JSTL配合正则表达式在JSP中的应用
<%@ 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>
