Json转换

package cn.jstorm.json;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import org.apache.commons.lang.StringUtils;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class Json {

public static List<Object> toList(String jsonStr) {

if (StringUtils.isBlank(jsonStr)) {

return new ArrayList<Object>();

}

JSONArray jsonArray = JSONArray.fromObject(jsonStr);

List<Object> list = (List<Object>) JSONArray.toList(jsonArray);

return list;

}

public static Map<String, Object> toMap(String jsonStr) {

Map<String, Object> data = new HashMap<String, Object>();

// 将json字符串转换成jsonObject

JSONObject jsonObject = JSONObject.fromObject(jsonStr);

Iterator<Object> it = jsonObject.keys();

// 遍历jsonObject数据，添加到Map对象

while (it.hasNext()) {

String key = String.valueOf(it.next());

Object value = jsonObject.get(key);

data.put(key, value);

}

return data;

}

public static String lsToJson(List<Object> ls) {

JSONArray json = JSONArray.fromObject(ls);

return json.toString();

}

public static String mapToJson(Map<String, Object> map) {

JSONObject json = JSONObject.fromObject(map);

return json.toString();

}

public static void main(String[] args) {

List<Object> ls = new ArrayList<Object>();

User user = new User();

user.setName("jack lin");

user.setBirthday(new Date());

user.setAge(18);

ls.add("my pic");

ls.add(119);

ls.add(new Date());

ls.add(user);

Map<String ,Object> map = new HashMap<String, Object>();

map.put("list", ls);

map.put("str", "string");

map.put("int", 10000);

map.put("Date", new Date());

String map_str = Json.mapToJson(map);

Map<String,Object> rm = Json.toMap(map_str);

List<Object> l = (List<Object>) rm.get("list");

for (Object object : l) {

System.out.println(object);

}

System.out.println(new Date());

String ls_str = Json.lsToJson(ls);

System.out.println(ls_str);

List<Object> rl = Json.toList(ls_str);

System.out.println(rl.toString());

}

}