Курс java-2016. Занятие 11. servlets, jsp

Курс по Java, 2016

Servlet, JSP

Курс по Java, 2016

Servlet API

Курс по Java, 2016

javax.servlet.Servletimport javax.servlet.GenericServlet;

public class MyServlet extends GenericServlet { @Override public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException { // do something }}

Курс по Java, 2016

javax.servlet.ServletRequestString remoteAddress = servletRequest.getRemoteAddr();String contentType = servletRequest.getContentType();InputStream input = servletRequest.getInputStream();String parameter = servletRequest.getParameter("name");Object attribute = servletRequest.getAttribute("name");servletRequest.setAttribute("name", attribute);

Курс по Java, 2016

javax.servlet.ServletResponseservletResponse.setContentType("text/html");servletResponse.setContentLength(256);OutputStream output = servletResponse.getOutputStream();

Курс по Java, 2016

javax.servlet.http.HttpServletpublic class MyHttpServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // process GET request } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // process POST request } }

Курс по Java, 2016

javax.servlet.http.HttpServletRequestString remoteAddress = request.getRemoteAddr();String contentType = request.getContentType();Reader reader = request.getReader();String parameter = request.getParameter("name");Object attribute = request.getAttribute("name");request.setAttribute("name", attribute);Cookie[] cookies = request.getCookies();String proxiedClient = request.getHeader("X-Forwarded-For");HttpSession session = request.getSession();

Курс по Java, 2016

javax.servlet.http.HttpSessionHttpSession session = request.getSession();

Object sessionAttribute = session.getAttribute("name");session.setAttribute("name", sessionAttribute);

Курс по Java, 2016

javax.servlet.http.HttpServletResponseresponse.setContentType("text/html");response.setContentLength(256);Writer writer = response.getWriter();response.addCookie(new Cookie("name", "value"));response.addHeader("X-My-Header", "value");response.sendError(500, "Everything failed");response.sendRedirect("/other-path");

Курс по Java, 2016

Servlet Container

Курс по Java, 2016

Apache TomcatСамый популярный Servlet/JSP контейнерhttps://tomcat.apache.org/

Курс по Java, 2016

$CATALINA_HOME├── bin├── conf├── lib├── logs├── webapps│ ├── hello│ │ ├── index.jsp│ │ ├── META-INF│ │ └── WEB-INF│ │ ├── classes│ │ │ └── it│ │ │ └── sevenbits│ │ │ └── example│ │ │ └── hello│ │ │ └── HelloWorldServlet.class│ │ └── web.xml│ ├── hello.war│ └── ROOT└── work

Курс по Java, 2016

WARWeb Application aRchive

│ ├── hello.war│ │ ├── index.jsp│ │ ├── META-INF│ │ └── WEB-INF│ │ ├── classes│ │ │ └── it│ │ │ └── sevenbits│ │ │ └── example│ │ │ └── hello│ │ │ └── HelloWorldServlet.class│ │ └── web.xml

Курс по Java, 2016

War в Maven<project> <modelVersion>4.0.0</modelVersion> <groupId>it.sevenbits.example</groupId> <artifactId>hello</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>hello Maven Webapp</name> <url>http://maven.apache.org</url> <build> <finalName>hello</finalName> </build></project>

Курс по Java, 2016

Webapp в Maven <dependencies> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> </dependencies>

Курс по Java, 2016

Webapp в Maven

Курс по Java, 2016

web.xml<web-app> <display-name>Sample Web Application</display-name> <servlet> <servlet-name>HelloWorldServlet</servlet-name> <servlet-class> it.sevenbits.example.hello.HelloWorldServlet </servlet-class> </servlet> <servlet-mapping> <servlet-name>HelloWorldServlet</servlet-name> <url-pattern>/world</url-pattern> </servlet-mapping></web-app>

Курс по Java, 2016

Сборка веб приложенияmvn package

cp target/hello.war $CATALINA_HOME/webapps

Курс по Java, 2016

HelloWorldServletpublic class HelloWorldServlet extends HttpServlet {

@Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/plain"); PrintWriter out = response.getWriter(); out.println("Hello, world"); }

}

Курс по Java, 2016

JSPJava Server Pages

Servlet наоборот

Курс по Java, 2016

hello_world.jsp<!DOCTYPE html><html><head> <title>Hello</title></head><body> <h1>Hello, world!</h1></body></html>

Курс по Java, 2016

Model — View — Controller

MVC

Курс по Java, 2016

Model● Атрибуты запроса● Сессия

Курс по Java, 2016

ViewJSP

<!DOCTYPE html><html><head> <title>Hello <%=request.getAttribute("name")%></title></head><body> <h1>Hello, <%=request.getAttribute("name")%>!</h1></body></html>

Курс по Java, 2016

ControllerServlet

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // model manipulations String name = request.getParameter("name"); request.setAttribute("name", name); // forward to view RequestDispatcher dispatcher = request.getRequestDispatcher("hello_name.jsp"); dispatcher.forward(request, response); }

Курс по Java, 2016

Forward RequestDispatcher.forward(request, response)

Курс по Java, 2016

Redirect HttpServlerResponse.sendRedirect(“path”)

Курс по Java, 2016

Курс по Java, 2016

J2EE

Курс по Java, 2016

Домашнее заданиеПоставить Tomcat.

Сделать простое веб приложение с отправкой формы.

Посмотреть, в какой java код превращаются JSP страницы.

annie.tarasenko@7bits.it denis.nelubin@7bits.it