JSTL 逆序输出
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2022-06-06 16:29:20
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最近在写代码，有一个功能，需要把后台传递到前台的数据逆序输出，本想通过Collections.reverse(list);对list中的数据进行逆序排列后再传递到后台，但想到for循环都可以逆序输出，就想JSTL是否也有可以进行相关操作，结果搞了半个多钟才写出了下面一段代码
<%@page import="com.jasper.domain.Person"%>
<%@page import="java.util.List"%>
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<%
//Person对象中有两个属性，age和name
List<Person> persons = new ArrayList<Person>();
Person person1 = new Person();
person1.setAge(12);
person1.setName("小明");
persons.add(person1);
Person person2 = new Person();
person2.setAge(13);
person2.setName("阿飞");
persons.add(person2);
request.setAttribute("persons", persons);
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSTL逆序循环</title>
</head>
<body>
<div>正序</div>
<div>
<table>
<thead>
<tr>
<th>年龄</th>
<th>姓名</th>
</tr>
</thead>
<tbody>
<c:forEach var="person" items="${persons }">
<tr>
<td>${person.age }</td>
<td>${person.name }</td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
<br />
<div>逆序</div>
<div>
<table>
<thead>
<tr>
<th>年龄</th>
<th>姓名</th>
</tr>
</thead>
<tbody>
<c:set var="startIndex" value="${fn:length(persons)-1 }"></c:set>
<c:forEach var="person" items="${persons }" varStatus="status">
<tr>
<td>${persons[startIndex - status.index].age }</td>
<td>${persons[startIndex - status.index].name }</td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
<br />
</body>
</html>