package com.example.demo.exception;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.HashMap;
import java.util.Map;

/**
 * Anny的springboot項目異常類
 */
@ControllerAdvice
public class MyControllerAdvice {

    /**
     * 全局捕获异常类，
     *      · 只作用在RequestMapping方法上，所有的异常信息都会被捕获
     * @param ex
     * @return
     */
    @ResponseBody
    @ExceptionHandler(value = Exception.class)
    public Map<String,Object> errorHandler(Exception ex){
        Map<String,Object> map = new HashMap<>();
        map.put("code",-1);
        map.put("msg",ex.getMessage());
        return map;
    }

    /**
     * 自定义异常
     * @param ex
     * @return
     */
    @ResponseBody
    @ExceptionHandler(value = BusinessException.class)
    public Map<String,Object> errorBusinessHandler(BusinessException ex){
        Map<String,Object> map = new HashMap<>();
        map.put("code",ex.getCode());
        map.put("msg",ex.getMsg());
        return map;
    }

}

package com.example.demo.exception;

/**
 * 自定义异常类
 */
public class BusinessException extends RuntimeException {

    private int code;
    private String msg;

    public BusinessException(int code, String msg) {
        super();
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}

package com.example.demo.controller;

import com.example.demo.exception.BusinessException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
@RequestMapping("/hello")
public class HelloController {

    private static Logger logger = LoggerFactory.getLogger(HelloController.class);

    @Value("${anny.msg}")
    private String msg;

    @RequestMapping("/springBoot")
    public String Hello(){
        //系统异常
//        int no = 1/0;
//        return msg;
        //自定义异常
        throw new BusinessException(999999999,"你瞅啥");
    }
}