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通过JSTL+EL实现循环迭代

2015-07-08 12:39 771 查看

使用前需要导入包 jstl.jar 和 standard.jar

<%@ page language="java" import="java.util.*,com.wzh.test.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>使用el+jstl完成数据迭代</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body><br>

<%
List list=new ArrayList();
list.add(new Person("aa"));
list.add(new Person("bb"));
list.add(new Person("cc"));
request.setAttribute("slist", list);
%>
<c:forEach items="${slist }" var="person">
${person.name} </br>
</c:forEach>

<%
Map map = new HashMap();
map.put("aa", new Person("aaa"));
map.put("bb11", new Person("bbb"));
request.setAttribute("smap", map);
%>

<c:forEach items="${smap }" var="entry">
${entry.key } : ${entry.value.name }  </br>
</c:forEach>

<c:if test="${user!=null }">
欢迎您：${user.username }
</c:if>

<c:if test="${user==null }">
请登录
</c:if>
</body>
</html>

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