import net.sf.json.JSON;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.xml.XMLSerializer;

/**
 * Json串处理工具类
 * json,list,map等之间的各种转化
 * @author
 * @version 2.0 create at,2009-2-12
 * 
 */
public class JsonUtil {
	/**
	 * 将json格式的字符串转化为jsonobject
	 * @param str
	 * @return
	 * @throws ApplicationException 
	 */
	public static JSONObject stringToJsonObject(String str) throws ApplicationException {
		JSONObject jsonObject = null;
		if (Validator.isNotNull(str)) {
			try{
				jsonObject = JSONObject.fromObject(str);
			}catch(Exception ex){
				throw new ApplicationException("要转化的字符串格式不对，必须为json格式！");
			}
		}
		return jsonObject;
	}

	/**
	 * 从指定的List<map>对象中获取要设置的值后组装成返回给前台的JSON对象字符串.
	 * 主要用于给前台分页grid组装数据
	 * @param list    list<map>从数据库中查询出来的数据
	 * @param count   总数
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public static String fromMap(List list, int count) {
		//将list<map>转化为jsonarray
		JSONArray options = formListArray(list);
		JSONObject result = new JSONObject();
		result.put("result", options);
		result.put("totalCount", count);
		return result.toString();
	}

	/**
	 * 将Map<String,String>转化为JSONObject格式的字符串
	 * @param map
	 * @return {"success":true,"result":{}}
	 */
	public static String fromMapToJson(Map<String, String> map) {
		Iterator<String> it = map.keySet().iterator();
		JSONObject jsonObject = new JSONObject();
		JSONObject json = new JSONObject();
		while (it.hasNext()) {
			String key = (String) it.next();
			jsonObject.put(key.toLowerCase(), map.get(key));
		}
		json.put("success", true);
		json.put("result", jsonObject.toString());
		return json.toString();
	}

	/**
	 * 	将list<map>转化为jsonobject格式的字符串
	 * @param list
	 * @return {"result":{...}}
	 */
	@SuppressWarnings("unchecked")
	public static String fromListMap(List list) {
		JSONArray options = new JSONArray();
		for (Object obj : list) {
			Iterator it = ((Map) obj).keySet().iterator();
			Object value;
			JSONObject option = new JSONObject();
			while (it.hasNext()) {
				String key = (String) it.next();
				value = ((Map) obj).get(key);
				value = value != null ? value : "";
				option.put(key.toLowerCase(), value);
			}
			options.add(option);
		}
		JSONObject result = new JSONObject();
		result.put("result", options.toString());
		return result.toString();
	}

	/**
	 * 从list<map>转化为treenode的json
	 * @param list
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public static String toAsynTreeJson(List list) {
		JSONArray ja = new JSONArray();
		for (Object obj : list) {
			Iterator it = ((Map) obj).keySet().iterator();
			JSONObject option = new JSONObject();
			while (it.hasNext()) {
				String key = (String) it.next();
				Object value = ((Map) obj).get(key);
				key = key.toLowerCase();
				value = value == null ? "" : value.toString();
				//是否含有带checkbox的treenode
				if (key.equals("checked")) {
					boolean check = value.equals("1") ? true : false;
					option.put("checked", check);
				}
				//是为叶子节点还是为非叶子节点
				else if("leaf".equals(key)){
					boolean leaf = value.toString().trim().equals("1")?true:false;
					option.put("leaf", leaf);
				}else if("draggable".equals(key)){
					boolean draggable = value.toString().trim().equals("1")?true:false;
					option.put("draggable", draggable);
				}
				else
					option.put(key, value);
			}
			ja.add(option);
		}
		return ja.toString();
	}

	/**
	 * 将list<map>转化为jsonarray
	 * 此JSONArray的格式将会是这样[{},{}]
	 * @param list 
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public static JSONArray formListArray(List list) {
		JSONArray options = new JSONArray();
		for (Object obj : list) {
			Iterator it = ((Map) obj).keySet().iterator();
			JSONObject option = new JSONObject();
			while (it.hasNext()) {
				String key = (String) it.next();
				Object value = ((Map) obj).get(