为什么<taglib>在我的web.xml中给我一个问题

Question

我有这个web.xml

<?xml version="1.0" encoding="UTF-8"?>
  <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
   <display-name>jsp-tags</display-name>
     <taglib>
       <taglib-uri>mytags</taglib-uri>
       <taglib-location>/WEB-INF/mytaglib.tld</taglib-location>
    </taglib>
    <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
   </welcome-file-list> 
</web-app>

突出显示,IDE给出的错误是:"从元素开始发现无效内容...

我还需要做什么？

Answer 1

使用此表示法:

<jsp-config> 
        <taglib> 
               <taglib-uri>mytags</taglib-uri> 
               <taglib-location>/WEB-INF/jsp/mytaglib.tld</taglib-location> 
        </taglib> 
</jsp-config>

但我建议阅读此链接.本教程将为您提供如何在JSP 2.0中避免在web.xml中声明taglib的想法

Answer 2

在XML中引用的XSD中,它声明对于复杂类型的web-appType,您只能选择以下零个元素:

<xsd:choice minOccurs="0" maxOccurs="unbounded">
  <xsd:group ref="javaee:descriptionGroup"/>
  <xsd:element name="distributable"
 type="javaee:emptyType"/>
  <xsd:element name="context-param"
 type="javaee:param-valueType">

  </xsd:element>
  <xsd:element name="filter"
 type="javaee:filterType"/>
  <xsd:element name="filter-mapping"
 type="javaee:filter-mappingType"/>
  <xsd:element name="listener"
 type="javaee:listenerType"/>
  <xsd:element name="servlet"
 type="javaee:servletType"/>
  <xsd:element name="servlet-mapping"
 type="javaee:servlet-mappingType"/>
  <xsd:element name="session-config"
 type="javaee:session-configType"/>
  <xsd:element name="mime-mapping"
 type="javaee:mime-mappingType"/>
  <xsd:element name="welcome-file-list"
 type="javaee:welcome-file-listType"/>
  <xsd:element name="error-page"
 type="javaee:error-pageType"/>
  <xsd:element name="jsp-config"
 type="javaee:jsp-configType"/>
  <xsd:element name="security-constraint"
 type="javaee:security-constraintType"/>
  <xsd:element name="login-config"
 type="javaee:login-configType"/>
  <xsd:element name="security-role"
 type="javaee:security-roleType"/>
  <xsd:group ref="javaee:jndiEnvironmentRefsGroup"/>
  <xsd:element name="message-destination"
 type="javaee:message-destinationType"/>
  <xsd:element name="locale-encoding-mapping-list"
 type="javaee:locale-encoding-mapping-listType"/>
</xsd:choice>

完全没有在XSD中引用taglib元素.

从阅读此链接看起来您似乎不需要在web-app文档中声明taglib.只需拥有version ="2.5"属性就意味着您可以在JSP中引用标记.