<%@ 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;
}
}