java web异常处理方式总结-蒲公英云

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>