jstl问题
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jstl/fmt" prefix="fmt" %>
<%@ page import="org.jbit.chp08.bean.*" %>
<%
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 'index.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>
<%
User user = new User();
request.setAttribute("user",user);
%>
<c:set target="${user }" property="name" value="defaultName"></c:set>
<c:out value="${user.name}" default="noUserName"></c:out>
<body>
</body>
</html>
------------------------------------------------
报错：
HTTP Status 500 -
--------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.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
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:53)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:116)
org.apache.jasper.compiler.TagLibraryInfoImpl.generateTLDLocation(TagLibraryInfoImpl.java:310)
org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:152)
org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:410)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:475)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1425)
org.apache.jasper.compiler.Parser.parse(Parser.java:138)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:239)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:197)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:372)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:352)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:339)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:594)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:344)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.11 logs.
[解决办法]
帮你 goole 了下：
关于JSP中org.apache.jasper.JasperException:
This absolute uri http://java.sun.com/jsp/jstl/core) cannot be resolved in either web.xml or the jar files deployed with this application
照着《精通JSP--Web开发技术与典型应用》敲了一段JSTL的代码。没想到报错了。为这个问题搞了一下午，坐得屁股疼……
我的开发环境是Eclipse 3.2.0、Myeclipse 5.0、Tomcat 5.0.28(它用的是JRE1.4)和JDK1.5
从网上搜了一下，相同的说法是：一个就是JSTL的版本问题（1.0与1.1），是否不一致。还有就是检查虚拟目录下WEB-INF目录下的lib文件夹(如果同有lib文件夹，后动创建一个）中是否有jstl.jar和standard.jar两个jar包，如果没有则把它们复制到lib下面。
都试了，不过报错依旧……后来又找了一下加上自己的乱搞，按照上面的改过之后，大体有两种解决方法：
第一种就是在Eclipse的工程中导入JSTL1.1后，下载JSTL1.1 http://jakarta.apache.org/taglibs/index.html
然后解压,把*.jar和*.tld放到/WEB-INF/lib目录下。也就是将所有的jakarta-taglibs-standard-current.zip（JSTL的类库）中的.jar和.tlb放到WEB-INF目录下的lib文件夹中，JSP文件中导入<%@ taglib prefix="c" uri="/WEB-INF/lib/c.tld" %>，经试验是可以的。
第二种是修改web.xml，加上下面的语句：
<jsp-config>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/xml</taglib-uri>
<taglib-location>/WEB-INF/x.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/fmt</taglib-uri>
<taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/sql</taglib-uri>
<taglib-location>/WEB-INF/sql.tld</taglib-location>
</taglib>
</jsp-config>
JSP中导入<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>。应该就可以了……
推荐第二种^_^！
顺便说句，楼主真懒，
我的异常网推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.myexception.cn/java-web/317.html
