fastjson根据json数组中对象的某个字段进行排序

记录一下

/**
    *@Author:vic
    *@Date:14:59 2018/11/30
    *@Description: is_desc-false升序列  is_desc-true降序
    */
public static String jsonArraySort(JSONArray jsonArr,String sortKey,boolean is_desc) {
        JSONArray sortedJsonArray = new JSONArray();
        List<JSONObject> jsonValues = new ArrayList<JSONObject>();
        for (int i = 0; i < jsonArr.size(); i++) {
            jsonValues.add(jsonArr.getJSONObject(i));
        }
        Collections.sort(jsonValues, new Comparator<JSONObject>() {
            private  final String KEY_NAME = sortKey;

            @Override
            public int compare(JSONObject a, JSONObject b) {
                String valA = new String();
                String valB = new String();
                try {
                    valA = a.getString(KEY_NAME);
                    valB = b.getString(KEY_NAME);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                if (is_desc){
                    return -valA.compareTo(valB);
                } else {
                    return -valB.compareTo(valA);
                }

            }
        });
        for (int i = 0; i < jsonArr.size(); i++) {
            sortedJsonArray.add(jsonValues.get(i));
        }
        return sortedJsonArray.toString();
    }