java web异常处理方式总结

在网上找了一下午的资料,终于清楚地了解在struts2+hibernate3+spring3下比较完善的异常处理方式,有借鉴的东西,也有些是自己修改后的东东,废话不多说了,看下图:

需要的东东有:Action类、service类、异常拦截器ExceptionFilter、自定义异常类MyException、错误跳转页面error.jsp

首先,Action类

/**
	 * 查询机票
	 * @return
	 * @throws MyException 
	 * @throws Exception
	 */
	public String searchTicket() throws MyException
	{
		try {
			baseService.findFlightInfos(searchTicketDto);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			throw new MyException(101);// 抛出自定义异常
		}
		return "success";
	}

 以上baseService.findFlightInfos方法的关键代码

public List<FlightInfoDto> findFlightInfos(FlightInfoDto dto) {
		// TODO Auto-generated method stub
		int i = 5/0;// 此条语句作为测试
		try{
			// 数据库操作或一般操作
		} catch (Exception e) {
			// TODO Auto-generated catch block
		}
		return result;
	}

 接下来,异常拦截器ExceptionFilter

 

/**
 * 
 */
package com.ab.permission.Filter;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.sql.SQLException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.StrutsStatics;
import org.springframework.dao.DataAccessException;

import com.ab.permission.exception.MyException;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import com.opensymphony.xwork2.interceptor.StaticParametersInterceptor;
import com.sun.org.apache.commons.logging.Log;
import com.sun.org.apache.commons.logging.LogFactory;

/**
 * 功能描述:异常拦截器
 * 
 * @author: LRR
 * @date: 2014-04-07 下午05:09:25
 */
public class ExceptionFilter extends AbstractInterceptor {

	private HttpServletRequest request;
	private HttpSession session;
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * 功能描述:异常拦截器,对异常进行相关处理
	 */
	@Override
	public String intercept(ActionInvocation actioninvocation) throws Exception {
		request = ServletActionContext.getRequest(); 
		String result = null; // Action的返回值  
		 String errorMsg = "未知错误!";
	        try {  
	            // 运行被拦截的Action,期间如果发生异常会被catch住  
	            result = actioninvocation.invoke();  
	            return result;  
	        }
	        catch (DataAccessException ex) {
	        	 errorMsg = "数据库操作失败"; 
			} catch (NullPointerException ex) {
				errorMsg = "调用了未经初始化的对象或者是不存在的对象";
			} catch (IOException ex) {
				errorMsg = "IO异常";
			} catch (ClassNotFoundException ex) {
				errorMsg = "指定的类不存在";
			} catch (ArithmeticException ex) {
				errorMsg = "数学运算异常";
			} catch (ArrayIndexOutOfBoundsException ex) {
				errorMsg = "数组下标越界";
			} catch (IllegalArgumentException ex) {
				errorMsg = "方法的参数错误";
			} catch (ClassCastException ex) {
				errorMsg = "类型强制转换错误";
			} catch (SecurityException ex) {
				errorMsg = "违背安全原则异常";
			} catch (SQLException ex) {
				errorMsg = "操作数据库异常";
			} catch (NoSuchMethodError ex) {
				errorMsg = "方法末找到异常";
			} catch (InternalError ex) {
				errorMsg = "Java虚拟机发生了内部错误";
			} catch (InvocationTargetException ex) {
				errorMsg = "程序内部错误,操作失败,";
			} catch (MyException e) {
	            e.printStackTrace(); //开发时打印异常信息,方便调试  
	            errorMsg = e.getMessage().trim(); 
	        } catch (Exception ex) {
	        	errorMsg = "程序内部错误,操作失败,";
			}
	        errorMsg = "错误信息:"+errorMsg;
	        /** 
             * 发送错误消息到页面 
             */  
            request.setAttribute("tip", errorMsg);  
            return "error";
	}

}

 错误跳转页面error.jsp

 

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>出错了</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
   ${ tip } <br>
  </body>
</html>

 最后就是struts.xml了

 

<global-results>
          <result name="error">/error.jsp</result> 
</global-results>
        <!-- 定义全局异常映射 -->
		<global-exception-mappings>
			<exception-mapping result="error" exception="java.lang.Exception"></exception-mapping>
		</global-exception-mappings>

 <interceptors>
            <interceptor name="exceptionManager" class="com.ab.permission.Filter.ExceptionFilter"/>
            <interceptor-stack name="authorityStack">
                <interceptor-ref name="defaultStack" />
                </interceptor-ref>
                <interceptor-ref name="exceptionManager" />
            </interceptor-stack>
        </interceptors>

 至此工作已做完,最后测试结果可自行测试。

 

 

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