java的异常处理

1、springMVC的异常处理

@ControllerAdvice注解例子：

@ControllerAdvice(basePackages = {"com.caiya.ucenter.rest.web.views"})
@ControllerAdvice(assignableTypes = {UserController.class})

更多使用方式参考spring的注解类：

org.springframework.web.bind.annotation.ControllerAdvice

返回视图：

package com.caiya.ucenter.rest.web;

import com.alibaba.dubbo.remoting.TimeoutException;
import com.caiya.session.SessionException;
import com.caiya.ucenter.rest.web.controllers.UserController;
import com.caiya.ucenter.rest.web.views.EmailBindConfirmController;
import com.caiya.ucenter.service.LoginException;
import org.apache.log4j.Logger;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.ModelAndView;

import java.lang.reflect.UndeclaredThrowableException;

/**
 * 同步异常处理拦截器，使用了{@link ControllerAdvice}注解
 */
@ControllerAdvice(basePackages = {"com.caiya.ucenter.rest.web.views"})
public class ErrorHandler {

   private static Logger logger = Logger.getLogger(ErrorHandler.class);
   
    @ExceptionHandler(value = Exception.class)
    @ResponseStatus(HttpStatus.OK)
    public ModelAndView errorResponse(WebRequest request, Exception e) {
      logger.error(e.getMessage());
      ResponseDataWrapper<?> result = null;
      if(e instanceof IllegalArgumentException){
         result = ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_ARGUMENT, new StringBuilder("").append(e.getMessage()).toString()));
      }else if(e instanceof LoginException){
         result = ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_LOGIN, new StringBuilder("").append(e.getMessage()).toString()));
      }else if(e instanceof IllegalAccessException){
         result = ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_ACCESS, new StringBuilder("").append(e.getMessage()).toString()));//非法访问:
      }else if(e instanceof NullPointerException){
         result = ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_NULL, new StringBuilder("").append(e.getMessage()).toString()));
      }else if(e instanceof TimeoutException){
         result = ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_NULL, new StringBuilder("请求超时，请稍后重试！").append(e.getMessage()).toString()));
      }else if(e instanceof SessionException){//用户会话失效！
         result = ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_LOGIN, new StringBuilder("").append(e.getMessage()).toString()));
      }else if(e instanceof UndeclaredThrowableException){//权限
         result = ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_ACCESS, new StringBuilder("非法访问！").toString()));//非法访问:
      }else {
         result = ResponseDataWrapperBuilder.build(request, ErrorInfo.buildSystemError("系统异常，请稍后重试！"));
      }
      ModelAndView modelAndView = new ModelAndView("errorpage/500");
      modelAndView.addObject("result", result);
      return modelAndView;
    }
}

返回json：

package com.caiya.ucenter.rest.web;

import java.lang.reflect.UndeclaredThrowableException;

import com.caiya.session.SessionException;
import com.caiya.ucenter.rest.web.controllers.UserController;
import com.caiya.ucenter.rest.web.views.EmailBindConfirmController;
import org.apache.log4j.Logger;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.context.request.WebRequest;

import com.alibaba.dubbo.remoting.TimeoutException;
import com.caiya.ucenter.service.LoginException;

/**
 * 异步异常处理拦截器，使用了{@link ControllerAdvice}注解
 */
@ControllerAdvice(basePackages = {"com.caiya.ucenter.rest.web.controllers"})
public class RestErrorHandler {

   private static Logger logger = Logger.getLogger(RestErrorHandler.class);
   
    @ExceptionHandler(value = Exception.class)
    @ResponseStatus(HttpStatus.OK)
    @ResponseBody
    public ResponseDataWrapper<?> errorResponse(WebRequest request, Exception e) {
      logger.error(e.getMessage());
      if(e instanceof IllegalArgumentException){
         return ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_ARGUMENT, new StringBuilder("").append(e.getMessage()).toString()));
      }
      if(e instanceof LoginException){
         return ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_LOGIN, new StringBuilder("").append(e.getMessage()).toString()));
      }
      if(e instanceof IllegalAccessException){
         return ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_ACCESS, new StringBuilder("").append(e.getMessage()).toString()));//非法访问:
      }
      if(e instanceof NullPointerException){
         return ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_NULL, new StringBuilder("").append(e.getMessage()).toString()));
      }
      if(e instanceof TimeoutException){
         return ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_NULL, new StringBuilder("请求超时，请稍后重试！").append(e.getMessage()).toString()));
      }
      if(e instanceof SessionException){//用户会话失效！
         return ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_LOGIN, new StringBuilder("").append(e.getMessage()).toString()));
      }
      if(e instanceof UndeclaredThrowableException){//权限
         return ResponseDataWrapperBuilder.build(request, new ErrorInfo(ErrorInfo.ERROR_ACCESS, new StringBuilder("非法访问！").toString()));//非法访问:
      }
        return ResponseDataWrapperBuilder.build(request, ErrorInfo.buildSystemError("系统异常，请稍后重试！"));   }
}