全局異常捕獲

1、我們寫一個Controller，拋出一個異常

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() {
        
        // 此處拋出異常
        int a = 10 / 0;
        return "Hello World!";
    }
}

2、捕獲全局異常類

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 "拋出異常，全局捕獲";
    }
}

注解：@RestControllerAdvice、@ExceptionHandler
注意：@RestControllerAdvice相當於@ControllerAdvice+@ResponseBody
能夠捕獲controller層拋出的異常。

3、應用啟動類

package com.javasgj.springboot.globalexception;

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

/**
 * spring boot應用啟動類
 */
@SpringBootApplication
public class Application {

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

4、瀏覽器輸入：http://127.0.0.1:8080/hello
輸出：拋出異常，全局捕獲
說明成功了！