关于ActionForm的validate的问题？

用＜html:error/＞显示错误,这个没有问题,我用这个还显示了另外一个逻辑错误,没有错误,
资源文件也没有问题.

哪个ActionErrors errors对象,是不是由框架自动转发到jsp页面?由＜html:error/＞接收.errors保存在那里?

ActionMessage error=new ActionMessage("hello.no.username.error");
errors.add("username",error);
用new ActionMessage ，不用new ActionError

楼上正解用JBUILDER 那么写就会报错

在jsp页面中，用＜html;error/＞显示错误,运行后,如果不输入任何东西,然后提交,应该显示"Please enter a<i>username</i>to say hello to!" 但我的程序提交后没有任何反应,这个问题困惑我好久了,不知到问题出在那?各位高手帮我看看到底错到那了?我的HelloForm.javapackage com.yourcompany.struts.form;import javax.servlet.http.HttpServletRequest;import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;
//import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;/**
* MyEclipse Struts
* Creation date: 03-29-2006
*
* XDoclet definition:
* @struts.form name="helloForm"
*/
public final class HelloForm extends ActionForm { // --------------------------------------------------------- Instance Variables // --------------------------------------------------------- Methods /**
*
*/

/**
*
*/
     private static final long serialVersionUID = 1L;
/**
* Method validate
* @param mapping
* @param request
* @return ActionErrors
*/
private String userName=null;
public String getUserName(){
return this.userName;
}
public void setUserName(String username){
this.userName=username;
}
public void reset(ActionMapping mapping, HttpServletRequest request) { // TODO Auto-generated method stub
this.userName=null;
}
public ActionErrors validate(
ActionMapping mapping,
HttpServletRequest request) { // TODO Auto-generated method stub
ActionError error=new ActionError("hello.dont.take.to.monster");
ActionErrors errors=new ActionErrors();
// ActionMessage am=new ActionMessage("hello.no.username.error");
if ((userName==null)||(userName.length()<-1)){
errors.add("username",error);
// errors.add("username",am);
//return errors;
}
return errors;
} /**
* Method reset
* @param mapping
* @param request
*/
}我的jsp页面:<%@ 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"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic"%>
<html:html locale="true">
<head>
<title><bean:message key="hello.jsp.title"/></title>
<html:base/>
</head>
<body>

hello ,everyone:test1
<H2><bean:message key="hello.jsp.page.heading"/></H2><p>
<html:errors property="username"/><p>

<logic:present name="personbean" scope="request">
       <h2>
         <bean:message key="hello.jsp.page.hello"/>
        <bean:write name="personbean" property="userName"/><p>
        </h2>
     </logic:present>

<html:form action="/hello.do" scope="userName">

     <bean:message key="hello.jsp.prompt.person"/>
<html:text property="userName" size="16" maxlength="16"/> <br>
<html:submit/><html:reset/>
</html:form>

</body>
</html:html>我的truts-config.xml文件:<form-beans >
    <form-bean name="helloForm" type="com.yourcompany.struts.form.HelloForm" />  </form-beans>  <global-exceptions />
  <global-forwards />
  <action-mappings >
    <action
      attribute="helloForm"
      input="/form/hello.jsp"
      name="helloForm"
      path="/hello"
      scope="request"
      type="com.yourcompany.struts.action.HelloAction" >
      <forward name="SayHello" path="/form/hello.jsp"/>
      </action>
  </action-mappings>  <message-resources parameter="com.yourcompany.struts.ApplicationResources" />
</struts-config>我的HelloAction.java:package com.yourcompany.struts.action;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;
//import org.apache.struts.action.ActionMessage;
import com.yourcompany.struts.form.HelloForm;/**
* MyEclipse Struts
* Creation date: 03-29-2006
*
* XDoclet definition:
* @struts.action path="/hello" name="helloForm" input="/form/hello.jsp" scope="request" validate="true"
*/
public class HelloAction extends Action { // --------------------------------------------------------- Instance Variables // --------------------------------------------------------- Methods /**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) {
HelloForm helloForm = (HelloForm) form;
String username=helloForm.getUserName();
String badUserName="monster";
ActionError error=new ActionError("hello.dont.take.to.monster");
ActionErrors errors=new ActionErrors();
if((username.equalsIgnoreCase(badUserName))){
// errors.add("username",new ActionMessage("hello.dont.take.to.monster"));
errors.add("username",error);

this.saveErrors(request, errors);
return (new ActionForward(mapping.getInput()));
//return (mapping.findForward("SayHello"));
} // TODO Auto-generated method stub
PersonBean pb=new PersonBean();
pb.setUserName(username);
pb.SaveToPersistentStore();
request.setAttribute(Constants.PERSON_KEY, pb);

return (mapping.findForward("SayHello"));
}}

public ActionErrors validate(
ActionMapping mapping,
HttpServletRequest request) {
ActionErrors errors=new ActionErrors();
if ((userName==null)||(userName.length()<-1)){
errors.add("userName",new ActionError("hello.no.username.error"));
}
return errors;
}
改成这样看看呢!

检查一下struts配置文件，有没有在相应的action设置加上validate=true

写JUnit test吧，一劳永逸。

调试易

关于ActionForm的validate的问题？

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