SpringBoot------全局异常捕获

1.添加异常类

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...";
    }
}

2.添加启动类

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);
    }
}