JSTL 遍历数组，List，Set，Map 等
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时间：2015年03月24日
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ page import="java.util.*"%>
<%@ page import="bean.User"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
int[] ages = { 1, 2, 3, 4, 5 }; // 普通数组，JSTL直接使用JSP赋值表达式来取
List<String> names = new LinkedList<String>(); // List
names.add("Biao");
names.add("彪");
names.add("雷");
request.setAttribute("names", names); // 添加到request
Set<String> set = new TreeSet<String>(); // Set
set.add("One");
set.add("One");
set.add("Two");
set.add("Three");
set.add("Set");
Map<String, String> map = new HashMap<String, String>(); // Map
map.put("1", "黄彪");
map.put("2", "丫头");
map.put("3", "哥哥");
map.put("4", "笨蛋");
List<User> users = new ArrayList<User>(); // JavaBean的List
users.add(new User("黄彪", "xxxxxx"));
users.add(new User("昊天", "xxxxxx"));
users.add(new User("姐姐", "yyyyyy"));
users.add(new User("丫头", "zzzzzz"));
session.setAttribute("users", users); // 添加到session
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Iterator Collections</title>
<style type="text/css">
table {
border-collapse: collapse;
border: 1px solid black;
}
td, th {
border: 1px solid black;
}
tr:nth-child(even) {
background: #eee;
}
</style>
</head>
<body>
<center>
遍历数组:
<c:forEach var="age" items="<%= ages %>">
<c:out value="${age}" />
</c:forEach>
<br />
遍历List:
<c:forEach var="name" items="<%= names %>">
<c:out value="${name}" />
</c:forEach>
<br />
遍历List:
<c:forEach var="name" items="${names}">
<c:out value="${name}" />
</c:forEach>
<br />
遍历Set:
<c:forEach var="entry" items="<%= set %>">
<c:out value="${entry}" />
</c:forEach>
<br />
遍历Map:
<table>
<tr>
<th>Key</th>
<th>Value</th>
</tr>
<c:forEach var="entry" items="<%= map %>">
<tr>
<td><c:out value="${entry.key}"/></td>
<td><c:out value="${entry.value}"/></td>
</tr>
</c:forEach>
</table>
<br />
遍历UserBean的List:
<table>
<tr>
<th>username</th>
<th>password</th>
</tr>
<c:forEach var="user" items="${users}">
<tr>
<td><c:out value="${user.username}"/></td>
<td><c:out value="${user.password}"/></td>
</tr>
</c:forEach>
</table>
</center>
</body>
</html>
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ page import="java.util.*"%>
<%@ page import="bean.User"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
int[] ages = { 1, 2, 3, 4, 5 }; // 普通数组，JSTL直接使用JSP赋值表达式来取
List<String> names = new LinkedList<String>(); // List
names.add("Biao");
names.add("彪");
names.add("雷");
request.setAttribute("names", names); // 添加到request
Set<String> set = new TreeSet<String>(); // Set
set.add("One");
set.add("One");
set.add("Two");
set.add("Three");
set.add("Set");
Map<String, String> map = new HashMap<String, String>(); // Map
map.put("1", "黄彪");
map.put("2", "丫头");
map.put("3", "哥哥");
map.put("4", "笨蛋");
List<User> users = new ArrayList<User>(); // JavaBean的List
users.add(new User("黄彪", "xxxxxx"));
users.add(new User("昊天", "xxxxxx"));
users.add(new User("姐姐", "yyyyyy"));
users.add(new User("丫头", "zzzzzz"));
session.setAttribute("users", users); // 添加到session
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Iterator Collections</title>
<style type="text/css">
table {
border-collapse: collapse;
border: 1px solid black;
}
td, th {
border: 1px solid black;
}
tr:nth-child(even) {
background: #eee;
}
</style>
</head>
<body>
<center>
遍历数组:
<c:forEach var="age" items="<%= ages %>">
<c:out value="${age}" />
</c:forEach>
<br />
遍历List:
<c:forEach var="name" items="<%= names %>">
<c:out value="${name}" />
</c:forEach>
<br />
遍历List:
<c:forEach var="name" items="${names}">
<c:out value="${name}" />
</c:forEach>
<br />
遍历Set:
<c:forEach var="entry" items="<%= set %>">
<c:out value="${entry}" />
</c:forEach>
<br />
遍历Map:
<table>
<tr>
<th>Key</th>
<th>Value</th>
</tr>
<c:forEach var="entry" items="<%= map %>">
<tr>
<td><c:out value="${entry.key}"/></td>
<td><c:out value="${entry.value}"/></td>
</tr>
</c:forEach>
</table>
<br />
遍历UserBean的List:
<table>
<tr>
<th>username</th>
<th>password</th>
</tr>
<c:forEach var="user" items="${users}">
<tr>
<td><c:out value="${user.username}"/></td>
<td><c:out value="${user.password}"/></td>
</tr>
</c:forEach>
</table>
</center>
</body>
</html>
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