javax servlet JspTagException Illegal use of when -style ta

阿新 • • 發佈：2019-02-14

class || leg 段子 glib views tle str rec

1、錯誤描述

javax.servlet.JspTagException:Illegal use of <when>-style tag without <choose >as its direct parent

2、錯誤原因

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%>

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

<html>
  <head>
    
    <title></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">
	

  </head>
  
  <body>
     <table>
         <tr>
           <th>時間</th>
           <th>地域</th>
           <th>姓名</th>
           <th>年齡</th>
           <th> 
性別</th>
           <th>QQ</th>
           <th>地址</th>
           <th>愛好</th>
           <th>備註</th>
         </tr>
         <tr>
           <c:forEach var="area" varStatus="areaStatus" items="{areaList}">
           		<c:when test="areaList == null || areaList.size()==0">
           			<td colspan="9"><center>無數據</center></td>
           		</c:when>
           		<c:otherwise>
           			<td>${area.statisDate}</td>
           			<td>${area.areaDesc}</td>
           			<td>${area.username}</td>
           			<td>${area.age}</td>
           			<td>${area.sex}</td>
           			<td>${area.qq}</td>
           			<td>${area.address}</td>
           			<td>${area.intester}</td>
           			<td>${area.shuoMing}</td>
           		</c:otherwise>
           </c:forEach>
         </tr>
     </table>
  </body>
</html>

3、解決辦法

（1）將<c:when></c:when>換成<c:if>

（2）利用struts2中的s標簽中的<s:if>

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