springboot 全局异常处理和统一响应对象的处理方式

@RestController
public class ExceptionController {
    @GetMapping("exceptionA")
    public void methodA() {
        try {
            int a = 100 / 0;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

   @RestController
   public class ExceptionController {
   
       @GetMapping("exceptionA")
       public void methodA() {
           int a = 100 / 0;
       }
   
       
       @ExceptionHandler(Exception.class)
       public String exHandler(Exception e) {
           // 判断发生异常的类型是除0异常则做出响应
           if (e instanceof ArithmeticException) {
               return "发生了除0异常";
           }
           // 未知的异常做出响应
           return "发生了未知异常";
       }
   }

@RestControllerAdvice
public class DefaultException {
​
    @ExceptionHandler({NullPointerException.class})
    public String exception(NullPointerException exception) {
        return "空指针异常";
​
    }
​
    @ExceptionHandler({IndexOutOfBoundsException.class})
    public String exception(IndexOutOfBoundsException exception) {
        return "数组越界异常";
    }
}

@RestController
public class ExceptionController {
​
    @GetMapping("exceptionA")
    public void methodA() {
        int a = 100 / 0;
    }
​
    @GetMapping("exceptionB")
    public void methodB() {
        List list = new ArrayList<>();
        System.out.println(list.get(0));
    }
​
    
    //@ExceptionHandler(Exception.class)
    //public String exHandler(Exception e) {
    //    // 判断发生异常的类型是除0异常则做出响应
    //    if (e instanceof ArithmeticException) {
    //        return "发生了除0异常";
    //    }
    //    // 未知的异常做出响应
    //    return "发生了未知异常";
    //}
}

@Data
@NoArgsConstructor
public class CustomException extends Exception {
​
    private static final long serialVersionUID = 1L;
​
    private Integer code;
​
    private String mes;
​
    
    public CustomException(Integer code, String msg) {
        super(msg);
        this.code = code;
    }
}

@GetMapping("exceptionC")
public void methodC() throws CustomException {
    int a = 1;
    if (a == 1) {
        throw new CustomException(10086, "自定义异常");
    }
}

@Data
@NoArgsConstructor
@AllArgsConstructor
public class R<T> {
    
    private Integer code;
    
    private String msg;
    
    private T data;
​
    public static R success() {
        return new R(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getMsg(), null);
    }
​
    public static R success(Object data) {
        return new R(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getMsg(), data);
    }
​
    public static R failed() {
        return new R(ResultCode.FAILED.getCode(), ResultCode.FAILED.getMsg(), null);
    }
​
    public static R failed(String msg) {
        return new R(ResultCode.FAILED.getCode(), msg, null);
    }
​
    public static R failed(int code, String msg) {
        return new R(code, msg, null);
    }
}

@NoArgsConstructor
@AllArgsConstructor
public enum ResultCode {
​
    SUCCESS(200, "请求成功"),
    FAILED(500, "服务器错误");
​
    private int code;
    private String 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;
    }
}

@RestControllerAdvice
public class DefaultException {
    @ExceptionHandler({CustomException.class})
    public R exception(CustomException e) {
        return R.failed(e.getCode(),e.getMessage());
    }

    @ExceptionHandler({Exception.class})
    public R exception(Exception e) {
        return R.failed(e.getMessage());
    }
}