java評論、回復功能設計與實現方法
最近實現瞭評論和回復、點贊、@的功能。在這裡分享一下我的設計思路（先分享評論和回復功能）。希望各位讀者給出一些不一樣的建議後期改進。
效果展示
總共是兩層回復 （回復評論、回復評論下的回復）
數據庫設計
評論表（TFW_Comments）和回復內容表（TFW_UserResponse）以及評論回復關系表（TFW_MsgRelation）
數據庫設計思路：
註：各位讀者自動忽略評論表的服務機構ID字段，這個字段相當於這條評論是在哪個帖子（文章下面）
1、根據文章ID或者是帖子ID查詢評論表獲取評論（本文的服務機構ID）。第一層（評論）
2、根據評論ID並且回復類型等於1的去關系表獲取第二層的回復（commentsId）。第二層（評論下的回復）
3、根據評論ID、回復類型等於2、回復ID去關系表獲取第三層回復。第三層（評論下回復中的回復）註：回復ID是它的上級
實現類源碼
@Override
public Map<String, Object> findComments(JSONObject jsonObject) {
data.clear();
String userId = jsonObject.getString("userId");
String role = this.role(jsonObject);
if (role.equals("-1")){
//沒有權限
data.put("error","-1");
data.put("msg","當前用戶沒有權限");
return data;
}
List<Map<String, Object>> info = commentsDao.findComment(jsonObject.getString("fWJLID"),null);
//查詢點贊次數
int countTag = 0;
MsgRelationTag msgRelationTag = new MsgRelationTag();
for (Map item : info){
item.put("inputShow",false);
int commentsId = (int) item.get("commentsId");
//查詢點贊次數
countTag = msgRelationDao.findCountTagByTagId(commentsId,1);
item.put("countTag",countTag);
//設置點贊狀態
msgRelationTag.setTagId(commentsId);
msgRelationTag.setTagType(1);
msgRelationTag.setTagUserId(Integer.parseInt(userId));
MsgRelationTag msgTag = msgRelationDao.findMsgTag(msgRelationTag);
if (msgTag != null) {
item.put("tagStatus",msgTag.getStatus());
}else {
item.put("tagStatus","");
}
//如果有@id
if (item.get("atId") != null){
String content = item.get("content").toString();
StringBuffer tmrAtId = findUserName(item.get("atId").toString());
item.put("content",content+'@'+tmrAtId);
}
//二級回復數據
List<Map<String, Object>> twoReply = new ArrayList<>();
//所有數據
List<Map<String, Object>> userResponse = userResponseDao.findUserResponse(commentsId, null, "","",null);
for (Map userResponseInfo :userResponse){
int userResponseIds = Integer.parseInt(userResponseInfo.get("userResponseId").toString());
//查詢點贊次數
countTag = msgRelationDao.findCountTagByTagId(userResponseIds,2);
//設置點贊狀態
msgRelationTag.setTagId(userResponseIds);
msgRelationTag.setTagType(2);
msgTag = msgRelationDao.findMsgTag(msgRelationTag);
if (msgTag != null) {userResponseInfo.put("tagStatus",msgTag.getStatus());}else {userResponseInfo.put("tagStatus","");}
userResponseInfo.put("countTag",countTag);
userResponseInfo.put("inputShow",false);
Integer responseType = (Integer) userResponseInfo.get("responseType");
for (Map stairReplyInfo : userResponse){
Integer userResponseId = (Integer) stairReplyInfo.get("userResponseId");
int msgRelationId = Integer.parseInt(stairReplyInfo.get("msgRelationId").toString());
//接受者id*/
twoReply = userResponseDao.findUserResponse(msgRelationId, userResponseId,"1","",null); //二級回復數據
for (Map twoReplyItem : twoReply){
int twoReplyId = Integer.parseInt(twoReplyItem.get("userResponseId").toString());
twoReplyItem.put("inputShow",false);
//查詢點贊次數
countTag = msgRelationDao.findCountTagByTagId(twoReplyId,2);
twoReplyItem.put("countTag",countTag);
//設置點贊狀態
msgRelationTag.setTagId(twoReplyId);
msgTag = msgRelationDao.findMsgTag(msgRelationTag);
if (msgTag != null) {twoReplyItem.put("tagStatus",msgTag.getStatus());}else {twoReplyItem.put("tagStatus","");}
String userRepContent = twoReplyItem.get("userRepContent").toString();
if (twoReplyItem.get("tmrAtId") != null){
StringBuffer tmrAtId = findUserName(twoReplyItem.get("tmrAtId").toString());
twoReplyItem.put("userRepContent",userRepContent+'@'+tmrAtId);
}
}
stairReplyInfo.put("twoReply",twoReply);
}
}
item.put("stairReply",userResponse);
}
data.put("data",info);
data.put("error",0);
data.put("msg","查詢成功");
return data;
}
其它的代碼可以忽略。主要語句有：
獲取帖子下的評論
List<Map<String, Object>> info = commentsDao.findComment(jsonObject.getString("fWJLID"),null);
上圖根據FWJLID獲取評論。（此處可以當成帖子的ID，獲取帖子下的評論）一級展示
對應SQL語句（OPT是我的用戶表）
select tc.content ,tc.commentsId,convert(varchar(19),tc.startTime,120) as startTime,tc.recipientId ,tc.operatorId,zo.NAME as operatorName,tc.atId,zo.HeadImgUrl as operatorHeadImgUrl
from TFW_Comments tc
left join zd_opt zo on zo.AID = tc.operatorId where tc.FWJLID = 5101
查詢結果：
獲取評論下的回復
List<Map<String, Object>> userResponse = userResponseDao.findUserResponse(commentsId, null, "","",null);
上圖根據commentsid獲取評論下的回復。（根據評論ID獲取回復）二級展示
對應sql語句
select
tur.userResponseId,tur.operatorId,tur.recipientId,convert(varchar(19),tur.startTime,120) as startTime,tur.userRepContent,tmr.atId as tmrAtId,
tmr.msgRelationId ,tmr.responseType,tmr.replyId,
zo.NAME as operatorName,
zo1.NAME as recipientName,
zo.HeadImgUrl as operatorHeadImgUrl,
zo1.HeadImgUrl as recipientHeadImgUrl
from TFW_MsgRelation tmr
left join TFW_UserResponse tur on tur.userResponseId = tmr.userResponseId
left join zd_opt zo on zo.AID = tur.operatorId
left join zd_opt zo1 on zo1.AID = tur.recipientId where tmr.commentsId = 47
查詢結果
獲取二級回復
twoReply = userResponseDao.findUserResponse(msgRelationId, userResponseId,"1","",null); //二級回復數據
上圖是根據評論ID（msgRelationId）和回復ID（userResponseId）去獲取二級回復。回復ID也就是父類。就是回復那一條回復的ID。 第三層展示
對應sql
select
tur.userResponseId,tur.operatorId,tur.recipientId,convert(varchar(19),tur.startTime,120) as startTime,tur.userRepContent,tmr.atId as tmrAtId,
tmr.msgRelationId ,tmr.responseType,tmr.replyId,
zo.NAME as operatorName,
zo1.NAME as recipientName,
zo.HeadImgUrl as operatorHeadImgUrl,
zo1.HeadImgUrl as recipientHeadImgUrl
from TFW_MsgRelation tmr
left join TFW_UserResponse tur on tur.userResponseId = tmr.userResponseId
left join zd_opt zo on zo.AID = tur.operatorId
left join zd_opt zo1 on zo1.AID = tur.recipientId where tmr.commentsId = 136 and tmr.replyId = 155
查詢結果
返回頁面展示和返回體展示
總結
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