JSTL表达式的有关问题

2012-10-25

JSTL表达式的问题？我在做例子时总是说这行有错误c:out value${error}/c:out错误如下：org.apache.ja

JSTL表达式的问题？
我在做例子时总是说这行有错误<c:out value="${error}"></c:out>
错误如下：
org.apache.jasper.JasperException: /WEB-INF/fail.jsp(29,2) According to TLD or attribute directive in tag file, attribute value does not accept any expressions
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:357)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:141)
org.apache.jasper.compiler.Validator$ValidateVisitor.checkXmlAttributes(Validator.java:940)
org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:695)
org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1441)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Validator.validate(Validator.java:1474)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:214)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:422)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:507)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:274)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:111)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:965)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:744)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:663)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:394)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:358)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
jsp页面代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><%@ taglib prefix="c" uri="/WEB-INF/c.tld" %><%@ taglib prefix="fmt" uri="/WEB-INF/fmt.tld" %><%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>ok</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:out value="${error}"></c:out><br>  </body></html>

<taglib><taglib-uri>/WEB-INF/core.tld</taglib-uri><taglib-location>/WEB-INF/tld/c.tld</taglib-location></taglib><?xml version="1.0" encoding="UTF-8"?><web-app version="2.4" 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"><servlet> <servlet-name>web</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>2</load-on-startup> </servlet> <servlet-mapping> <servlet-name>web</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> <servlet> <servlet-name>context</servlet-name> <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param><welcome-file-list> <welcome-file> login.jsp </welcome-file> </welcome-file-list> <taglib> <taglib-uri>/spring</taglib-uri> <taglib-location>/WEB-INF/spring.tld</taglib-location> </taglib> <taglib> <taglib-uri>/WEB-INF/c.tld</taglib-uri> <taglib-location>/WEB-INF/c.tld</taglib-location> </taglib> <taglib> <taglib-uri>/WEB-INF/fmt.tld</taglib-uri> <taglib-location>/WEB-INF/fmt.tld</taglib-location> </taglib></web-app># <%@ taglib prefix="fmt" uri="/WEB-INF/fmt.tld" %>
这个用法是对的，在容器启动的时候，会自动地将JSTL支持加载进来的，而并不用在web.xml中做什么配置。不知道你的包有没有导入正确，另外，你是不是试一下用<c:set />将error设置一下？String error = (String)request.getAttribute("error");<%=error%>
这么用就好使。一换成表达式的形式就出上面的错误。/** * */package web;import java.util.HashMap;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.SimpleFormController;import org.springframework.web.servlet.view.RedirectView;import pojo.Tusers;import service.UserService;/** * @author Administrator * */public class FormController extends SimpleFormController {private UserService userservice;private String fail_view;private String success_view;protected ModelAndView onSubmit(Object command) throws Exception{Tusers tt = (Tusers)command;System.out.println("userName: "+tt.getUserName());System.out.println("password: "+tt.getPassword());HashMap hm = new HashMap();try{userservice.checkLogin(tt);hm.put("userName", tt.getUserName());}catch(RuntimeException e){hm.put("error", e.getMessage());System.out.println(e);//return new ModelAndView(new RedirectView(this.getFail_view()),hm);return new ModelAndView(this.getFail_view(),hm);}return new ModelAndView(this.getSuccess_view(),hm);}/** * @return the userservice */public UserService getUserservice() {return userservice;}/** * @param userservice the userservice to set */public void setUserservice(UserService userservice) {this.userservice = userservice;}/** * @return the fail_view */public String getFail_view() {return fail_view;}/** * @param fail_view the fail_view to set */public void setFail_view(String fail_view) {this.fail_view = fail_view;}/** * @return the success_view */public String getSuccess_view() {return success_view;}/** * @param success_view the success_view to set */public void setSuccess_view(String success_view) {this.success_view = success_view;}}<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans><bean id="FormController" /></property> </bean> <bean id="urlMapping" class = "org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="viewClass"><value>org.springframework.web.servlet.view.JstlView</value></property><property name ="prefix"><value>/WEB-INF/</value></property><property name ="suffix"><value>.jsp</value></property></bean></beans>
请看看有什么地方不正确吗？ 9 楼 hgq0011 2007-04-10 “attribute value does not accept any expressions “不能接收表达示。那你就研究一下jstl<c:out>到底怎么写撒。
10 楼 genius0182 2007-04-11 问题解决了，我把JSTL1.1的包导进去就好用了。应该是以前的c标签太老的原因。谢谢大家的参与。

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JSTL表达式的有关问题