Struts2学习之十五-声明式的异常处理

whp0731 · 发表于 2013-2-7 16:03:22

看下文前可以先参考：
http://blog.chinaunix.net/u2/84280/showart_1728277.html

package com.test.exception;public class UsernameException extends Exception{ 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; }  } 声明式的异常处理

1、类

package com.test.exception;public class PasswordException extends Exception{ 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; }}

2、action类修
public String execute() throws Exception {  //username invalid  if(!"hello".equals(this.getUsername()))  { throw new UsernameException("username invalid");  }  //password invalid  else if(!"world".equals(this.getPassword()))  { throw new PasswordException("password invalid");  }  else  { return SUCCESS;  }}
3、修改struts.xml
全局配置方式：

<global-results> <result name="passwordInvalid">/passwordInvalid.jsp</result>  </global-results>    <global-exception-mappings> <exception-mapping result="passwordInvalid" exception="com.test.exception.PasswordException"></exception-mapping>  </global-exception-mappings>局部配置方法：  <action name="login" class="com.test.action.LoginAction"> <exception-mapping result="usernameInvalid" exception="com.test.exception.UsernameException"></exception-mapping>    <result name="success">/result.jsp</result> <result name="usernameInvalid">/usernameInvalid.jsp</result>  </action>
4、新增jsp页面
1）usernameInvalid.jsp（举例用EL表达式）
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=GB18030"><title>Insert title here</title></head><body>${exception.message }</body></html>
2)passwordInvalid(也可以打印堆栈信息)
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=GB18030"><title>Insert title here</title></head><body><s:property value="exceptionStack"/></body></html>

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