010 @ControllerAdvice

一：说明

1.说明

　　这个注解是用于写一个异常捕获的处理类。

　　这里介绍全局捕获异常，自定义异常捕获

2.ps

　　在这里，顺便写一下基础的自定义异常类，以后方便用于业务异常继承

二：全局异常捕获

1.处理类

package com.jun.web.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;

@ControllerAdvice
@ResponseBody
public class GlobalExceptionAdviceHandle {
    /**
     * 全局异常捕获
     * @param ex
     * @return
     */
    @ExceptionHandler(value = Exception.class)
    public Map<String, Object> errorHandle(Exception ex){
        Map<String, Object> map = new HashMap<>();
        map.put("code","-1");
        map.put("msg", ex.getMessage());
        return map;
    }

}

2.controller控制类

package com.jun.web.controller;

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

/**
 * 验证异常捕获注解
 */
@RestController
public class MakeErrorController {
    @GetMapping("/global")
    public String calc(){
        int num=3/0;
        return "success";
    }
}

3.访问

　　

三：自定义异常

1.异常基础类

 package com.jun.web.exception;

 import lombok.Data;

 /**
  * 基础异常类
  */
 @Data
 public class BaseException extends RuntimeException{
     //异常码
     private String code;
     private String msg;
     BaseException(){}
     public BaseException(String code, String msg){
         this.code=code;
         this.msg=msg;
     }
 }

2.自定义异常处理类

 package com.jun.web.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;

 @ControllerAdvice
 @ResponseBody
 public class GlobalExceptionAdviceHandle {
     /**
      * 全局异常捕获
      * @param ex
      * @return
      */
     @ExceptionHandler(value = Exception.class)
     public Map<String, Object> errorHandle(Exception ex){
         Map<String, Object> map = new HashMap<>();
         map.put("code","-1");
         map.put("msg", ex.getMessage());
         return map;
     }

     /**
      * 针对BaseException的异常捕获
      * @param ex
      * @return
      */
     @ExceptionHandler(value = BaseException.class)
     public Map<String, Object> errorHandle(BaseException ex){
         Map<String, Object> map = new HashMap<>();
         map.put("code",ex.getCode());
         map.put("msg", ex.getMsg());
         return map;
     }
 }

3.测试

package com.jun.web.controller;

import com.jun.web.exception.BaseException;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 验证异常捕获注解
 */
@RestController
public class MakeErrorController {
    @GetMapping("/global")
    public String calc(){
        int num=3/0;
        return "success";
    }

    @GetMapping("/global/err")
    public String throwErr(){
        throw new BaseException("20000","普通的错误");
    }
}

4.结果