1、我们写一个Controller，抛出一个异常

package com.javasgj.springboot.globalexception;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloWorldController {

    @RequestMapping(value="/hello")
    public String hello() {
        
        // 此处抛出异常
        int a = 10 / 0;
        return "Hello World!";
    }
}

2、捕获全局异常类

package com.javasgj.springboot.globalexception;

import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    public String exception() {
        
        return "抛出异常，全局捕获";
    }
}

注解：@RestControllerAdvice、@ExceptionHandler
注意：@RestControllerAdvice相当于@ControllerAdvice+@ResponseBody
能够捕获controller层抛出的异常。

3、应用启动类

package com.javasgj.springboot.globalexception;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * spring boot应用启动类
 */
@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        
        SpringApplication.run(Application.class, args);
    }
}

4、浏览器输入：http://127.0.0.1:8080/hello
输出：抛出异常，全局捕获
说明成功了！