el foreach 的嵌套循环

2024-04-20 06:38

文章标签 el foreach 嵌套循环

本文主要是介绍el foreach 的嵌套循环，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
   //创建一个list集合
   List list = new ArrayList();
   for (int i = 0; i < 23; i++) {
       list.add(i);
   }

   //将上面的list集合分成多个集合l，然和在把分成的集合撞进一个集合的集合lists

   //1:先根据list的对象个数算出分为多少行：
   int rownum = 0;

   if (list.size() % 5 == 0) {
       rownum = list.size() / 5;
   } else {
       rownum = list.size() / 5 + 1;
   }
   List lists = new ArrayList();
   for (int i = 0; i < rownum; i++) {
       List l = new ArrayList();
       for (int j = i * 5; j < i * 5 + 5 && j < list.size(); j++) {
           l.add(list.get(j));
       }
       lists.add(l);
   }
   //把集合的集合lists存入session
   session.setAttribute("lists", lists);
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
   <head>

       <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">
       <style type="text/css">
tr.foreach_tr1 {
   background-color: #D7E9FD;
   color: black;
}

tr.foreach_tr2 {
   background-color: #A7DBFF;
   color: black;
}
</style>
   </head>

   <body>
       <table border="1" width="200" cellpadding="0" cellspacing="0">
           <tr align="center" class="first_tr">
               <td colspan="5">
                   test
               </td>
           </tr>
           <tr>
               <c:forEach items="${lists}" varStatus="i" var="list">

                   <tr>
                       <c:forEach items="${list}" var="obj">
                           <td>
                               <c:out value="${obj}"></c:out>
                           </td>
                       </c:forEach>
                   </tr>

               </c:forEach>
           </tr>
       </table>
   </body>
</html>

运行的效果：