struts2抛自定义异常错误问题

我将代码贴出来
目录结构
自定义异常:
PasswordException.java
 

Java code

package exception;public class PasswordException extends Exception { private static final long serialVersionUID = 8194779832109312113L; private String message;  public PasswordException(String message) {  super( message );  this.message = message; } public String getMessage() {  return message; } public void setMessage(String message) {  this.message = message; }  }

UsernameException.java源代码
 

Java code

package exception;public class UsernameException extends Exception { private static final long serialVersionUID = 5926837471651227661L; private String message;  public UsernameException(String message) {  super( message );  this.message = message; } public String getMessage() {  return message; } public void setMessage(String message) {  this.message = message; } }

Login.java源代码
 

Java code

package test;import com.opensymphony.xwork2.ActionSupport;import exception.PasswordException;import exception.UsernameException;public class Login extends ActionSupport{ private static final long serialVersionUID = 1L; private String username; private String password;  public String getUsername() {  return username; } public void setUsername(String username) {  this.username = username; } public String getPassword() {  return password; } public void setPassword(String password) {  this.password = password; }  public String execute () throws Exception {   if ( !"hello".equals(this.getUsername().trim()) ){  throw new UsernameException( "username" );  } else if ( !"world".equals(this.getPassword().trim()) ){  throw new PasswordException( "password" );  }else{  return SUCCESS;  }  //  if ( "hello".equals(this.getUsername().trim()) && "world".equals(this.getPassword().trim())){//  return "success";//  } else {//  this.addFieldError( "username" , "用户名或密码错误，请重新输入。" );//  this.setUsername( "" );//  this.setPassword( "" );//  return "failer";//  } }// public void validate() {//  if ( (null == this.getUsername()) || ("".equals(this.getUsername().trim())) ){//  this.addFieldError( "username" , "用户名不能为空。" );//  }//  if ( (null == this.getPassword()) || ("".equals(this.getPassword().trim())) ){//  this.addFieldError( "password" , "密码不能为空。" );//  }// } }

sturts.xml源代码
 

XML code

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.custom.i18n.resources" value="message"> </constant> <package name="struts2" extends="struts-default">  <action name="login" class="test.Login">  <exception-mapping result="username"   exception="test.UsernameException">  </exception-mapping>  <result name="username">/username.jsp</result>  <exception-mapping result="password"   exception="test.PasswordException">  </exception-mapping>  <result name="password">/password.jsp</result>  <result name="success">/result.jsp</result>  </action> </package></struts>

web.xml源代码
 

XML code

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"  xmlns="http://java.sun.com/xml/ns/javaee"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter>  <filter-name>struts2</filter-name>  <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> </filter> <filter-mapping>  <filter-name>struts2</filter-name>  <url-pattern>/*</url-pattern> </filter-mapping></web-app>