/*
 *    Copyright 2012-2013 The Haohui Network Corporation
 */
package com.haohui.httpclient;

import com.alibaba.fastjson.JSONObject;

/**
 * 
 * @project HelloWorld
 * @author cevencheng <cevencheng@gmail.com>
 * @create 2013-4-24 下午11:22:22
 */
public class JSONUtils {

	/**
	 * <pre>
	 * 调用示例：
	 * 		String json = "{\"status\": {\"code\": 1001,\"msg\": \"正常\"},\"result\": {\"data\": {\"is_end\": false,\"userId\": \"helo_kitty\"}}}";
	 * 		JSONObject jsonObject = JSONObject.parseObject(json);
	 * 		Object lastTweetId = JSONUtils.select(jsonObject, "result.data.userId");
	 * 		System.out.println(lastTweetId);
	 * ---- print：
	 * helo_kitty
	 * </pre>
	 * 
	 * @return
	 */
	public static Object select(JSONObject jsonObj, String keyPath) {
		if (null == jsonObj || null == keyPath) {
			return null;
		}
		String[] patharr = keyPath.split("\\.");
		JSONObject current = jsonObj;
		Object retvalue = null;
		for (int i = 0; i < patharr.length; i++) {
			String key = patharr[i];
			retvalue = current.get(key);
			if (i < (patharr.length - 1)) {
				current = (JSONObject) retvalue;
			}
		}
		return retvalue;
	}
	
	public static void main(String[] args) {
		
		String json = "{\"status\": {\"code\": 1001,\"msg\": \"正常\"},\"result\": {\"data\": {\"is_end\": false,\"userId\": \"helo_kitty\"}}}";
		 JSONObject jsonObject = JSONObject.parseObject(json);
		 Object lastTweetId = JSONUtils.select(jsonObject, "result.data.userId");
		 System.out.println(lastTweetId);
		 
	}
}