在java中JSON如何进行字典排序

public static void main(String[] args) {
        String str = "{'TI':[{'value':'aa1','count':10},{'value':'aa2','count':15},{'value':'aa3','count':20}]," +
                "'AB':[{'value':'ab','count':110},{'value':'ab2','count':115},{'value':'ab3','count':210}]}";
        JSONArray newArray = new JSONArray();
        JSONObject newJson = new JSONObject();
        try {
            JSONObject obj = new JSONObject(str);
            Iterator it = obj.keys();
            while (it.hasNext()) {
                String key = (String) it.next();
                String value = obj.getString(key);
                JSONArray array = obj.getJSONArray(key);
                for(int i=0;i<array.length();i++){
                    JSONObject jsonobject = array.getJSONObject(i);
                    jsonobject.put("name", key);
                    jsonobject.put("exp", key+"="+jsonobject.getString("value"));
                    newArray.put(jsonobject);
                }
            }
            newJson.put("groups",newArray);
            System.out.println(newJson);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

解析json
然后排序

 JSONArray mJSONArray;

protected void sortJsonArrayByDate(String dateName){
    List<JSONObject> list = new ArrayList<JSONObject> ();
    JSONObject jsonObj = null;
    for (int i = 0; i < mJSONArray.length(); i++) {
        jsonObj = mJSONArray.optJSONObject(i);
        list.add(jsonObj);
    }
    //排序操作
    JsonComparator pComparator =  new JsonComparator(dateName);
    Collections.sort(list, pComparator);

    //把数据放回去 
　　 mJSONArray = new JSONArray();
    for (int i = 0; i < list.size(); i++) {
        jsonObj = list.get(i);
        mJSONArray.put(jsonObj);
    }
}
public class JsonComparator implements Comparator<JSONObject>{

  String dateName = "";
  JsonComparator(String dateName){
    this.dateName = dateName;
  }
  @Override
  public int compare(JSONObject json1, JSONObject json2){
    String date1 = json1.optString(dateName);
    String date2 = json2.optString(dateName);
    if(date1.compareTo(date2) < 0){
      return 1;
    }else if(date1.compareTo(date2) >0){
      return -1;
    }
    return 0;
  }
}

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