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！")); }
}