修正临时文件一直追加问题

suggest-task/src/main/java/com/secoo/so/suggest/helper/QueryPlanHelper.java

@@ -117,9 +117,11 @@ public class QueryPlanHelper {
         }
         long nowSecond = System.currentTimeMillis()/1000;
         long sevenDays = 3600 * 24 * 7;
+        boolean appendToFile = true;
         if (nowSecond - minTimeStamp > sevenDays) {
             // 文件中最早的时间戳超过7天，全量更新；否则只更新新增的
             if (keywordMap.size() > 0) {
+                appendToFile = false;
                 newWordLines = new ArrayList<>();   // map转存到newWordLines
                 for (Map.Entry<String, Integer> entry : keywordMap.entrySet()) {
                     String line = entry.getKey() + "," + entry.getValue() + "," + nowSecond;
@@ -129,7 +131,7 @@ public class QueryPlanHelper {
             }
         }
         if (newWordLines != null && newWordLines.size() > 0) {
-            FileUtils.saveToFile(newWordLines, queryPlanFile, true);
+            FileUtils.saveToFile(newWordLines, queryPlanFile, appendToFile);
             newWordLines = new ArrayList<>();
         }
     }