<%@page import="cn.gbx.domain.Address"%>
<%@page import="cn.gbx.domain.User"%>
<%@ page language="java" import="java.util.*" 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>My JSP 'index.jsp' starting page</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>
<%-- 取普通数据 --%>
<%
String data = "abcd";
request.setAttribute("data", data);
%>
${data} <br/> <%-- pageCopntext.findAttribute(data) page request sesson pageContext --%>
<hr>
<%-- 取JavaBaen中的属性 --%>
<%
User user = new User("aa","123");
// user = null;
request.setAttribute("user",user);
%>
<c:if test="${!empty(user)}">
${user.username}
</c:if>
<hr>
<%-- 取JavaBaen中的属性 --%>
<%
User user1 = new User("aa","123");
Address a = new Address();
a.setName("山东");
user1.setAddress(a);
request.setAttribute("user1",user1);
%>
${user1.address.name} <%-- 一路.到底 --%>
<hr>
<%-- list集合的取值， 以及结合JSTL的遍历 --%>
<%
List<User> users = new ArrayList<User>();
users.add(new User("aa","12"));
users.add(new User("bb","23"));
users.add(new User("cc","45"));
request.setAttribute("users", users);
%>
${ users[0].username } <br/>
<c:forEach var="u" items="${users}"> <%-- 大哥一定要记住 items 里面加$ --%>
${u.username}
${u.password}
<br/>
</c:forEach>
<hr>
<%-- 遍历map集合 --%>
<%
Map<String, User> map = new HashMap<String, User>();
map.put("a", new User("aa","a1"));
map.put("b", new User("bb","b1"));
map.put("c", new User("cc","c1"));
request.setAttribute("map", map);
%>
${ map.a.username} ${ map['b'].username } <br/>
<c:forEach var="entry" items="${ map }">
${entry.key }
${entry.value.username }
${entry.value.password }
<br/>
</c:forEach>
<hr>
<%-- 拿到当前web应用的路径 --%>
${ pageContext.request.contextPath }
</body>
</html>