1，简单封装：
异常类
package com.zkml.hkm.common.exception;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;

@Data
@AllArgsConstructor
@Builder
public class HkmBusinessException extends RuntimeException {

private int code;
private String msg;

}
异常返回枚举类
package com.zkml.hkm.common.exception;

import lombok.AllArgsConstructor;
import lombok.Getter;

/**

• @author hyg

• @date 2021/11/24 17:04
  */
  @Getter
  @AllArgsConstructor
  public enum HkmResponseStatus {

  /**

  • 未知错误
    /
    HKM_UNKNOWN_ERROR(10000, “未知错误”),
    /*
  • 缺少必填参数
    /
    HKM_REQUIRED_PARAM(10001, “缺少必填参数”),
    /*
  • 网络错误
    /
    HKM_NETERROR(10002, “网络错误”),
    /*
  • 担保函生成失败
    */
    HKM_GENERATE_GUARANTEE_LETTER(10003, “担保函生成失败”),
    ;

  private int code;
  private String msg;

}
应用
throw new HkmBusinessException(HkmResponseStatus.HKM_REQUIRED_PARAM.getCode(), HkmResponseStatus.HKM_REQUIRED_PARAM.getMsg());

2，详细封装：
请参考：https://blog.csdn.net/wwq0813/article/details/108849658
https://blog.csdn.net/qq_36892341/article/details/89953748