1.创建一个枚举类，指定错误代码以及错误消息

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;public int getCode() {return code;}public String getMsg() {return msg;}BizCodeEnume(int code, String msg) {this.code = code;this.msg = msg;}
}

2.创建异常处理类

import com.atguigu.common.exception.BizCodeEnume;
import com.atguigu.common.utils.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.*;import java.util.HashMap;
import java.util.Map;/*** 集中处理所有异常*/
@Slf4j
//@ResponseBody
//@ControllerAdvice(basePackages = "com.atguigu.gulimall.product.controller")
@RestControllerAdvice
public class GulimallExceptionControllerAdvice {@ExceptionHandler(value = MethodArgumentNotValidException.class)public R handVaildException(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 handVaildException(Throwable throwable){return R.error(BizCodeEnume.UNKNOW_EXCEPTION.getCode(),BizCodeEnume.UNKNOW_EXCEPTION.getMsg());}
}