jstl 问题rg.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jsp/jstl/core cannot

想用下jstl，用法如下：
报错结果：rg.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this applicationweb.xml配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <taglib> 
    <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/fmt.tld</taglib-location> 
 </taglib> <taglib> 
    <taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/fmt-rt.tld</taglib-location> 
</taglib> <taglib> 
    <taglib-uri>http://java.sun.com/jstl/core</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/c.tld</taglib-location> 
</taglib> <taglib> 
    <taglib-uri>http://java.sun.com/jstl/core-rt</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/c-rt.tld</taglib-location> 
</taglib> <taglib> 
    <taglib-uri>http://java.sun.com/jstl/sql</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/sql.tld</taglib-location> 
</taglib> <taglib> 
    <taglib-uri>http://java.sun.com/jstl/sql-rt</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/sql-rt.tld</taglib-location> 
</taglib> <taglib> 
    <taglib-uri>http://java.sun.com/jstl/x</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/x.tld</taglib-location> 
</taglib> <taglib> 
    <taglib-uri>http://java.sun.com/jstl/x-rt</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/x-rt.tld</taglib-location> 
</taglib> 
  
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>3</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>jsp页面
<%@ page language="java"  pageEncoding="utf-8"%>
<%@ taglib  uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'display.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">    
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->  </head>
  
  <body>
  <c:forEach items="${requestScope['guestbook.display.list']}" var="article">
  <c:out value="${article.id}"/>
  <c:out value="${article.name}"/>
  <c:out value="${article.email}"/>
  <c:out value="${article.phone}"/>
  <c:out value="${article.title}"/>
  <c:out value="${article.content}"/>
  <c:out value="${article.time}"/>
    
  </c:forEach>
  
  </body>
</html>
不知道为什么web.xml  :<taglib> 
    <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri> 
    <taglib-location>/WEB-INF/tlds/fmt.tld</taglib-location> 
 </taglib
起始处报错，程序运行报错：rg.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
我想是配置问题，大家都遇到过没有啊？？