Write a unified exception handling class under Spring

Unified exception handling

• @ControllerAdvice
• 1), write exception handling class, use @ControllerAdvice.
• 2) Use @ExceptionHandler to annotate the exceptions that can be handled.
• The first step: extract an exception handling class ExceptionControllerAdvice:

/**
*集中处理异常
*/
//注明此异常处理类需要处理哪个包出现的异常
@RestControllerAdvice(basePackages = "com.controller")
/*@org.springframework.web.bind.annotation.ControllerAdvice*/
public class ControllerAdvice {
    
    
	//感知异常ExceptionHandler,告诉SpringMVC此方法可以处理哪些异常
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public R handleValidException(MethodArgumentNotValidException e){
    
    
        log.error("数据校验出现问题{},异常类型{}",e.getMessage(),e.getClass());
        BindingResult bindingResult = e.getBindingResult();
        Map<String, String> errorMap = new HashMap<>();
        bindingResult.getFieldErrors().forEach((fieldError)->{
    
    
            errorMap.put(fieldError.getField(),fieldError.getDefaultMessage());
        });
        return R.error(BizCodeEnume.VAILD_EXCEPTION.getCode(),BizCodeEnume.VAILD_EXCEPTION.getMsg()).put("data",errorMap);
    }
    @ExceptionHandler(value = Throwable.class)
    public R handleException(Throwable t){
    
    
        return R.error(BizCodeEnume.UNKNOW_EXCEPTION.getCode(),BizCodeEnume.UNKNOW_EXCEPTION.getMsg());
    }
}

Note: The first method to pass the parameter MethodArgumentNotValidException is an exception reported by my project, and the second method handles all exceptions.

BizCodeEnume class (specify error code and error message):

public enum BizCodeEnume {
    
    
    UNKNOW_EXCEPTION(10000,"系统未知异常"),
    VAILD_EXCEPTION(10001,"参数格式校验失败");
    private int code;
    private String msg;
    BizCodeEnume(int code,String msg){
    
    
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
    
    
        return code;
    }

    public String getMsg() {
    
    
        return msg;
    }
}