EL表达式在设计模式应用（VO类+jsp+Sevlet）

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1:VO类

package cn.mldn.lxh.vo;

import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
public class ELListServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
List<Dept> all=new ArrayList<Dept>();
Dept dept=null;
dept=new Dept();
dept.setDeptno(101);
dept.setName("开发工程师");
dept.setLoc("北京市");
all.add(dept);
dept=new Dept();
dept.setDeptno(102);
dept.setName("前端工程师");
dept.setLoc("北京市");
all.add(dept);
dept.setDeptno(103);
dept.setName("运维工程师");
dept.setLoc("北京市");
all.add(dept);
request.setAttribute("alldept", all);
request.getRequestDispatcher("el/list_dept.jsp").forward(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}

}

2:Servlet

package cn.mldn.lxh.vo;
import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
public class ELListServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
List<Dept> all=new ArrayList<Dept>();
Dept dept=null;
dept=new Dept();
dept.setDeptno(101);
dept.setName("开发工程师");
dept.setLoc("北京市");
all.add(dept);
dept=new Dept();
dept.setDeptno(102);
dept.setName("前端工程师");
dept.setLoc("北京市");
all.add(dept);
dept.setDeptno(103);
dept.setName("运维工程师");
dept.setLoc("北京市");
all.add(dept);
request.setAttribute("alldept", all);
request.getRequestDispatcher("el/list_dept.jsp").forward(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}

}

3:Jsp(EL表达式)

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="cn.mldn.lxh.vo.Dept" %>
<!DOCTYPE HTML>
<html>
<head>
<title></title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
Dept dept=new Dept();
dept.setDeptno(1001);
dept.setName("发软件开发");
dept.setLoc("北京市");
request.setAttribute("deptinfo", dept);
%>
<h3>部门编号:${deptinfo.deptno}</h3>
<h3>部门姓名:${deptinfo.name}</h3>
<h3>部门位置:${deptinfo.loc}</h3>
</body>
</html>

4:XML文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>myproject1</display-name>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>ELListServlet</servlet-name>
<servlet-class>cn.mldn.lxh.vo.ELListServlet</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>HelloTag</servlet-name>
<servlet-class>cn.mldn.lxh.vo.HelloTag</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>CheckServlet</servlet-name>
<servlet-class>cn.mldn.lxh.vo.CheckServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>ELListServlet</servlet-name>
<url-pattern>/el/ELListServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>HelloTag</servlet-name>
<url-pattern>/HelloTag</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CheckServlet</servlet-name>
<url-pattern>/CheckServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

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