Json 响应对象

Json 响应对象

封装响应对象，携带额外信息

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class R<T> implements Serializable {
    static final long serialVersionUID = 422344123L;
    /**
     * 操作是否成功
     */
    private boolean success = false;
    /**
     * 响应码
     */
    private int code = -1;
    /**
     * 消息
     */
    private String message;
    /**
     * 数据体
     */
    private T data;
    public static <T> R<T> success(T data){
        return new R<>(true, 200, "操作成功", data);
    }
    public static <T> R<T> success(String message, T data){
        return new R<>(true, 200, message, data);
    }
    @Deprecated
    public static R<Object> failure(int code, String message){
        return new R<>(false, code, message, null);
    }
    public static R<Object> failure(Code code){
        return new R<>(false, code.code, code.message, null);
    }
    public static R<Object> failure(Code code, String message){
        return new R<>(false, code.code, String.format("%s: %s", code.message, message), null);
    }
    public static <T> R<T> failure(Code code, String message, T data){
        return new R<>(false, code.code, String.format("%s: %s", code.message, message), data);
    }
    public enum Code{
        //操作成功请使用success
        //OK(200, "成功"),
        HEADER_REQUIRED(10000, "请提供请求头"),
        DATA_NOT_EXISTS(10001, "数据不存在"),
        DATA_ALREADY_EXISTS(10002, "数据重复"),
        DATA_HAS_BEEN_REFERENCE(10003, "引用约束"),
        INVALID_PARAMS(20001, "无效参数"),
        ILLEGAL_PARAMS(20002, "非法参数"),
        ILLEGAL_STATE(20003, "非法状态"),
        TOKEN_REQUIRED(40001, "未提供Token"),
        HAS_NO_PERMISSION(40003, "无权访问"),
        FLOW_LIMITED(40010, "接口限流"),
        INVALID_TOKEN(44001, "Token无效或已过期"),
        SYSTEM_ERROR(50000, "系统错误"),
        UNKNOWN_ERROR(-1, "异常");
        final int code;
        final String message;
        Code(int code, String message){
            this.code = code;
            this.message = message;
        }
    }
}