在页面上怎么不能显示${}所共享的内容？

在页面上怎么不能显示${}所共享的内容？而把源码打印出来了?
${tip}之前还能得到错误信息，现在把源码打印出来了，愁死了

解决方案 »

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和这前有什么变化吗？是不是把jsp改成html了。
什么错误消息？用${sessionScope.tip}试试看
页面引入了<%@ taglib prefix="c" uri= "http://java.sun.com/jstl/core"%>没有？
存入：
<c:set var="ct" value="<%=request.getContextPath()%>"/>
引用：
${ct}你那个原因可能就是在作用域内不存在了。
${tip} 即便是tip为null也应该不会影响页面的，看看是不是其它地方的问题，或者是tip这个变量的问题
这是action
package com.amaker.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.amaker.form.UserForm;
import com.amaker.beans.User;
import com.amaker.dao.UserDao;public class UserAction3 extends DispatchAction {
   UserDao dao;
public void setDao(UserDao dao) {
this.dao = dao;
} public ActionForward login(ActionMapping m, ActionForm f,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
System.out.println("111");
ApplicationContext context = new ClassPathXmlApplicationContext(
"applicationContext.xml");
dao = (UserDao) context.getBean("userDao");
System.out.println("222");
UserForm userForm = (UserForm) f;
String username = userForm.getUsername();
String password = userForm.getPassword();
System.out.println("333");
User u = dao.login(username, password);
System.out.println("444");
if (u != null) {
HttpSession session = request.getSession();
session.setAttribute("userSession", u);
System.out.println("55555");
return m.findForward("success");
} else {
String msg = "用户名不能为空或空格或用户名、年龄不正确";
     request.setAttribute("tip", msg);
return m.getInputForward();
}
} public ActionForward regedit(ActionMapping m, ActionForm f,
HttpServletRequest request, HttpServletResponse response) { ApplicationContext context = new ClassPathXmlApplicationContext(
"applicationContext.xml");
dao = (UserDao) context.getBean("userDao");

UserForm userForm = (UserForm) f;
String username = userForm.getUsername();
String password = userForm.getPassword();
        int age =userForm.getAge();
User u = new User();
u.setUsername(username);
u.setPassword(password);
u.setAge(age);
dao.register(u);
HttpSession session = request.getSession();
session.setAttribute("userSession", u);
return m.findForward("success");
}
}
这是页面
<%@ page language="java" pageEncoding="GBK"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<html>
<head>
<title>JSP for LoginForm form</title>
</head> <script type="text/javascript">
function invoke(method){
var f = document.forms[0];
f.action="<%=path%>/user.do?action="+method;
f.submit();
}
</script>
${sessionScope.tip}
<body>
  <html:messages id="" name="tip" ></html:messages>
<html:form action="/user?action=login">      username : <html:text property="username" value="admin" alt="username" maxlength="20"  title="NAME"/><html:errors property="username"/><br/>
password : <html:password property="password" value="password" alt="password" maxlength="20"  title="PASSWORD"/><html:errors property="password"/><br/>
<%--<input type="button" value="login" onclick="invoke('login')"/>
<input type="button" value="regedit" onclick="invoke('regedit')"/> --%>
<html:submit/><html:cancel/>
</html:form>
</body>
</html>
我解决了，我用的是JAVA J2EE 下面的容器不支持EL表达式
在 web.xml里看容器版本.<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" 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">
如果是2.4一下的版本，可以在页面显示的写 el="true"
你有没有加STRUTS的标签啥,好好看看啊
在页面上导入下面的代码
<%@ page isELIgnored="false" %>
  可能是版本的问题吧,我创建的时候都用
    J2EE 5.0 它默认支持的