JSTL配合正则表达式在JSP中的应用

时间：2022-09-19 08:56:01
<%@ 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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