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

 1 package com.jun.web.exception;
 2 
 3 import lombok.Data;
 4 
 5 /**
 6  * 基础异常类
 7  */
 8 @Data
 9 public class BaseException extends RuntimeException{
10     //异常码
11     private String code;
12     private String msg;
13     BaseException(){}
14     public BaseException(String code, String msg){
15         this.code=code;
16         this.msg=msg;
17     }
18 }

 

2.自定义异常处理类

 1 package com.jun.web.exception;
 2 
 3 import org.springframework.web.bind.annotation.ControllerAdvice;
 4 import org.springframework.web.bind.annotation.ExceptionHandler;
 5 import org.springframework.web.bind.annotation.ResponseBody;
 6 
 7 import java.util.HashMap;
 8 import java.util.Map;
 9 
10 @ControllerAdvice
11 @ResponseBody
12 public class GlobalExceptionAdviceHandle {
13     /**
14      * 全局异常捕获
15      * @param ex
16      * @return
17      */
18     @ExceptionHandler(value = Exception.class)
19     public Map<String, Object> errorHandle(Exception ex){
20         Map<String, Object> map = new HashMap<>();
21         map.put("code","-1");
22         map.put("msg", ex.getMessage());
23         return map;
24     }
25 
26     /**
27      * 针对BaseException的异常捕获
28      * @param ex
29      * @return
30      */
31     @ExceptionHandler(value = BaseException.class)
32     public Map<String, Object> errorHandle(BaseException ex){
33         Map<String, Object> map = new HashMap<>();
34         map.put("code",ex.getCode());
35         map.put("msg", ex.getMsg());
36         return map;
37     }
38 }

 

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