初学STRUTS问题（2）--- form bean的validate方法为什么没能给我返回error？？？

Arqui 2004-09-22 11:50:44

功能：输入USERNAM将会有欢迎字样；
输入错误（NULL）将会有ERROR提示；
输入正确时限是正确

error显示页：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>

<html:html locale="true">
<head>
<title><bean:message key="hello.jsp.title"/></title>
<html:base/>
</head>

<body bgcolor="white"><p>
<h2><bean:message key="hello.jsp.page.heading"/></h2><p>
<html:errors /><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="/HelloWorld.do" focus="userName" >
<bean:message key="hello.jsp.prompt.person"/>
<html:text property="userName" size="16" maxlength="16"/><br>
<html:submit property="submit" value="Submit"/>
<html:reset/>

</html:form><br>

<html:img page="/img/cat.jpg" alt="Powered by Cat"/>
</body>
</html:html>

formbean:
package hello;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;

public final class HelloForm extends ActionForm {

private String userName = null;

public String getUserName() {
return (this.userName);
}

public void setUserName(String userName) {
this.userName = userName;
}

/**
* Reset all properties to their default values.
*/
public void reset(ActionMapping mapping, HttpServletRequest request) {
this.userName = null;
}

/**
* Validate the properties posted in this request. If validation errors are
* found, return an <code>ActionErrors</code> object containing the errors.
* If no validation errors occur, return <code>null</code> or an empty
* <code>ActionErrors</code> object.
*/
public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {

ActionErrors errors = new ActionErrors();

if ((userName == null) || (userName.length() < 1))
errors.add("username", new ActionMessage("hello.no.username.error"));

return errors;
}
}

现在的情况是错误输入时：提示

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

大家救命啊，这个是什么毛病呢？？

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xunyiren 2004-09-22

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sorry,看这个

struts-config.xml==><action-mappings>标记中对应path="/HelloWorld"的<action/>标记里,配属性
validate="true" input="/yourinput.jsp"

xunyiren 2004-09-22

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struts-config.xml==><action-mappings>标记中对应path="/HelloWorld"的<action/>标记里,配属性
validat="true" input="/yourinput.jsp"

discolt 2004-09-22

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org.apache.jasper.JasperException 编译错误

treeroot 2004-09-22

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估计是编译错误

lovehuangyuan 2004-09-22

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关注

Arqui 2004-09-22

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顶上去！！！求更多建议

Arqui 2004-09-22

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ok ! let me hv a try.

shangqiao 2004-09-22

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你在你的ActionForm加上几条语句，看看到底你的userName等于什么，可以将form的method设为get以方便调试

Arqui 2004-09-22

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按要求设置完还是不能返回，xunyiren！！帮帮我！加我MSN：arqui2004@hotmail.com希望和你成为朋友

Arqui 2004-09-22

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我的struts-config是这个样子的：

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">



<struts-config>


<form-beans>
<form-bean name="HelloForm" type="hello.HelloForm"/>
</form-beans>


<action-mappings>

<action path = "/HelloWorld"
type = "hello.HelloAction"
name = "HelloForm"
scope = "request"
validate = "true"
input = "/hello.jsp"
>
<forward name="SayHello" path="/hello.jsp" />
</action>
</action-mappings>


<message-resources parameter="com.youcompany.struts.ApplicationResources" />
</struts-config>