Question

我正在尝试在liferay 6.0 portlet应用程序中使用JSP 2.0标记文件。

以下是我遵循的步骤：

我的jsp很简单：home.jsp。

<%@ taglib prefix="tags" tagdir="/WEB-INF/tags" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<table>
    <tr>
        <td> <tags:tagDemo/> </td>
        <td><c:out value="Cout Hello"/></td>
    </tr>
</table>

我的标记文件非常简单：/WEB-INF/tags/tagDemo.tag
```
hello
```

/WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-  app_2_4.xsd" version="2.4">

    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/classes/log4j.properties</param-value>
    </context-param>

    <servlet>
        <servlet-name>view-servlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.ViewRendererServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>view-servlet</servlet-name>
        <url-pattern>/WEB-INF/servlet/view</url-pattern>
    </servlet-mapping>

</web-app>

这会引发以下错误：

00:14:42,642 ERROR [render_portlet_jsp:154] org.apache.jasper.JasperException: /WEB-INF/jsp/home.jsp (line: 55, column: 6) No tag "tagDemo" defined in tag library imported with prefix "tags"
    at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
    at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:408)
    at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:199)
    at org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1215)
    at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1450)
    at org.apache.jasper.compiler.Parser.parse(Parser.java:138)
    at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242)
    at org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)

有人能告诉我问题在哪里吗？

Answer 1

我认为错误在于此指令：<%@ taglib prefix="tags" tagdir="/WEB-INF/tags" %>

应该是：<%@ taglib prefix="tags" tagdir="/WEB-INF/tags/tagDemo.tag" %>

我也找到了一个很好的JSP 2.0自定义标签教程here。

为什么JSP 2.0自定义标记文件不能与Portlet一起使用？

1 个答案: