传入一个Map<String,Long> 返回它按value排序后的结果

    //传入一个Map<String,Long>  返回它按value排序后的结果 sort为正序还是倒序（-1倒序），size为要几条数据
     private static Map<String, Long> sortMapByValues(Map<String, Long> aMap, int sort, int size) {

         Set<Map.Entry<String, Long>> mapEntries = aMap.entrySet();

         List<Map.Entry<String, Long>> aList = new LinkedList<Map.Entry<String, Long>>(mapEntries);

         Collections.sort(aList, new Comparator<Map.Entry<String, Long>>() {

             @Override
             public int compare(Map.Entry<String, Long> ele1,
                                Map.Entry<String, Long> ele2) {
                 if (sort < 0) {
                     return ele2.getValue().compareTo(ele1.getValue());
                 }
                 return ele1.getValue().compareTo(ele2.getValue());
             }
         });
         // Storing the list into Linked HashMap to preserve the order of insertion.
         Map<String, Long> aMap2 = new LinkedHashMap<String, Long>();
         for (Map.Entry<String, Long> entry : aList) {
             aMap2.put(entry.getKey(), entry.getValue());
             if (aMap2.size() == size) {
                 break;
             }
         }
         return aMap2;
     }