蒋健

图解 Java EE 6

GlassFish V3 OnePager 阅读心得分享

Java 企业应用进入 Java EE 时代

Java 企业应用GlassFish 是前沿阵地上的排头兵

• GlassFish v1/v2 -> Java EE 5• GlassFish v3(V3 Prelude) -> Java EE

6Tomcat

2005.6 2006.5

GlassFish启动v2v1 v3

2007.9 2009.6

UR1

v2.1UR2

V3 Prelude

2008.11 2008.12

Java EE5 Java EE6

Java EE 规范和GlassFish

GlassFish V3 One Pager• Overview and Infrastructure

– HK2, OSGi, Grizzly, Admin infrastructure, Logging, File Layout, Extensibility, Embedded Server, L10n

• Containers and Core Services– Naming and Injection Manager, Resource, Security, Transaction

Service ， Scripting, Web, EJB , Metro, Web Service Integration, Jersey Integration, Java EE Service Engine

• Management and Monitoring– Command Line, Admin Console, Monitoring, AMX, MBean

Annotation Library…

• http://wiki.glassfish.java.net/Wiki.jsp?page=V3FunctionalSpecs

开源所开放的不只是源代码。。。

Servlet 3.0 • Ease of development• Pluggability

– <web-fragment> • asynchronous support

– Server push

@WebServlet(name="mytest",  urlPatterns={"/myurl"}, initParams={ @InitParam(name="n1", value="v1") })

public class TestServlet extends HttpServlet { .... }

NIO Server• Why NIO Server?

– 解决了 Java-based Server的性能问题– Thread, Request, Connection的新玩法

• Grizzly的新进展– 主外也主内的灰熊– 前置于Web Container– Atmosphere ： Comet Framework– GrizzlyAdapter

• ServletAdapter,CometAdapter,OSGiMainAdapter

Servlet 3.0 老树发新芽

J2EE without EJB …• Complexity• Entity bean• Less portable• Scalability• No Singleton

• 类 Java Bean的轻量级开发• JPA• 所有主流厂家基于标准的一致支持• 集群，走向成熟• 3.1支持 Singleton

Java EE without EJB 3?•轻量级的开发

– Annotation，支持 DI– 没有部署描述符

• 让 EJB容器来遮风避雨– 可移植性，事务，安全，性能优化– 管理和监控

• EJB 3.1– EJB with Restful– War的形式部署– No interface

将 iphone仅仅用作mp3?

JSF • JSF in JEE 6

– Ajax– composite components

• JSF in GlassFish– Mojarra - JSF 2.0 RI– JSFTemplate– FaceTester

<h:outputScript name="ajax.js" library="javax.faces" target="head"/> …<h:commandButton id="button1" value="Count"

onclick="javax.faces.Ajax.ajaxRequest(this, event, {execute: this.id, render: 'out1'}); return false;"/>

JSF- 封装服务器端和客户端的风景

Restful - JSR311• Restful in JEE 6

– 更轻量的Web Service– URI表示可对其执行确定操作的资源– 和EJB 3.1的结合

• Restful in GlassFish– Jersey是Rest风格的T恤衫– Restful + JMX用于monitoring

@Stateless@Path("ssb") public class HelloWorldEJB {     @GET     public String hello() {         return “Hello World!" ;     } }

Client client = Client.create(); WebResource webResource =

client.resource("http://localhost:8080/helloapp/resources/ssb");

String result = webResource.get(String.class);

将 Session Bean发布成 RestFul的资源 通过 Jersey在客户端访问 URI

OSGi• OSGi in JEE6

– 为多数 App Server所采用– 模块化 (design time)，物理层面上定义依赖– 动态化 (runtime)，热插拔，多版本…

• OSGi in GlassFish– 不一样的 HK2– 所有模块都以 OSGi Bundle的形式提供， update center– 直接部署 OSGi bundleasadmin deploy --type osgi simple-service-api.jar

telnet localhost 6666 Trying 127.0.0.1...Connected to localhost. Escape character is '^]'.Felix Remote Shell Console:

OSGi 的效果图 ( 未必适合每个人的口味 )

JMX

• JMX in JEE 6–为应用贴上条码–轻量级的标准统一的管理接口– @MBean, @MXBean

• JMX in GlassFish– AMX (Appserver Management eXtensions) – GMBAL(GlassFish MBean Annotation Library)

• @ManagedObject – JMX+Rest

GlassFish V3的管理界面

JEE 6的主题和“秘技”• Annotation• Restful• NIO Server• OSGi

Rightsizing =Flexibility, Focus, Simplification

社区因人而生动

谢谢大家 !

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家常咖啡http://blogs.sun.com/jiangjian