Merge branch 'feature_log' of algorithm/recommend-server into master

recommend-server-service/src/main/java/com/tzld/piaoquan/recommend/server/util/JSONUtils.java

@@ -2,6 +2,7 @@ package com.tzld.piaoquan.recommend.server.util;
 
 import com.alibaba.fastjson.JSONObject;
 import com.google.common.reflect.TypeToken;
+import com.google.gson.Gson;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
 
@@ -14,7 +15,7 @@ public class JSONUtils {
             return "";
         }
         try {
-            return JSONObject.toJSONString(obj);
+            return new Gson().toJson(obj);
         } catch (Exception e) {
             log.error("toJson exception", e);
             return "";