springboot中实现全局异常处理

package com.quanzhan.excep;

import com.quanzhan.entity.CommonResult;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@ControllerAdvice
@ResponseBody  //表示返回的对象，Spring会自动把该对象进行json转化，最后写入到Response中,并返回到异常页面。
public class GlobalExceptionHandler {

    //定义错误时候跳转的视图.底层会自动拼接
    public static final String ERROR_VIEW = "pages/error/error";

    
    @ExceptionHandler(Exception.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Object handleException(HttpServletRequest request,
                                  HttpServletResponse response,
                                  Exception e){
        e.printStackTrace();//打印异常
        // 是否ajax请求
        if (isAjax(request)) {
            //如果是ajax的异步请求就返回这个,CommonResult这个类是自定义的链式统一回复异步请求
            return CommonResult.error().setErrorMessage(e.getMessage());
        } else {
            //如果是同步请求,就增加视图跳转,并携带参数
            ModelAndView mav = new ModelAndView();
            mav.addObject("exception", e);
            mav.addObject("url", request.getRequestURL());
            mav.setViewName(ERROR_VIEW);
            return mav;
        }

    }

    
    public static boolean isAjax(HttpServletRequest httpRequest){
        return  (httpRequest.getHeader("X-Requested-With") != null
                && "XMLHttpRequest"
                .equals( httpRequest.getHeader("X-Requested-With")) );
    }
}