JSON Key大写转小写（同理，小写转大写也可以）

package com.zhdw.webservice.util;

import java.util.Iterator;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;  

/*
 * json格式key转小写
 * 
 * */

public class JsonToLower {  
    public static void main(String[] args) {
        String json = "{'JOIN_PARTY_TIME':2010,'MEMBER_NAME':'刘小燕','ORG_ID':'c9e1d4e9479fa17bb51a5cda3702','ORG_NAME':'委网联党支部','SEX':'0','BIRTH_DATE':'1989-05-20','MEMBER_ID':'887a3dc84502b0420b1a9eaccb97','PARTY_CODE':'3607026315010101'}";
        String jsonArray =  "[{'num':'成绩', '外语':88, '历史':65, '地理':99, 'object':{'AAAA':'ASCDW','BBBB':'2222','cccc':'3333'}}," +
                   "{'num':'兴趣', '外语':28, '历史':45, '地理':19, 'object':{'aaa':'11a11','bbb':'2222','cccc':'3333'}}," +
                   "{'num':'爱好', '外语':48, '历史':62, '地理':39, 'object':{'aaa':'11c11','bbb':'2222','cccc':'3333'}}]";

              //重新解析jsonObject中的key，转换为小写的key
                System.out.println(transToLowerObject(json));
                System.out.println(transToArray(jsonArray).toString());
                }

         /**
             * json大写转小写
             * 
             * @param jSONArray1 jSONArray1
             * @return JSONObject
             */
            public static JSONObject transToLowerObject(String json) {
                JSONObject jSONArray2 = new JSONObject();
                JSONObject jSONArray1 = JSONObject.fromObject(json);
                Iterator it = jSONArray1.keys();
                while (it.hasNext()) {
                    String key = (String) it.next();
                    Object object = jSONArray1.get(key);
                    if (object.getClass().toString().endsWith("JSONObject")) {
                        jSONArray2.accumulate(key.toLowerCase(), transToLowerObject(object.toString()));
                    } else if (object.getClass().toString().endsWith("JSONArray")) {
                        jSONArray2.accumulate(key.toLowerCase(), transToArray(jSONArray1.getJSONArray(key).toString()));
                    }else{
                         jSONArray2.accumulate(key.toLowerCase(), object);
                    }
                }
                return jSONArray2;
            }

            /**
             * jsonArray转jsonArray
             * 
             * @param jSONArray1 jSONArray1
             * @return JSONArray
             */
            public static JSONArray transToArray(String jsonArray) {
                JSONArray jSONArray2 = new JSONArray();
                JSONArray jSONArray1 = JSONArray.fromObject(jsonArray);
                for (int i = 0; i < jSONArray1.size(); i++) {
                    Object jArray = jSONArray1.getJSONObject(i);
                    if (jArray.getClass().toString().endsWith("JSONObject")) {
                        jSONArray2.add(transToLowerObject( jArray.toString()));
                    } else if (jArray.getClass().toString().endsWith("JSONArray")) {
                        jSONArray2.add(transToArray(jArray.toString()));
                    }
                }
                return jSONArray2;
            }
}  

运行输出结果：

{"join_party_time":2010,"member_name":"刘小燕","org_id":"c9e1d4e9479fa17bb51a5cda3702","org_name":"委网联党支部","sex":"0","birth_date":"1989-05-20","member_id":"887a3dc84502b0420b1a9eaccb97","party_code":"3607026315010101"}
[{"num":"成绩","外语":88,"历史":65,"地理":99,"object":{"aaaa":"ASCDW","bbbb":"2222","cccc":"3333"}},{"num":"兴趣","外语":28,"历史":45,"地理":19,"object":{"aaa":"11a11","bbb":"2222","cccc":"3333"}},{"num":"爱好","外语":48,"历史":62,"地理":39,"object":{"aaa":"11c11","bbb":"2222","cccc":"3333"}}]

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