package myshop.config;

import javax.servlet.http.HttpServletRequest;

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.servlet.ModelAndView;

/*

 * 1.新建一个class,这里取名为GlobalDefaultExceptionHandler

 * 2.在class上添加注解，@ControllerAdvice

 * 3.在class中添加一个方法

 * 4.在方法上添加@ExcetionHandler拦截相应的异常

 * 5.如果返回的是View -- 方法返回值是ModelAndView

 * 6.如果返回的是String或者是Json数据，那么需要在方法上添加@RequestBody注解

 */

@ControllerAdvice

public class GlobalDefaultExceptionHandler {

    @ExceptionHandler(Exception.class)

    @ResponseBody

    public String defaultExceptionHandler(HttpServletRequest req, Exception e)

    {

        //ModelAndView mv = new ModelAndView();

        //mv.setViewName("");

        return "对不起，服务器繁忙...";

    }

}

package myshop;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class App {

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        SpringApplication.run(App.class, args);

    }

}