh:

CLDC (Connected Limited Device Configuration-Cu hnh thit b kt ni

gii hn): c thit k nhm vo th trng cc thit b cp thp, cc thit b ny

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9

thng thng l my in thoi di ng v PDA vi khong 512 KB b nh. V ti

nguyn b nh hn ch nen CLDC c gn vi Java khng dy, dng cho php ngi

dng mua hoc ti v cc ng dng Java, v d nh Midlet. CDC (Connected Device Configuration-Cu hnh thit b kt ni): CDC

c a ra nhm n cc thit b c tnh nng mnh hn dng thit b thuc CLDC

nhng vn yu hn h thng my bn s dng J2SE. Nhng thit b ny c nhiu b nh

hn (thng thng trn 2 Mb) v c b x l mnh hn. Cc sn phm ny c th k n

nh cc my PDA cp cao, in thoi web, cc thit b gia dng

C hai dng cu hnh k trn u cha my o Java JVM (Java Virtual Machine)

v tp hp cc lp Java c bn cung cp mt mi trng cho cc ng dng J2ME. Tuy

nhin, vi cc thit b cp thp, do hn ch v ti nguyn nh b nh v b x l nn

khng th yu cu my o h tr tt c cc tnh nng nh my o ca J2SE, n c, cc

thit b thuc CLDC khng c phn cng yu cu cc php tnh ton du phy ng, nn

my o thuc CLDC khng c yu cu h tr kiu float v double.

Hnh 6: Phn khc dng thit b vi cc ngn ng Java.

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10

CLDC CDC

RAM >=32Kb, =256Kb

ROM >=128Kb, =512Kb

Ngun nng lng C gii hn Khng gii hn

Network Chm Nhanh

Bng so snh cc thng s k thut gia CLDC v CDC

Profile: profile l m rng ca configuration bng cch thm vo cc lp b tr

cc tnh nng cho tng thit b chuyn bit. C hai configuration u c nhng profile lin

quan v t nhng profile ny c th dng cc lp ca nhau. Chnh v vy m do miprofile nh ngha mt tp hp cc lp khc nhau nn thng th ta khng th chuyn ng

dng Java vit cho profile ny sang mt my h tr profile khc. Cng v vy m khng

th ly ng dng vit trn J2SE hay J2EE chy trn my h tr J2ME. Sau y l mt

s profile tiu biu:

o Mobile Information Device Profile (MIDP): profile ny s b sung cc tnh

nng nh h tr kt ni, cc thnh phn h tr giao din ngi dng vo CLDC.

Profile ny c thit k ch yu nhm vo in thai di ng vi c tnh l mn

hnh hin th hn ch, dung lng cha c hn. Do MIDP s cung cp mt giao dinngi dng n gin v cc tnh nng mng n gin da trn HTTP. C th ni MIDP l

profile ni ting nht bi v n l kin thc c bn cho lp trnh Java trn cc my di

ng (Wireless Java).

o PDA Profile: tng t MIDP, nhng vi th trng l cc my PDA vi

mn hnh v b nh ln hn.

o Foundation Profile: cho php m rng cc tnh nng ca CDC vi phn ln

cc th vin ca b Core Java2 1.3.

Ngoi ra cn c Personal Basis Profile, Personal Profile, RMI Profile, Game Profile.

3.2. Cc lp ca J2ME

Mc tiu ca J2ME l gip cc lp trnh vin vit cc ng dng c lp vi thit b

di ng, vit mt ln ng mi ch, khng cn quan tm n phn cng thc s. lm

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12

ny cung cp mt s chun ha cho cc thit b di ng ng dng J2ME sau khi

bin dch c th hot ng trn bt k thit b di ng no c J2ME KVM.

Tng cu hnh (Configuration Layer)Tng cu hnh ca CLDC nh ngha giao din ngn ng Java (Java language

interface) c bn cho php chng trnh Java chy trn thit b di ng. y l mt tp

cc API nh ngha li ca ngn ng J2ME.

Tng hin trng (Profile Layer)

Tng hin trng hay MIDP ( Mobile Information Device Profile ) cung cp tp cc

API hu dng hn cho lp trnh vin. Mc ch ca hin trng l xy dng trn lp cu

hnh v cung cp nhiu th vin ng dng hn. MIDP nh ngha cc API ring bit cho

thit b di ng. Cng c th c cc hin trng v cc API khc ngoi MIDP c dngcho ng dng. V d, c th c hin trng PDA nh ngha cc lp v phng thc hu

dng cho vic to cc ng dng PDA (lch, s hn, s a ch). Cng c th c mt hin

trng nh ngha cc API cho vic to cc ng dng Bluetooth. Thc t, cc hin trng k

trn v tp cc API ang c xy dng. Chun hin trng PDA l c t JSR-75 v

chun Bluetooth API l c t JSR-82 vi JSR l vit tt ca Java Specification Request.

3.4. Tng my o Java

Vai tr ca my o Java hay KVM l dch m bytecode c sinh ra t chng trnhJava bin dch sang ngn ng my. Chnh KVM s chun ha output ca cc chng

trnh Java cho cc thit b di ng khc nhau c th c b vi x l v tp lnh khc nhau.

Khng c KVM, cc chng trnh Java phi c bin dch thnh tp lnh cho mi thit

b di ng. Nh vy lp trnh vin phi xy dng nhiu ch cho mi loi thit b di ng.

Hnh di y biu din tin trnh xy dng ng dng MIDlet hon chnh v vai tr ca

KVM.

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Hnh 8: Tin trnh xy dng MIDlet.

Qu trnh pht trin ng dng MIDlet vi IDE ( Intergrated Development

Environment ):

Lp trnh vin: Bc u tin l lp trnh vin phi to m ngun Java, c th c

nhiu tp tin (*.java).

Trn IDE:

B bin dch Java (Java Compiler): Bin dch m ngun thnh m bytecode.

M bytecode ny s c KVM dch thnh m my. M bytecode bin dch sc lu trong cc tp tin *.class v s c mt tp tin *.class sinh ra cho mi lp Java.

B tin kim tra (Preverifier): Kim tra tnh hp l ca m bytecode. Mt trong

nhng yu cu an ton ca J2ME l bo m m bytecode chuyn cho KVM l hp l v

khng truy xut cc lp hay b nh ngoi gii hn ca chng. Do tt c cc lp u

Tp tin ngunJava*.java

Tp tin ngunJava*.java

B bin dch vb tin kimtra Java

Tp tin lp Java*.class

Tp tin lp Java*.class

Tp tin JAR

Trm pht trin

B bin dchm bytecodeKVM

M bytecode

M my

Thit b ch

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B tin kim tra kim tra tt c cc lp u c mt thuc tnh hp l c thm

vo bi b tin kim tra trn trm pht trin ng dng. Nu tin trnh tin kim tra tht bi

th ng dng s khng c download v thit b di ng.

B qun l ng dng: Lu tr chng trnh.

B qun l ng dng trn thit b di ng s lu tr chng trnh trn thit b di

ng. B qun l ng dng cng iu khin trng thi ca ng dng trong thi gian thc

thi v c th tm dng ng dng khi c cuc gi hoc tin nhn n.

Ngi dng: Thc thi ng dng.

B qun l ng dng s chuyn ng dng cho KVM chy trn thit b di ng.

KVM: Thc thi m bytecode khi chng trnh chy.

KVM dch m bytecode sang ngn ng my ca thit b di ng chy.

3.5. Tng cu hnh

Tng J2ME k trn tng KVM l CLDC hay Cu hnh thit b kt ni gii hn. Mc

ch ca tng ny l cung cp mt tp ti thiu cc th vin cho php mt ng dng Java

chy trn thit b di ng. N cung cp c s cho tng Hin trng, tng ny s cha nhiu

API chuyn bit hn.

CLDC Connected Limited Device Configuration:

Phm vi: nh ngha cc th vin ti thiu v cc API.

nh ngha:

o Tng thch ngn ng JVM

o Cc th vin li

o I/O

o Mng

o Bo mt

o Quc t ha

Khng nh ngha:

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o Chu k sng ng dng

o Giao din ngi dng

o Qun l s kin

o Giao din ng dng v ngi dng

Cc lp li Java c bn, input/output, mng, v bo mt c nh ngha trong

CLDC. Cc API hu dng hn nh giao din ngi dng v qun l s kin c dnh

cho hin trng MIDP.

3.6. Tng hin trng

Tng J2ME cao nht l tng hin trng v mc ch ca n l nh ngha cc API

cho cc thit b di ng. Mt thit b di ng c th h tr nhiu hin trng. Mt hin

trng c th p t thm cc gii hn trn cc loi thit b di ng (nh nhiu b nh hn

hay phn gii mn hnh cao hn). Hin trng l tp cc API hu dng hn cho cc ng

dng c th. Lp trnh vin c th vit mt ng dng cho mt hin trng c th v khng

cn quan tm n n chy trn thit b no.

3.7. MIDlet

Cc ng dng J2ME c gi l MIDlet (Mobile Information Device applet).

Hnh 9: MIDlet

Thng bo import dng truy xut cc lp ca CLDC v MIDP.

CLDC

import javax.microedition.midlet.*

import java.lang.Math.*

public class HelloWorld extends MIDlet

MIDP

HelloWorld.java

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Lp chnh ca ng dng c nh ngha l lp k tha lp MIDlet ca MIDP. C

th ch c mt lp trong ng dng k tha lp ny. Lp MIDlet c trnh qun l ng

dng trn in thoi di ng dng khi ng, dng, v tm dng MIDlet (v d, trongtrng hp c cuc gi n).

3.7.1. B khung MIDlet

Mt MIDlet l mt lp Java k tha (extend) ca lp tru tng

java.microedition.midlet.MIDlet v thc thi (implement) cc phng thc startApp(),

pauseApp(), v destroyApp().

Hnh 10: B khung yu cu ti thiu cho mt ng dng MIDlet.

B khung MIDlet1) Pht biu import

Cc pht biu import c dng include cc lp cn thit t cc th vin CLDC

v MIDP.

2) Phn chnh ca MIDlet

MIDlet c nh ngha nh mt lp k tha lp MIDlet. Trong v d ny

MIDletExample l bt u ca ng dng.

3) Hm to (Constructor)

Hm to ch c thc thi mt ln khi MIDlet c khi to ln u tin. Hm to

s khng c gi li tr phi MIDlet thot v sau khi ng li.

4) startApp()

import javax.microedition.midlet.*;

public class MIDletExample extends MIDlet{

public MIDletExample() {}

public void startApp() {}

public void pauseApp() {}

public void destroyApp(boolean unconditional) {}

}

1

2

34

56

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Phng thc startApp() c gi bi b qun l ng dng khi MIDlet c khi

to, v mi khi MIDlet tr v t trng thi tm dng.

5) pauseApp()

Phng thc pauseApp() c gi bi b qun l ng dng mi khi ng dng cn

c tm dng (v d, trong trng hp c cuc gi hoc tin nhn n). Cch thch hp

s dng pauseApp() l gii phng ti nguyn v cc bin dnh cho cc chc nng

khc trong in thoi trong khi MIDlet c tm dng. Cn ch rng khi nhn cuc gi

n h iu hnh trn in thoi di ng c th dng KVM thay v dng MIDlet. Vic

ny khng c cp trong MIDP m l do nh sn xut quyt nh s chn cch

no.6) destroyApp()

Phng thc destroyApp() c gi khi thot MIDlet. (v d khi nhn nt exit trong

ng dng). N ch n thun l thot MIDlet. N khng tht s xa ng dng khi in

thoi di ng. Phng thc destroyApp() ch nhn mt tham s Boolean. Nu tham s

ny l true, MIDlet c tt v iu kin. Nu tham s l false, MIDlet c thm ty chn

t chi thot bng cch nm ra mt ngoi l MIDletStateChangeException.

Tm tt cc trng thi khc nhau ca MIDlet:To (Created) Hm to MIDletExample() c gi mt mt ln.

Hot ng (Active) Phng thc startApp() c gi khi chng trnh bt u

hay sau khi tm dng.

Tm dng (Paused) Phng thc pauseApp() c gi. C th nhn cc s kin

timer.

Hy (Destroyed) Ph c destroy() c gi.

3.7.2. Chu k sng ca MIDlet

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Hnh 11: Chu k sng ca MIDlet.

Chu k sng ca MIDlet

Khi ngi dng yu cu khi ng ng dng MIDlet, b qun l ng dng s thc

thi MIDlet (thng qua lp MIDlet). Khi ng dng thc thi, n s c xem l ang

trng thi tm dng. B qun l ng dng gi hm to v hm startApp(). Hm startApp()

c th c gi nhiu ln trong sut chu k sng ca ng dng. Hm destroyApp() ch c

th gi t trng thi hot ng hay tm dng.

Lp trnh vin cng c th iu khin trng thi ca MIDlet.

Cc phng thc dng iu khin cc trng thi ca MIDlet:

resumeRequest(): Yu cu vo ch hot ng

V d: Khi MIDlet tm dng, v mt s kin timer xut hin.

notifyPaused(): Cho bit MIDlet t nguyn chuyn sang trng thi tm dng

V d: Khi i mt s kin timer.

notifyDestroyed(): Sn sng hy

V d: X l nt nhn Exit

Lp trnh vin c th yu cu tm dng MIDlet trong khi i mt s kin timer

ht hn. Trong trng hp ny, ph c notifyPaused() s c dng yu cu

b qun l ng dng chuyn ng dng sang trng thi tm dng.

Tm dng Hot ng Hy

Chng trnh

c to

pauseApp()

destroyApp()

startApp() destroyApp()

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3.7.3. Tp tin JAR

Cc lp bin dch ca ng dng MIDlet c ng gi trong mt tp tin JAR

(Java Archive File). y chnh l tp tin JAR c download xung in thoi di ng.

Tp tin JAR cha tt c cc tp tin class t mt hay nhiu MIDlet, cng nh cc ti

nguyn cn thit. Hin ti, MIDP ch h tr nh dng hnh .png (Portable Network

Graphics). Tp tin JAR cng cha tp tin k khai (manifest file) m t ni dung ca

MIDlet cho b qun l ng dng. N cng phi cha cc tp tin d liu m MIDlet cn.

Tp tin JAR l ton b ng dng MIDlet. MIDlet c th load v triu gi cc phng thc

t bt k lp no trong tp tin JAR, trong MIDP, hay CLDC. N khng th truy xut cc

lp khng phi l b phn ca tp tin JAR hay vng dng chung ca thit b di ng.3.7.4. Tp tin k khai v JAD

Tp tin k khai (manifest.mf) v tp tin JAD (Java Application Descriptor) m t

cc c im ca MIDlet. S khc bit ca hai tp tin ny l tp tin k khai l mt phn

ca tp tin JAR cn tp tin JAD khng thuc tp tin JAR. u im ca tp tin JAD l cc

c im ca MIDlet c th c xc nh trc khi download tp tin JAR. Ni chung,

cn t thi gian download mt tp tin vn bn nh hn l download mt tp tin JAR.

Nh vy, nu ngi dng mun download mt ng dng khng c thit b di ng h

tr (v d, MIDP 2.0), th qu trnh download s b hy b thay v phi i download ht

ton b tp tin JAR.

M t ni dung ca tp tin JAR:

Cc trng yu cu

o Manifest-Version // Phin bn tp tin Manifest

o MIDlet-Name // Tn b MIDlet (MIDlet suite)

o MIDlet-Version // Phin bn b MIDlet

o MIDlet-Vendor // Nh sn xut MIDlet

o MIDlet- for each MIDlet // Tn ca MIDlet

o MicroEdtion-Profile // Phin bn hin trng

o MicroEdtion-Configuration // Phin bn cu hnh

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V d mt tp tin manifest.mf:

MIDlet-Name: CardGames

MIDlet-Version: 1.0.0

MIDlet-Vendor: Sony Ericsson

MIDlet-Description: Set of Card Games

MIDlet-Info-URL: http://www.semc.com/games

MIDlet-Jar-URL: http://www.semc.com/j2me/games

MIDlet-Jar-Size: 1063

MicroEdtion-Profile: MIDP-1.0

MicroEdtion-Configuration: CLDC-1.0

MIDlet-1: Solitaire, /Sol.png, com.semc.Solitaire

MIDlet-2: BlackJack, /Blkjk.png, com.semc.BlackJack

Tp tin JAD cha cng thng tin nh tp tin manifest. Nhng n nm ngoi tp tinJAR.

Cc thuc tnh MIDlet-Name, MIDlet-Version, v MIDlet-Vendor phi c lp li

trong tp tin JAD v JAR. Cc thuc tnh khc khng cn phi lp li. Gi tr trong tp tin

m t s gi tr ca tp tin manifest.

3.7.5. B MIDlet

Mt tp cc MIDlet trong cng mt tp tin JAR c gi l mt b MIDlet (MIDlet

suite). Cc MIDlet trong mt b MIDlet chia s cc lp, cc hnh nh, v d liu lu tr

bn vng. cp nht mt MIDlet, ton b tp tin JAR phi c cp nht.

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Hnh 12: Hai b MIDlet.

Cc b MIDlet

Trong hnh trn, mt b MIDlet cha MIDlet1, MIDlet2, v MIDlet3. B kia ch

cha MIDlet4. Ba MIDlet trong b u tin truy xut cc lp v d liu ca nhau nhng

khng truy xut n cc lp hay d liu ca MIDlet4. Ngc li, MIDlet4 cng khng

truy xut c cc lp, hnh nh, v d liu ca chng.

[ Ngun [9] ].

midlet1.class

funstuff.class

midlet2.class

afile.class

midlet3.class

needed.class

Lu tr bnvng 1

Lu tr bnvng 2

Lu tr bnvng 3

midlet4.class

Lu tr bnvng 4

MIDlet1, MIDlet2, MIDlet3

B MIDlet 1 B MIDlet 2

MIDlet4

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Chng 4. Mt s cng ngh trong J2ME

4.1. haCc lp MIDP cung cp hai mc ha: ha mc thp v ha mc cao.

ha mc cao dng cho vn bn hay form. ha mc thp dng cho cc ng dng tr

chi yu phi v ln mn hnh.

4.1.1. ha mc cao

ha mc cao l lp con ca lp Screen. N cung cp cc thnh phn nh text

box, form, list, v alert. Ta t iu khin sp xp cc thnh phn trn mn hnh. Vic sp

xp tht s ph thuc vo nh sn xut.4.1.1.1. Text Box

Lp TextBox cho php ngi dng nhp v son tho vn bn. Lp trnh vin c th

nh ngha s k t ti a, gii hn loi d liu nhp (s hc, mt khu, email,) v hiu

chnh ni dung ca textbox. Kch thc tht s ca textbox c th nh hn yu cu khi

thc hin thc t (do gii hn ca thit b). Kch thc tht s ca textbox c th ly bng

phng thc getMaxSize().

4.1.1.2. FormForm l lp hu dng nht ca cc lp Screen bi v n cho php cha nhiu item

trn cng mt mn hnh. Cc item c th l DateField, TextField, ImageItem, TextItem,

ChoiceGroup.

4.1.1.3. List

Lp List l mt Screen cha danh sch cc la chn chng hn nh cc radio

button. Ngi dng c th tng tc vi list v chn mt hay nhiu item.

4.1.1.4. Alert

Alert hin th mt mn hnh pop-up trong mt khong thi gian. Ni chung n dng

cnh bo hay bo li. Thi gian hin th c th c thit lp bi ng dng. Alert c

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th c gn cc kiu khc nhau (alarm, confirmation, error, info, warning), cc m thanh

tng ng s c pht ra.

4.1.1.5. Form v cc Form Item

S dng form cho php nhiu item khc nhau trong cng mt mn hnh. Lp trnh

vin khng iu khin s sp xp cc item trn mn hnh. Sau khi nh ngha i tng

Form, sau s thm vo cc item.

Mi item l mt lp con ca lp Item:

4.1.1.5.1. String Item

Public class StringItem extends ItemStringItem ch l mt chui hin th m ngi dng khng th hiu chnh. Tuy

nhin, c nhn v ni dung ca StringItem c th c hiu chnh bi ng dng.

4.1.1.5.2. Image Item

public class ImageItem extends Item

ImageItem cho php thm vo hnh form. ImageItem cha tham chiu n mt i

tng Image phi c to trc .

4.1.1.5.3. Text Field

public class TextField extends Item

TextField cho php ngi dng nhp vn bn. N c th c gi tr khi to, kch

thc ti a, v rng buc nhp liu. Kch thc tht s c th nh hn yu cu do gii

hn ca thit b di ng.

4.1.1.5.4. Date Field

public class DateField extends ItemDateField cho php ngi dng nhp thng tin ngy thng v thi gian. C th xc

nh gi tr khi to v ch nhp ngy thng (DATE), thi gian (TIME), hoc c hai.

4.1.1.5.5. Choice Group

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Hnh 14. Khung mng CLDC tng qut.

Kt ni mng c xy dng bng phng thc open() ca lp Connector trong

CLDC. Phng thc open() nhn mt tham s u vo l chui. Chui ny dng xc

nh giao thc. nh dng ca chui l:

protocol:address;parameters

CLDC ch xc nh tham s l mt chui nhng n khng nh ngha bt k giao

thc tht s no. Cc hin trng c th nh ngha cc giao thc kt ni nh HTTP,

socket, cng truyn thng, datagram, Phng thc open() tr v mt i tngConnector. i tng ny sau c th ng vai tr l mt giao thc xc nh c nh

ngha trong hin trng.

Connector.open(:;);

Mt s giao thc v d (nhng khng c h tr bi CLDC hay MIDP):

Socket: Connector.open(socket://199.3.122.21:1511);

Comm port: Connector.open(comm:0;baudrate=9600);

Datagram: Connector.open(Datagram://19.3.12.21:1511);

Files: Connector.open(file:/filename.txt);

MIDP h tr giao thc HTTP:

HTTP: Connector.open(http://www.sonyericsson.com);

Socket:Comm ports:

Datagrams:Files:HTTP:

Connector.open(string);Vi nh dng string nh sau::;

Connector.open(:;);Tr v mt i tng Connection

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Tr v mt i tng Connection

V d trn minh ha kt ni socket, cng truyn thng, datagram, file v HTTP. Tt

c cc kt ni mng u c cng nh dng, khng quan tm n giao thc tht s. N ch

khc nhau chui chuyn cho phng thc open(). Phng thc open() s tr v mt i

tng Connection ng vai tr l lp giao thc (v d. HttpConnection) c th s dng

cc phng thc cho giao thc . J2ME ch nh ngha mt kt ni l kt ni HTTP

trong MIDP.

4.2.2. Cc lp giao din kt ni

Dn xut t lp Connection l nhiu lp giao din con cung cp khung kt ni

mng. Cc giao din khc nhau h tr cc loi thit b di ng khc nhau.

Hnh 15. Cc lp kt ni.

Sau y l m t cc giao din kt ni c nh ngha trong CLDC

StreamConnectionNotifier

Connection

StreamConnectionNotifier OutputConnectionInputConnection DatagramConnection

StreamConnection

InputConnection

HttpConnection

CLDC

MIDP

Connection c = Connector.open(url);

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Giao din StreamConnectionNotifier c dng khi i mt kt ni pha server

c thit lp. Phng thc acceptAndOpen() b chn cho n khi client thit lp kt ni.

Giao din DatagramConnection

Kt ni datagram cung cp kiu truyn thng gi khng chng thc. Datagram cha

gi d liu v a ch. Chui a ch c nh dng sau:

datagram:[//{host}]:{port}

Nu tham s host c xc nh, th datagram m kt ni ch client. Nu tham

s host khng c xc nh, th datagram c m ch server

c = Connector.open("datagram://192.365.789.100:1234"); // Ch clientc = Connector.open("datagram://:1234"); // Ch server

Giao din InputConnection

Giao din InputConnection dng thc hin mt lung nhp tun t d liu ch c.

Giao din OutputConnection

Giao din OutputConnection dng thc hin mt lung xut d liu ch vit.

Giao din StreamConnectionGiao din StreamConnection l kt hp ca c hai giao din InputConnection v

OutputConnection. N dng cho cc thit b di ng c truyn thng hai chiu.

Giao din ContentConnection

Giao din ContentConnection k tha giao din StreamConnection v thm vo cc

phng thc getType(), getEncoding(), v getLength(). N cung cp c s cho giao din

HttpConnection ca MIDP.

Giao din HttpConnection

Giao din HttpConnection c nh ngha trong MIDP v k tha giao din

ContentConnection ca CLDC. Giao din ny cung cp cc ph c thit lp mt

kt ni HTTP.

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i tng Connection ng vai tr l mt lp HttpConnection. Phng thcopenInputStream() s lm cho kt ni chuyn sang trng thi Kt ni. V khng c yu

cu phng thc no, kt ni s mc nh l mt kt ni HTTP GET.Phng thc getLength() s tr v chiu di ca d liu gi t server. Nu bit c

chiu di, th bin len s cha chiu di d liu v ta c th c ton b khi d liu. Nukhng th len s cha gi tr -1 v d liu phi c c tng k t mt cho n khi gpnh du cui file (-1). Phng thc processData() v processBuffer() x l d liu nt server. Khi lnh cui cng s ng tt c cc kt ni khng quan tm n c li tkhi lnh try trc hay khng.

4.2.3.2. V d kt ni HTTP POST

HTTP POST cho php gi d liu n server. D liu gi n server qua phngthc GET ch gii hn l d liu cha a ch URL. Phng thc POST cho php gi mt

lung byte n server. Phng thc HTTP POST thc hin theo cch tng t vi

phng thc HTTP GET.

V d thc hin mt kt ni HTTP POST:void postViaHttpConnection(String url) throws IOException {HttpConnection c = null; InputStream is = null;OutputStream os;

try {c = (HttpConnection)Connector.open(url); // M kt ni// Thit lp phng thc POST// trong khi vn trng thi Thit lpc.setRequestMethod(HttpConnection.POST);// M lung output stream v chuyn sang trng thi Kt nios = c.openOutputStream();// Chuyn i d liu thnh lung byte// v gi n server

os.write(Data Sent to Server\n.getBytes());int status = c.getResponseCode();// Kim tra statusif (status != HttpConnection.HTTP_OK)

throw new IOException(not OK);int len = (int)c.getLength();

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4.2.5. HTTP Request Header

HTTP request header phi c thit lp trng thi Thit lp bng phng thc

setRequestMethod() v setRequestProperty(). Phng thc setRequestMethod() dng

thit lp cc phng thc GET, POST, hoc HEAD.

Phng thc setRequestProperty() dng thit lp cc trng trong request header.

V d c th l Accept-Language, If-Modified-Since, User-Agent.

Phng thc getRequestMethod() v getRequestProperty() c th c dng ly

cc thuc tnh trn.

4.3. Wireless Messaging API

J2ME cha hu ht cc cu hnh v hin trng, kt hp vi nhau nh ngha mi

trng thc thi Java hon chnh cho cc thit b c ti nguyn gii hn. Tuy nhin, i

khi, cn phi c gi giao din lp trnh ng dng (Application Programming Interface

API), c th chi x bi cc ng dng chy trn cc hin trng khc nhau. J2ME nh

ngha API nh vy l cc gi ty chn (optional package), l mt tp cc lp v cc ti

nguyn khc c th c dng kt hp vi hin trng.

Cng ging nh cc thnh phn ca J2ME, cc gi ty chn c nh ngha l yu

cu c t Java (Java Specification Request JSR) thng qua Java Community Process.Mt trong nhng gi ty chn u tin cho J2ME l JSR 120, b API nhn tin khng dy

(Wireless Messaging API WMA), dng gi v nhn cc tin nhn vn bn hoc nh

phn ngn trn kt ni khng dy. WMA da trn khung kt ni mng tng qut (GCF).

Cc tin nhn c gi v nhn vi WMA c gi trn cc mng khng dy ca

in thoi di ng v cc thit b tng t khc, c th l GSM hay CDMA. WMA h tr

Short Message Service (SMS) v Cell Broadcast Short Message Service (CBS). Mc d

tin nhn WMA tng t nh datagram, WMA khng s dng giao din datagram c

nh ngha bi GCF, giao din ny dng cho kt ni UDP. Thay vo , WMA nh ngha

mt tp giao din mi trong gi java.wireless.messaging.

gi hoc nhn tin nhn, ng dng trc ht phi to mt instance ca giao din

MessageConnection, s dng GCF connection factory. a ch URL chuyn cho phng

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public void sendText( MessageConnection conn, String text )throws IOException, InterruptedIOException {

TextMessage msg = conn.newMessage( conn.TEXT_MESSAGE );msg.setPayloadText( text );conn.send( msg );

}Gi d liu nh phn cng hon ton tng t:

public void sendBinary( MessageConnection conn, byte[] data )throws IOException, InterruptedIOException {

BinaryMessage msg =conn.newMessage( conn.BINARY_MESSAGE );

msg.setPayloadData( data );conn.send( msg );

}

D nhin, c gii hn lng d liu c th gi trong mt tin nhn. Thng thng, tin

nhn vn bn SMS b gii hn n 160 hoc 70 k t, tin nhn nh phn b gii hn n

140 bytes.

Nhn tin nhn thm ch cn n gin hn: Sau khi m mt kt ni server, ng dng

gi phng thc receive() ca kt ni, phng thc ny s tr v tin nhn c trong cng

xc nh. Nu khng c tin nhn, phng thc s ng (block) cho n khi c tinnhn, hoc cho n khi c mt thread khc ng kt ni:

import java.io.*;import java.microedition.io.*;import java.wireless.messaging.*;

MessageConnection conn = null;String url = "sms://:5678"; // khng c s in thoi!

try {conn = (MessageConnection) Connector.open( url );while( true ){

Message msg = conn.receive(); // blocksif( msg instanceof BinaryMessage ){

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Chng 5. Xy dng ng dng th nghim

5.1. Gii thiu ng dng5.1.1. Mc tiu

Xy dng mt ng dng trn thit b di ng nhm tr gip ngi dng cp nht

cc thng tin m ngi dng quan tm thng qua cc thng tin xut bn trn Web

Services.

Bng phng php ny, ngi dng s c c cc thng tin chn lc nht m h

khng phi tn thi gian ngi lt web, thay vo , h c th i n bt c u ch vi

thit b di ng nh gn trong tay l c th cp nht thng tin h quan tm.5.1.2. ng dng th nghim

Chng trnh ng dng c vit bng ngn ng J2ME phc v thit b di ng ca

ngi dng c h tr dng ngn ng ny.

Pha dch v cung cp ni dung c xy dng trn ngn ng PHP v c s d

liu mySQL.

Ni dung c web-services tr v theo chun XML v c ng dng chy trn

thit b di ng phn tch, x l v hin th trn mn hnh.

5.2. Cc cng ngh s dng trong chng trnh

5.2.1. Lightweight UI Toolkit (LWUIT)

LWUIT l mt th vin nh da trn Swing nhng c thit k cho cc thit b

mang tnh cht nh gn. LWUIT h tr giao din mt cch linh hot v mnh m, vi cc

thnh phn v cc lp phn tng ring bit.

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Hnh 17: Cc phn tng lp trong LWUIT.

Vi b th vin nh gn ny, ngi lp trnh s c mt phng thc ring tng

tc v lm vic vi mi trng MIDP trn thit b di ng.

V d hin th Hello world

import com.sun.lwuit.Display;import com.sun.lwuit.Form;import com.sun.lwuit.Label;import com.sun.lwuit.layouts.BorderLayout;import com.sun.lwuit.plaf.UIManager;

import com.sun.lwuit.util.Resources;

public class HelloMidlet extends javax.microedition.midlet.MIDlet {public void startApp() {

Display.init(this);try {

Resources r = Resources.open("/LWUIT.res");UIManager.getInstance().setThemeProps(r.getTheme(

r.getThemeResourceNames()[0]));

} catch (java.io.IOException e) {}Form f = new Form();f.setTitle("Hello World");

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o Tt cc cc thuc tnh bt buc nh ngha trong DTD phi c mt.

o Gi tr thuc tnh phi nm trong du nhy.

o Cc th cha v c cha phi theo st DTD, hay Schema.o Cc k t markup nh < hay & khng c ng mt mnh. Nu cn, chng phi

c dng l &lt, &amp,

o Tt c cc th rng phi kt thc bng />

Chc nng ca b phn tch l kim tra cc lut trn.

Da vo cc loi ti liu XML m ta cp trn, c hai loi b phn tch XML,mt loi phn tch ti liu XML kim tra hp l v b kia phn tch ti liu XML khngkim tra hp l.

B phn tch khng kim tra hp l (Nonvalidating parser): B phn

tch ny ch kim tra ti liu c ng ng php hay khng; ni cch khc, b phn tch ch

thc hin kim tra c php ca DTD trong ti liu, l l do ti sao n c gi l b

phn tch khng kim tra hp l.

B phn tch kim tra hp l (Validating parser): Cc b phn tch ny

bin dch DTD v theo cc khai bo th pht sinh output dng ngi dng c th c

c. J2ME khng th h tr kim tra hp l ti liu XML.

Ngoi ra c th phn loi theo cch tip cn. C hai cch tip cn cho vic x lXML: SAX v DOM. SAX hay Simple API for XML l mt khung (framework) hng s

kin, b phn tch s gi cc back function trong m chng trnh client khi x l tp tin

XML. SAX nh, v m hnh hng s kin ca n lm gim b nh cn thit lm cho n

thch hp vi cc ng dng nh. Tuy nhin, n chim mt phn ln trong m chng

trnh client theo di cy phn tch XML. Khc vi SAX, DOM hay Document Object

Modela ra cch nhn theo cy gn vi m hnh i tng nhng yu cu tiu tn nhiu

b nh hn. Mt cy DOM c th d dng c duyt qua s dng mi lin h cha-con.

5.2.2.2. Cc b phn tch XML cho KVM

C nhiu loi b phn tch cho KVM. Cc b phn tch a ra y lm vic vi

KVM. Ta s ch ni v tnh nng chnh ca cc b phn tch.

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o Pull parser: cc b phn tch ny, u tin d liu c c v n c phn

tch t nh ngha. Vic phn tch c th hon thnh bng cc hm qui dch cu trc

cy ca ti liu.o Push parser: Cc b phn tch ny x l nh ngha d liu trc khi x l ti

liu. Cu trc cy hon chnh c to trong b nh trc khi tht s bt u x l ti liu

XML. Trong trng hp ny, ton b cy DOM c sinh ra trong b nh ngay c khi

khng cn thit phi nh vy.

5.2.2.2.1. kXML

y l b phn tch XML quan trng v ph bin nht cho KVM. N l kt hp ca

pull parser v XML Writer, c dng vit XML. N cha mt WAP Binary XML(WBXML) c dng chuyn ti liu XML trn cc knh truyn thng v tuyn. Do

, n h tr Wireless Markup Language. N cha mt kDOM c bit, l Document

Object Model thay cho kXML. N n gin hn v qun l khng gian hiu qu hn

Document Object Model. N bin dch v lm vic vi mi trng Thit b thng tin di

ng (Mobile Information Device-MID) m khng cn phi hiu chnh. N nm trong gi

de.kxml. Chc nng ca n c nh ngha trong lp Parser.

5.2.2.2.2. Tiny XML

y l mt push parser khng kim tra hp l, bin dch ton b cy DOM vo b

nh v sau phn tch ton b ti liu XML. N cn phi hiu chnh m ngun chy

trn MID. c im chnh ca TinyXML l n ch theo mt s b m xc nh: ASCII,

UTF-16, UTF-16BE, v UTF-8. Kiu b m c xc nh trong XML Prolog. Nu kiu

b m XML Prolog khng phi l b m ASCII, UTF-16, UTF-16EB v UTF-8, th

TinyXML s khng phn tch ti liu XML v s nm ra mt ngoi l.

5.2.2.2.3. Nano XML

y l mt b phn tch khc cho KVM, n hot ng theo kiu push-parsing. Nc mt tnh nng ring cho vic hiu chnh ti liu v vit ti liu tr vo stream. Bi v

tnh nng ny khng c ch lm cho MID, b phn tch ny khng c dng nhiu. Tuy

nhin, mt khi tnh nng ny c chp nhn trong c t MID, n s l mt b phn tch

quan trng cho truyn thng v tuyn.

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5.2.2.3. Lm vic vi kXML

Ta chn s dng b phn tch kXML. Ta s kho st cch lm vic vi kXML.

Cc lp v gi trong b phn tch kXML:

Lp Attribute: Lp ny th hin thuc tnh ca th. Khi ta gi phng thc

StartTag.getAttribute, n s tr v mt i tng c kiu l Attribute l thuc tnh ca th

. Lp ny c bn phng thc. Phng thc getName() tr v tn ca thuc tnh, ta

cng c th ly gi tr ca thuc tnh bng cch gi phng thc getValue() ca n.

Phng thc toString() s tr v dng biu din chui ca i tng Attribute.

Lp XML: Lp ny biu din d liu XML. Lp ny c dng bi b

phn tch. Tt c cc phng thc trong lp ny u l tnh (static). N c mt s trng b phn tch s dng, v d nh START-TAG, TEXT, END-TAG,...

Lp PrefixMap: Lp ny biu din PrefixMap ca th. Khi bn gi

phng thc StartTag.getPrefixMap(), n s tr v mt i tng PrefixMap. Lp ny c

ba phng thc: phng thc getNamespace(), tr v namespace ca prefix ny, phng

thc getPrefix(), tr v chui biu din ca prefix, v phng thc PrefixEnumeration().

5.2.2.4. Gi org.kxml

Gi ny cha cc lp lin quan n vic phn tch d liu XML.AbstractXMLParser: y l mt lp tru tng (abstract class). Tt c cc lp phn

tch XML u k tha lp ny. bt u phn tch d liu, ta phi gi phng thcread() ca lp ny. Phng thc ny pht sinh mt i tng ca lp ParseEvent. Tt ccc phng thc khc s c b phn tch s dng.

XmlParser: Lp ny k tha lp AbstractXmlParser. Hm to ca lp ny

cn mt i tng lp reader, t n bt u c d liu XML v trong khi phn tch d

liu, ng thi n s pht sinh cc s kin phn tch (parse event). Lp ny k tha tt c

cc phng thc ca lp AbstractXmlParser.

Lp ParseEvent: y l mt lp tru tng, th hin cc s kin c

pht sinh bi b phn tch trong lc phn tch d liu XML.

Lp StartTag: Lp ny k tha lp ParseEvent. i tng ca lp ny

c pht sinh khi b phn tch tm thy bt u ca mt th v d:

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Nhng module quan trng ca h thng c t trong mt th mc chnh, di y

l cc module v th mc cha nhng module quan trng trong vic x l logic ca h

thng:

index.php: y l u vo khi u, v duy nht ca ng dng. y, cc

bin h thng, bo mt c nh ngha, cng t y s triu gi n cc gi h tr cu

hnh bin cn thit trong qu trnh h thng x l.

ajax: y l th mc cha ton b cc module trong qu trnh x l ca h

thng vi kiu lm vic ajax, trong th mc ny, c chia lm hai phn tch bit cho ng

dng vi admin hoc bn ngoi cho ngi dng hoc khch.

route.php: y l ni iu hng ca ng dng, t y s xc nh xem khu

vc ng dng no c triu gi, ca admin hay bn ngoi trang.

admin.layout.php: giao din chun ca ng dng cho admin.

site.layout.php: giao din bn ngoi trang.

config.php: nh ngha cc thng s chung c dng trong ton b ng

dng.

admin: th mc x l ring bit nu ngi dng mun truy xut vo phn

ng dng dnh cho admin th phi qua bc kim tra hp l vi ti khon admin.

help: th mc cha cc module tr gip trong qu trnh lm vic ca h

thng.

languages: th mc nh ngha ngn ng s dng trong h thng, v nu l

h tr a ngn ng. Hoc khng s s dng ngn ng mc nh l Ting Anh.

controller: th mc iu hng chnh trong qu trnh x l MVC, trong th

mc ny c tch bit gia hai trng thi ngi s dng l admin v bn ngoi trang.

model: th mc cha cc truy vn v c s d liu ni chung trong qu

trnh h thng x l theo kiu MVC.

class: nh ngha cc lp hay dng trong qu trnh x l ca h thng. js: th mc cha cc file javascript c dng trong h thng.

template: th mc cha cc file css xy dng giao din dng trong h

thng.

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6.1.2. Xy dng c s d liu cho h thng

C s d liu dng trong h thng gm 8 bng:

tbl_usertbl_user_

grouptbl_

layouttbl_

languagetbl_

component

tbl_componen

t_group

tbl_category_content

tbl_conten

idusernamepasswordemail

firstNamelastNamemiddleNamegenderdobjoinTimelastLoginTimelastLoginIp

statusgroupId

idgroupNa-medescriptio-

n

idnameversioncreatedTime

descriptionauthorNameauthorEmailauthorOrgauthorUrlencodingmetaTitlemetaKeywordmetaDescription

applied


descriptionauthorNameauthorEmailauthorUrlauthorOrgapplied


descriptionauthorNameauthorEmailauthorUrlauthorOrgeditableactiontaskcontrollerordering

statusgroupId

idnameorderingstatus

idparent_idnamelink

orderingseo_namewooden_legpublish

idcreatedDteordering

statustitledescriptncontentsourcecat_id

V biu thc th lin kt:

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Hnh 21: Ngi qun tr ng nhp vo h thng.6.1.3.1.2. Khu vc chung

Ngi qun tr c th lm mi ni dung a xung thit b di ng, mi danh mc

s c h thng la chn 10 bn ghi mi nht.

Hnh 22: Khu vc mc nh ca h thng

6.1.3.1.3. Khu vc thao tc vi cc danh mc tin

Ngi qun tr c th to mi, sa, xa cc danh mc tin. Cc danh mc c th to

a cp, cp cao nht thuc cp con ca root

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Hnh 23: Khu vc hin th danh mc ca h thng.

6.1.3.1.4. Khu vc qun l ni dungNgi qun tr c th thao tc vi cc bn ghi ca tng danh mc lin quan, cc

quyn c bn nh to, sa, xa, chuyn trng thi (publish, unpublish)

Hnh 24: Khu vc hin th ni dung bn tin.

6.1.3.2. Phn dnh cho ngi qun tr

Phn ny dnh cho ngi qun tr cp cao nht l super admin.

6.1.3.2.1. Phn menu bn tri

y l phn dng truy xut n tt c cc chc nng trong h thng, nh qun

tr c th tng tc vi cc chc nng lin quan nh nhm ngi dng (users group),

nhm thc n (menus group), thnh phn (components), ngn ng (languages).

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Hnh di minh ha phn ty chn bn tri:

Hnh 25: Phn ty chn bn tri ca h thng.

6.1.3.2.2. Phn qun l nhm ngi dng

Ngi dng root (super administrator) c th to ra nhng ngi dng khc vi cc

nhm nh: administrator, moderator, member ty vo tng ng cnh ca h thng v ng

dng.

Hnh 26: Phn qun l nhm ngi dng.

6.1.3.2.3. Phn qun l nhm thc n

Super administrator c th to ra cc thc n vi tn khc nhau dng gom nhm

cc thnh phn vi nhau. V d: Category v Content di thc n l Content

Manager.

Hnh 27: Phn qun l nhm thc n.

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Hnh 31: Kt qu thu c vi trnh duyt Mozilla Firefox 3.5.

6.2. Trn thit b di ng

6.2.1. Quy trnh hot ngMn hnh khi ng ng dng

Hnh 32: Mn hnh khi ng ca ng dng

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Tip ngi dng s vo phn ty chn ng dng

Hnh 33: Mn hnh ty chn ng dng.

Cu hi yu cu cho php kt ni vi dch v mng?

Hnh 34: Yu cu cho php kt ni ti dch v.

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Sau l cc thng tin chi tit hn

Hnh 35: Cc qu trnh khi xem tin tc vi ng dng.

6.3. Cc module chnh trong ng dng

6.3.1. Web Services

C rt nhiu gi tin lin quan trong ng dng web services ny, trong khun kh ti

liu ch gii thiu cc module in hnh:

Default component: y l component mc nh ca h thng khi cc bin iu

khin cha c xc lp. y cng l component bt buc phi c ci t h thng

c th hot ng. Khu vc iu khin c t trong th mc /controller/site/default:

default.index.php: file iu hng chnh ca component.

template: th mc cha giao din html.

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display.tpl.php: file cha giao din html.

view: th mc cha file x l d liu v xut bn ni dung.

view.php: file x l.

js: th mc cha file javascript ca component.default.site.js: file mc nh bt buc cha m javascipt ca component.

tng tc vi c s d liu, chc nng model ca m hnh MVC trong componentc t th mc /model/site/default:

defaultdefault.model.php: file tng tc vi c s d liu.

default.index.php:

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(3). Dng lnh dng trnh truy cp trc tip file php.(4). Thit lp cc bin cc b ca h thng.

(5). Gi module x l logic ca component.(6). Khi to i tng.(7). Thit lp Title ca trang HTML trn trnh duyt.(8)(22). X l iu hng ca component.

view.php:(2). Khi to lp CDefault

(15). Truyn gi tr ca bin xung template.(16). Gi module x l xut bn html.

display.tpl.php:1.

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default.model.php:

do logic ca component ny khng yu cu nn hai file ny khng cha ni dung x l.

6.3.2. Trn thit b di ng

Th mc /src cha cc module .java ca chng trnh:

src

com

sun

lwuit: th mc cha m ngun ca th vin lwuit dng tp tin.

newsonline

news: th mc cha cc gi .java hot ng chng trnh.

util: th mc cha cc gi th vin h tr.NewsOnlineMIDlet.java: file gc ca chng trnh.

Th mc /res cha cc ngun media:

res

images: cha cc nh .png.Th mc /lib cha cc gi th vin h tr:

lib: cha cc gi h tr kxlm2.zip, LWUIT.jar.

Cn nhng th mc khc l do trnh bin dch khi to project bn trong netbean.NewsOnlineMIDlet.java:

1. package newsonline;2. import com.sun.lwuit.Command;3. import com.sun.lwuit.Display;

4. import com.sun.lwuit.Form;5. import com.sun.lwuit.List;6. import com.sun.lwuit.animations.CommonTransitions;7. import com.sun.lwuit.animations.Transition;8. import com.sun.lwuit.events.ActionEvent;

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9. import com.sun.lwuit.events.ActionListener;10.import com.sun.lwuit.layouts.BorderLayout;

11.import com.sun.lwuit.list.DefaultListCellRenderer;12.import com.sun.lwuit.list.DefaultListModel;13.import com.sun.lwuit.plaf.UIManager;14.import com.sun.lwuit.util.Resources;15.import java.io.IOException;16.import javax.microedition.midlet.*;17.import newsonline.news.ConfirmExit;18.import newsonline.news.HelpContact;19.import newsonline.news.News;

20.public class NewsOnlineMIDlet extends MIDlet implements ActionListener {21.private static final Command selectCommand = new Command("Chn", 0);22.private static final Command exitCommand = new Command("Thot", 1);23.public static Form mainForm;24.private static List listMemu;25.public void startApp() {26.// VKBImplementationFactory.init();// Tao ban phim ao cho cac dong may

cam ung27.Display.init(this);

28.try {29.Resources res = Resources.open("/newsonlineresources.res");30.UIManager.getInstance().setThemeProps(res.getTheme(res.getThemeResourceNa

mes()[0]));31.mainForm = new Form("Tin Tc");32.mainForm.setLayout(new BorderLayout());33.//disable the scroll on the Form.34.mainForm.setScrollable(false);35.String[] menu = {"Tin Tc","Tr Gip", "Lin H"};

36.DefaultListModel dlModel = new DefaultListModel(menu);37.listMemu = new List(dlModel);38.//create a ListCellRenderer and install39.DefaultListCellRenderer dlcr = new DefaultListCellRenderer();40.listMemu.setListCellRenderer(dlcr);41.// dlcr.setShowNumbers(false);

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42.listMemu.setFixedSelection(List.FIXED_NONE_CYCLIC);// Cho phep selectvong tron

43.listMemu.setSmoothScrolling(false);44.listMemu.getStyle().setBgTransparency(0);45.listMemu.addActionListener(new ActionListener() {46.public void actionPerformed(ActionEvent ae) {47.Transition out;48.out =

CommonTransitions.createSlide(CommonTransitions.SLIDE_HORIZONTAL,false, 500);

49.setTransition(null, out);

50.switch (listMemu.getSelectedIndex()) {51.case 0:52.if (News.listNewsCategory != null) {53.News.newsForm.show();54.} else {55.new News(mainForm);56.}57.break;58.case 1:

59.new HelpContact(mainForm, "Tr Gip", "Dng phm ln, xung v OK chn\nhoc c th dng phm select v cancel\n");//

60.break;61.case 2:62.new HelpContact(mainForm, "Lin H", "Lin h 19001234 c gii p");63.break;64.}65.}66.});

67.mainForm.addComponent(BorderLayout.CENTER, listMemu);68.mainForm.addCommand(selectCommand);69.mainForm.addCommand(exitCommand);70.mainForm.setCommandListener(this);71.mainForm.show();72.} catch (IOException ioex) {

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73.ioex.printStackTrace();74.}

75.}76.public static void setTransition(Transition in, Transition out) {77.mainForm.setTransitionInAnimator(in);78.mainForm.setTransitionOutAnimator(out);79.}80.public static Resources getResource(String name) throws IOException {81.return Resources.open("/" + name + ".res");82.}83.public void pauseApp() {

84.}85.public void destroyApp(boolean unconditional) {86.notifyDestroyed();87.}88.public void actionPerformed(ActionEvent ae) {89.Command cmd = ae.getCommand();90.switch (cmd.getId()) {91.case 0:92.Transition out;

93.out =CommonTransitions.createSlide(CommonTransitions.SLIDE_HORIZONTAL,false, 500);

94.setTransition(null, out);95.switch (listMemu.getSelectedIndex()) {96.case 0:97.if (News.listNewsCategory != null) {98.News.newsForm.show();99.} else {

100. new News(mainForm);101. }102. break;103. case 1:104. new HelpContact(mainForm, "Tr Gip","Dng phm ln, xung v OK

chn\nhoc c th dng phm select v cancel\n");//

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Chng 7. Ci t ng dng th nghim

7.1. Web Services7.1.1. Ci t phn gi lp my ch Web trn my tnh c nhn

gi lp my ch web trn PC c rt nhiu phn mm, tnh nng tng hp

c ch cao nht cho cc phn mm ci t c 3 b tin ch l php, mySql v

phpmyAdmin. Wamp l mt phn mm vi giao din n gin, d s dng v hi t

cc iu kin trn. Tin hnh ci t gi Wamp 1.5 nh km trong a chng trnh, ci

t theo thng s mc nh ca phn mm.

Cui cng thu c cc cu hnh c bn:Hosting url: localhost

User name: root

Password:

7.1.2. Cu hnh gi ng dng Web Services

Sau khi ci t chng trnh gi lp, tin hnh ci t c s d liu, truy cp vo a

ch: http://localhost/phpmyadmin/

Hnh 36: To c s d liu trong phpmyadmin.

Nhp tn c s d liu v to.

Tip tin hnh import c s d liu c sn c nh km trong a chng trnh

Hnh 37: Qu trnh nhp c s d liu.

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Sau copy ton b th mc /services c nh km trong a chng trnh vo

th mc /www ca chng trnh wamp.

Trong th mc /services, m file config.php ch edit (n gin c th dng

notepad sa), thay vo cc tham s ph hp theo th t: dbHost, dbUser, dbPass,

dbName:

$ar = array( "localhost", "root", "", "services" );

Nh vy l hon tt qu trnh ci t, truy cp ng dng web services ti a ch:

http://localhost/services

Ti khon administrator mc nh ban u l admin/abc123.

7.2. Trn thit b di ng

7.2.1. Ci t phn mm m phng

o netbeans-6.7.1: y l IDE xy dng ng dng J2ME mc c bn.o sun_java_wireless_toolkit-2.5.2_01: y l trnh bin dch m java v to m hnh

m phng thit b di ng trn my tnh.

Hai gi ny u c nh km theo a chng trnh.

7.2.2 . Cu hnh ng dng th nghimTrong netbean IDE to New Project hoc nhn Ctrl+Shift+N.

Hnh 38: Bc u to Project mi.

Chn Mobile Application, ri Next.

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Hnh 39: Cu hnh ban u.

Project Name: la chn mt tn bt k, b chn Create Hello MIDlet, ri Next.

Hnh 40: Cu hnh chi tit.

ty chn Emulator Platform chn Sun Java( TM ) Wireless Toolkit 2.5.2_01 for

CLDC ri Finish.

Copy ton b th mc /News nh km theo a chng trnh vo th mc to

project ca netbean, /My Documents/NetBeansProjects/News.

Nh vy vic cu hnh ng dng hon tt, tip theo tin hnh Clean & Build v

chy chng trnh m phng.

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Kt lun

Kha lun c chia lm by chng mc v tp trung vo hai iu chnh, th nht,lm r l thuyt, tip cn cng ngh J2ME v cc cng ngh h tr mt cch tng qut,

ng b nht. Th hai, nghin cu v th nghim ng dng vit trn J2ME v tng tc

vi Web Services dng giao thc XML.

Chng mt, cung cp mt ci nhn s b nht v cng ngh lp trnh trn di ng

ni chung, v cc cng ngh ph bin nht hin nay ni ring. Cng trong chng ny, ta

c ci nhn mang tnh xu hng v tng lai ca ngnh cng nghip lp trnh trn di

ng.

Chng hai, gii thiu cng ngh lp trnh trn thit b di ng vi ngn ng J2ME.

Mt cch tng qut nht v ngn ng J2ME, cc c im ca ngn ng ny v s so

snh mt s c im ca ngn ng J2ME v anh em ca n l J2SE.

Chng ba, cung cp cho ngi c ci nhn r hn v bn cht ca cng ngh lp

trnh vi ngn ng J2ME. Tuy vy, y l kin thc mang bn cht cng ngh, n khng

phc v trong vic lp trnh nhiu lm m n gip nhng ngi pht trin hiu c bn

cht mt cch cn k nht v nhng vic h lm khi thc hin cc project trong trin khai

ng dng.

Chng bn, i su vo mt s cng ngh trong lp trnh vi ngn ng J2ME. y

l nhng cng ngh c th v chi tit trong ngn ng J2ME. Chng ny gip ngi

lp trnh mt cch trc tip v mnh m nht.

Chng nm, sau khi c ci nhn v hiu bit tng i v cng ngh lp trnh trn

thit b di ng vi ngn ng lp trnh J2ME, chng ny s dn dt ngi c v ng

dng th nghim c th. Ngoi ra, n cn gii thiu cc cng ngh lin quan dng trong

chng trnh ng dng th nghim. y l nhng cng ngh ph bin bn ngoi, hinang c cng ng s dng v h tr mnh m.

Chng 6, gii thiu ng dng th nghim. ng dng c chia thnh hai phn

chnh nu xt v phng din chc nng v phn chia i tng s dng. Th nht, l

phn Web Services, phn ny dng ring cho nhng ngi qun tr ni dung. N cung cp

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cc chc nng ngi qun tr thao tc qun l ni dung a xung thit b di ng

ca ngi dng

Chng by, y l chng cui cng, chng ny gip ngi c ci t v cu

hnh thnh cng ng dng th nghim.

Nh vy, kha lun tp trung lm r c cng ngh lp trnh J2ME v xy dng

c ng dng th nghim. l thnh qu ca mt qu trnh n lc c gng trong vic

nghin cu l thuyt cng nh lp trnh ng dng th nghim, n l kt qu ca mt qu

trnh va hc va lm v va lm va hc. Tuy thnh tu t c l khng nh nhng

do khun kh thi gian cng nh kh nng cn hn ch nn vn c nhng thiu st cha

c khc phc Nu c thun li v thi gian v nhn lc th ng dng demo ny honton c th em ra phc v thc t. t nht phn Web Services cn c b xung chc

nng Web Crawler gii phng sc ngi trong vic qun l v xut bn ni dung, bn

cnh cng cn b sung cc chc nng cao cp hn trong phn qun tr ca super

administrator.

hon thnh ni dung ca kha lun ny c bit chng ba, chng bn th c

phn ng gp khng nh ca nhng blogger v J2ME [9], [10] ngoi nhng c nhn

nu phn u. Mt ln na xin chn thnh cm n nhng ngi v s pht trin chung

ca cng ngh, v tnh yu i vi khoa hc, h ng gp rt ln cho nhng ngi isau trong vic tip cn tri thc mt cch nhanh chng v c h thng. Vic k tha v

pht trin tip kin thc hn lm lm nn mt th gii mang tnh cng ng rt cao. Tt c

bt ngun t tnh yu i vi T quc, tnh yu , s chia s v mong mun cng tin b

trong khoa hc k thut.

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Ti liu tham kho

Ti liu ting Anh:

[1] Andi Gutmans, Stig Sther Bakken, and Derick Rethans, PHP 5 Power

Programming, 2004

[2] Anura Guruge, Corporate Portals Empowered with XML and Web Services,

Publisher Digital Press, October 15, 2002

[3] Biswajit Sarkar, Packt - LWUIT 1.1 for Java ME Developers, 2009

[4] BrianPfaffenberger, StevenM.Schafer, CharlesWhite, BillKarow, HTML,XHTML, & CSS Bible, 3rd Edition, 2004

[5] Ethan Cerami, Web Services Essentials, 2/2002

[6] Kim Topley, J2ME in a Nutshell, Edition March 2002

[7] Robert Hablutzel, Developing Web Services with Java APIs for XML, 2005

Ti liu ting Vit:

[8] Lp trnh J2ME c bn, Nguyn Ngc Minh, javavietnam.orgWebsite tham kho:

[9] http://khanhlnq-blog.posterous.com/bai-1-khai-quat-cac-lop-j2me

[10] http://www.javavietnam.org/