jsp---EL存取器
来源：岁月联盟
时间：2012-02-05
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package com.javaweb.ch08;
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import java.util.*;
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//一个简单的JavaBean示例
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public class Person{
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//name属性
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private String name;
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//age属性
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private int age;
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//sex属性
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private String sex;
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//friends属性
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private ArrayList friends;
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//无参构造方法
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public Person(){
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}
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//自定义构造的方法
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public Person(String name,int age,String sex){
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this.name = name;
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this.age = age;
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this.sex = sex;
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}
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//获取name的属性值
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public String getName(){
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return name;
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}
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//获取age属性值
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public int getAge(){
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return age;
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}
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//获取sex的属性值
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public String getSex(){
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return sex;
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}
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//设置name的属性
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public void setName(String name){
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this.name = name;
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}
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//设置age的属性值
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public void setAge(int age){
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this.age = age;
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}
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//设置sex的属性值
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public void setSex(String sex){
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this.sex = sex;
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}
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//设置friends的值
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public void setFriends(ArrayList friends){
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this.friends = friends;
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}
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//获取friends的属性值
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public ArrayList getFriends(){
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return friends;
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}
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}
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<%@page import="java.util.*,com.javaweb.ch08.*" %>
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<!DOCTYPE html>
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<html>
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<head>
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<title>设置JavaBean中的属性</title>
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</head>
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<body>
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<%
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//实例化一个Person
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Person person = new Person("zhangdapeng",24,"男");
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//创建一个friends实例
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ArrayList friends = new ArrayList();
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//添加值
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friends.add("wang wu");
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friends.add("li si");
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person.setFriends(friends);
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//存储在session范围内
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session.setAttribute("person",person);
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%>
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<a href="GetJavaBean.jsp">跳转到GetJavaBean.jsp</a>
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</body>
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</html>
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<!DOCTYPE html>
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<html>
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<head>
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<title>取得JavaBean中的属性值</title>
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</head>
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<body>
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姓名：${sessionScope.person.name}<br />
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年龄：${sessionScope.person.age}<br />
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性别：${sessionScope.person.sex}<br />
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朋友：${sessionScope.person.friends[0]},${sessionScope.person.friends[1]}<br />
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</body>
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</html>
使用存储器读取Map中的数据
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<%@page import="java.util.*,com.javaweb.ch08.*" %>
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<!DOCTYPE html>
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<html>
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<head>
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<title>设置Map页面</title>
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</head>
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<body>
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<%
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//新建一个HashMap
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HashMap userInfo = new HashMap();
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//在HashMap中设置值
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userInfo.put("username","zhangdapeng");
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userInfo.put("password","zhnagda123");
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//将值存储到session范围中
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session.setAttribute("userInfo",userInfo);
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%>
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<a href="GetMapDemo.jsp">跳转到GetMapDemo.jsp</a>
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</body>
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</html>
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<!DOCTYPE html>
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<html>
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<head>
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<title>使用存储器读取map中的数据</title>
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</head>
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<body>
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用户名：${sessionScope.userInfo.username}<br />
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密码：${sessionScope.userInfo.password}<br />
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</body>
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</html>
使用存储器读取数组中的数据
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<%@page import="java.util.*,com.javaweb.ch08.*" %>
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<!DOCTYPE html>
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<html>
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<head>
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<title>设置Array页面</title>
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</head>
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<body>
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<%
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String[] names = {"zhangda1","zhangda2","zhangda3"};
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//将值存储到session范围中
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session.setAttribute("names",names);
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%>
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<a href="GetMapDemo.jsp">跳转到GetArrayDemo.jsp</a>
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</body>
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</html>
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<!DOCTYPE html>
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<html>
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<head>
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<title>使用存储器读取map中的数据</title>
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</head>
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<body>
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用户名1：${sessionScope.names[0]}<br />
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用户名2：${sessionScope.names[1]}<br />
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</body>
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</html>
存储器的复杂应用
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<%@page import="java.util.*,com.javaweb.ch08.*" %>
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<!DOCTYPE html>
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<html>
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<head>
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<title>设置Array页面</title>
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</head>
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<body>
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<%
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ArrayList<Person> persons = new ArrayList<Person>();
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Person person1 = new Person("wang wu",24,"男");
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Person person2 = new Person("wang liu",24,"女");
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persons.add(person1);
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persons.add(person2);
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session.setAttribute("persons",persons);
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%>
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<a href="GetMapDemo.jsp">跳转到GetArrayDemo.jsp</a>
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</body>
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</html>
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<!DOCTYPE html>
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<html>
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<head>
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<title>使用存储器读取map中的数据</title>
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</head>
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<body>
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用户名1：${sessionScope.persons[0].name},${sessionScope.persons[0].age},${sessionScope.persons[0].sex}<br />
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用户名2：${sessionScope.persons[1].name},${sessionScope.persons[1].age},${sessionScope.persons[1].sex}<br />
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</body>
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</html>
摘自 张大鹏的博客
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