Struts 表单验证出错请高手指点下哪出错了

xuexijava 2008-04-27 04:16:13

注册页面login.jsp
<%@ page language="java"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>

<html>
<head>
<title>JSP for LoginForm form</title>
</head>
<body>
<html:form action="/login">
name : <html:text property="name"/><html:errors property="name"/><br/>
password : <html:password property="password"/><html:errors property="password"/><br/>

<html:submit/><html:cancel/>
</html:form>
</body>
</html>

ApplicationResources.properties文件如下：
# Resources for parameter 'com.yourcompany.struts.ApplicationResources'
# Project P/struts
ner=input is error

ActionForm 文件LoginFrom.java
package com.yourcompany.struts.form;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.*;
/**
* MyEclipse Struts
* Creation date: 04-27-2008
*
* XDoclet definition:
* @struts.form name="loginForm"
*/
public class LoginForm extends ActionForm {
/*
* Generated fields
*/

/** password property */
private String password;

/** name property */
private String name;

/*
* Generated Methods
*/

/**
* Method validate
* @param mapping
* @param request
* @return ActionErrors
*/
public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {
ActionErrors error=new ActionErrors();
if(this.name.equals("aaa"))
{
error.add("name", new ActionMessage("ner"));
}
return error;
}

/**
* Method reset
* @param mapping
* @param request
*/
public void reset(ActionMapping mapping, HttpServletRequest request) {
// TODO Auto-generated method stub
}

/**
* Returns the password.
* @return String
*/
public String getPassword() {
return password;
}

/**
* Set the password.
* @param password The password to set
*/
public void setPassword(String password) {
this.password = password;
}

/**
* Returns the name.
* @return String
*/
public String getName() {
return name;
}

/**
* Set the name.
* @param name The name to set
*/
public void setName(String name) {
this.name = name;
}
}
为什么点了提交后提示错误如下：
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: org.apache.struts.action.ActionMessage
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

root cause

java.lang.ClassCastException: org.apache.struts.action.ActionMessage
org.apache.struts.taglib.html.ErrorsTag.doStartTag(ErrorsTag.java:215)
org.apache.jsp.login_jsp._jspx_meth_html_errors_0(login_jsp.java:142)
org.apache.jsp.login_jsp._jspx_meth_html_form_0(login_jsp.java:95)
org.apache.jsp.login_jsp._jspService(login_jsp.java:66)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

note The full stack trace of the root cause is available in the Tomcat logs.

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