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JSTL配合EL表达式在JSP中的应用

2013-09-26 22:53 239 查看

<%@ page language="java" import="java.util.*,cn.com.Person" 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>JSTLandEl</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>
     <%
     	ArrayList list=new ArrayList();
     	list.add(new Person("wy"));
     	list.add(new Person("wyy"));
     	list.add(new Person("wyyy"));
     	request.setAttribute("list", list);
      %>
      <!-- 集合带过来的数据怎么遍历呢？用到了JSTL -->
      <c:forEach var="person" items="${list}">
      	${person.name}
      </c:forEach>
      
      <br/>
      <%
      	Map map=new HashMap();
      	map.put("1", new Person("aaaa"));
      	map.put("b", new Person("bbbb"));
      	map.put("c", new Person("cccc"));
      	map.put("d", new Person("dddd"));
      	request.setAttribute("map", map);
       %>
       <c:forEach var="entry" items="${map}">
       		${entry.key }:${entry.value.name}
       		<br/>
       </c:forEach>
       
       
       <!-- 测试标签 -->
       <c:if test="${user!=null}">
       		欢迎您：${user.username}
       </c:if>
       <c:if test="${user==null}">
       		用户名：<input type="text">
       		密码：<input type="password">
       </c:if>
       
  </body>
</html>

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