如果需要对json数组按JSON的某个字段大小排序，例如下面段json，想要按json数组sites中的name字段排序

"sites": [
        { "name":"Google", "info":[ "Android", "Google 搜索", "Google 翻译" ] },
        { "name":"Runoob", "info":[ "菜鸟教程", "菜鸟工具", "菜鸟微信" ] },
        { "name":"Taobao", "info":[ "淘宝", "网购" ] }
    ]

    /**
     * 对json数组排序，
     * @param jsonArr
     * @param sortKey 排序关键字
     * @param is_desc is_desc-false升序列  is_desc-true降序 (排序字段为字符串)
     * @return
     */
    public static String jsonArraySort(JSONArray jsonArr,String sortKey,boolean is_desc) {
        //存放排序结果json数组
        JSONArray sortedJsonArray = new JSONArray();
        //用于排序的list
        List<JSONObject> jsonValues = new ArrayList<JSONObject>();
        //将参数json数组每一项取出，放入list
        for (int i = 0; i < jsonArr.size(); i++) {
            jsonValues.add(JSONObject.fromObject(jsonArr.getJSONObject(i)));
        }
        //快速排序，重写compare方法，完成按指定字段比较，完成排序
        Collections.sort(jsonValues, new Comparator<JSONObject>() {
            //排序字段
            private  final String KEY_NAME = sortKey;
            //重写compare方法
            @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();
                }
                //是升序还是降序
                if (is_desc){
                    return -valA.compareTo(valB);
                } else {
                    return -valB.compareTo(valA);
                }

            }
        });
        //将排序后结果放入结果jsonArray
        for (int i = 0; i < jsonArr.size(); i++) {
            sortedJsonArray.add(jsonValues.get(i));
        }
        return sortedJsonArray.toString();
    }

注意：代码中的JSONObject.fromObject()方法需要

import net.sf.json.JSONObject;

并在pow配置文件中加入以下依赖

<!-- JSONObject对象依赖的jar包 -->
        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
            <version>1.9.3</version>
        </dependency>
         <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>3.2.1</version>
        </dependency>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>net.sf.ezmorph</groupId>
            <artifactId>ezmorph</artifactId>
            <version>1.0.6</version>
        </dependency>
         <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.2.3</version>
            <classifier>jdk15</classifier><!-- 指定jdk版本 -->
        </dependency>

然后引入对应的JSONArray

import net.sf.json.JSONArray;

如果想对非String类型的字段进行排序，只需要修改 public int compare(JSONObject a, JSONObject b)中的变量类型，例如：

            //重写compare方法
            @Override
            public int compare(JSONObject a, JSONObject b) {
                Double valA = new Double(0);
                Double valB = new Double(0);
                try {
                    valA = a.getDouble(KEY_NAME);
                    valB = b.getDouble(KEY_NAME);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                //是升序还是降序
                if (is_desc){
                    return -valA.compareTo(valB);
                } else {
                    return -valB.compareTo(valA);
                }

            }

参考：

jsonArray中按某字段排序