Merge branch 'mlbWork' into 'master'

采集导语以第一次采集到的导语为准

See merge request !56

src/main/java/com/zhiwei/searchhotcrawler/dao/HotSearchCacheDAO.java

@@ -9,6 +9,7 @@ import com.zhiwei.searchhotcrawler.config.DBConfig;
 import com.zhiwei.searchhotcrawler.crawler.WeiboHotSearchCrawler;
 import com.zhiwei.searchhotcrawler.dbtemplate.MongoDBTemplate;
 import lombok.extern.log4j.Log4j2;
+import org.apache.logging.log4j.util.Strings;
 import org.bson.Document;
 
 import java.util.ArrayList;
@@ -298,8 +299,10 @@ public class HotSearchCacheDAO  {
         Document query = new Document("_id", id);
         Document nowDoc = (Document) collection.find(query).first();
         if (Objects.nonNull(nowDoc)) {
-            if(document.containsKey("topicLead") && document.getString("topicLead") != null) {
-                nowDoc.put("topicLead", document.getString("topicLead"));
+            if(Objects.isNull(nowDoc.get("topicLead"))) {
+                if (document.containsKey("topicLead") && document.getString("topicLead") != null) {
+                    nowDoc.put("topicLead", document.getString("topicLead"));
+                }
             }
             if(document.containsKey("readCount") && document.containsKey("discussCount")) {
                 nowDoc.put("readCount", document.getInteger("readCount"));