JSTL入门实例

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@page import="bean.Person"%><%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>jstl+el表达式示例代码</title>  </head>    <body>          <!-- 使用jstl+el表达式可以迭代list集合 -->    <%     Person p1 = new Person();    p1.setName("aa111");        Person p2 = new Person();    p2.setName("bb");        List list = new ArrayList();    list.add(p1);    list.add(p2);        request.setAttribute("list",list);    %>        <c:forEach var="person" items="${list}">    ${person.name }<br/>    </c:forEach>           <!-- 使用jstl+el表达式可以迭代map集合 -->    <%     Map map = new HashMap();    map.put("a","aaaaxxx");    map.put("b","bbbb");    map.put("c","cccc");    map.put("1","aaaa1111");        request.setAttribute("map",map);    %>        <br/>       <%-- Set<Map.Entry> set = map.entrySet()--%>    <c:forEach var="me" items="${map}">      ${me.key } = ${me.value }<br/>    </c:forEach>          <br/><br/>        <c:if test="${user!=null}">    欢迎您：${user.uesrname }    </c:if>         <c:if test="${user==null}">    用户名：<input type="text" name="username">    密码：<input type="password" name="password">    <input type="submit" value="登陆">    </c:if>  </body></html>

package bean;public class Person {public String name;public int age;public Address address;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public Address getAddress() {return address;}public void setAddress(Address address) {this.address = address;}}

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