set up 2

src/main/java/com/example/freshonline/utils/responseUtils/Message.java

-package com.example.freshonline.utils.responseUtils;
-
-public enum Message {
-
-    ADD_SUCCESS("add successful"),
-    MOD_SUCCESS("modify successful"),
-    ADD_FAIL("add failed"),
-    ;
-
-
-    private String msg;
-
-    Message(String msg){
-        this.msg = msg;
-    }
-}

src/main/java/com/example/freshonline/utils/responseUtils/RespBuilder.java

-package com.example.freshonline.utils.responseUtils;
-
-import com.alibaba.fastjson.JSONObject;
-
-public class RespBuilder {
-
-    private final static String code = "code";
-    private final static String msg = "msg";
-    private final static String data = "data";
-
-
-
-
-}

src/main/java/com/example/freshonline/utils/responseUtils/ValidRespRule.java

-package com.example.freshonline.utils.responseUtils;
-
-public enum ValidRespRule {
-
-    COLLECTION_NOT_EMPTY(0),
-    OBJECT_NOT_NULL(1),
-    BOOLEAN(2),
-    ;
-
-
-    private int rule_id;
-
-    ValidRespRule(int rule_id) {
-        this.rule_id = rule_id;
-    }
-}