Java 简单 JSP - 根据 TLD 的标签属性无效
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Simple JSP - Attribute invalid for tag according to TLD
提问by Erran Morad
My project in eclipse -
我在 Eclipse 中的项目 -
I get the error below when I run MyTagUser.jsp - HTTP Status 500 - /jsp/MyTagUser.jsp(14,0) Attribute subTitle invalid for tag Header according to TLD
运行 MyTagUser.jsp 时出现以下错误 - HTTP Status 500 - /jsp/MyTagUser.jsp(14,0) Attribute subTitle invalid for tag Header according to TLD
org.apache.jasper.JasperException: /jsp/MyTagUser.jsp(14,0) Attribute subTitle
invalid for tag Header according to TLD
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)...etc.
Snippet from Header.jsp -
来自 Header.jsp 的片段 -
<body>
<img src="../images/java_logo.gif"><br>
<em><strong> ${subTitle} </strong></em> <br>
</body>
Snippet from MyTagUser.jsp -
来自 MyTagUser.jsp 的片段 -
<%@ taglib prefix="myTags" tagdir="/WEB-INF/tags"%>
<html>
<head>
</head>
<body>
<myTags:Header subTitle="Java is the best !!!" />
JSP and Servlets.
</body>
</html>
采纳答案by Erran Morad
You must use the attribute directive in your Header.tag file as show below -
您必须在 Header.tag 文件中使用属性指令，如下所示 -
<body>
<%@ attribute name="subTitle" required="true" rtexprvalue="true" %>
<img src="../images/java_logo.gif"><br>
<em><strong> ${subTitle} </strong></em> <br>
</body>
回答by ?lker Korkut
First Solution:
第一个解决方案：
It seems, you wanted to include header area in your jsp. But it's wrong way.
看来，您想在 jsp 中包含标题区域。但是方法不对。
You should create a header.jsp and then include header.jsp into your MyTagUser.jsp and they should be under the WEB-INF directory(or its sub-directory).
您应该创建一个 header.jsp，然后将 header.jsp 包含到您的 MyTagUser.jsp 中，它们应该位于 WEB-INF 目录（或其子目录）下。
Including method : <%@ include file="WEB-INF/tags/header.jsp"> use this code in MyTagUser.jsp
包含方法： <%@ include file="WEB-INF/tags/header.jsp"> 在 MyTagUser.jsp 中使用此代码
Second Solution :
第二种解决方案：
in your tag file
在你的标签文件中
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> core jstl taglib if necessary
<%@ attribute name="subtitle" required="true" %> this is subTitle attribute
you should define attribute(s). check out http://docs.oracle.com/javaee/1.4/tutorial/doc/JSPTags5.html
您应该定义属性。查看http://docs.oracle.com/javaee/1.4/tutorial/doc/JSPTags5.html
