/**

 *

 */

package map2json;

import java.util.HashMap;

import java.util.Iterator;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.Map.Entry;

import net.sf.json.JSONArray;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONObject;

import com.google.gson.Gson;

/**

 * @author hy

 * @date 2019-02-25 15:45:35

 *

 */

public class map2json {

	public static void main(String[] args) {

		map2jsonstr1();

		map2jsonstr2();

		map2jsonstr3();

		map2jsonstr4();

	}

	// net.sf.json包

	public static void map2jsonstr1() {

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

		map.put("1", "a");

		map.put("2", "b");

		map.put("3", "c");

		map.put("4", "d");

		map.put("5", "e");

		map.put("6", new String[] { "aa", "bb" });

		// 多个不同包的同名类，需要指明指哪个包里的

		net.sf.json.JSONObject jo = net.sf.json.JSONObject.fromObject(map);

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

		// 数组

		JSONArray json = JSONArray.fromObject(map);

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

		// 将json数据再转回map

		net.sf.json.JSONObject myJson = net.sf.json.JSONObject.fromObject(map);

		@SuppressWarnings("unchecked")

		Map<Object, Object> m = myJson;

		for (Entry<Object, Object> entry : m.entrySet()) {

			System.out.println(entry.getKey().toString() + ":"

					+ entry.getValue().toString());

		}

	}

	// org.json包

	public static void map2jsonstr2() {

		Map<String, String> map = new LinkedHashMap<String, String>();

		map.put("1", "a");

		map.put("2", "b");

		map.put("3", "c");

		map.put("4", "d");

		map.put("5", "e");

		// org.json

		org.json.JSONObject js = new org.json.JSONObject(map);

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

		Map<Object, Object> ma = new HashMap<>();

		@SuppressWarnings("rawtypes")

		Iterator it = js.keys();

		while (it.hasNext()) {

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

			// 得到value的值

			Object value = js.get(key);

			// System.out.println(key+":"+valStr);

			ma.put(key, value.toString());

		}

		for (Entry<Object, Object> mp : ma.entrySet()) {

			System.out.println(mp.getKey() + ":" + mp.getValue());

		}

	}

	// com.google.gson包

	public static void map2jsonstr3() {

		Map<String, String> map = new LinkedHashMap<String, String>();

		map.put("1", "a");

		map.put("2", "b");

		map.put("3", "c");

		map.put("4", "d");

		map.put("5", "e");

		Gson gson = new Gson();

		String jsonStr = gson.toJson(map);

		System.out.println(jsonStr);

		Map<Object, Object> ma = new HashMap<>();

		ma = gson.fromJson(jsonStr, Map.class);

		for (Entry<Object, Object> mp : ma.entrySet()) {

			System.out.println(mp.getKey() + ":" + mp.getValue());

		}

	}

	// com.alibaba.fastjson包

	public static void map2jsonstr4() {

		Map<String, String> map = new LinkedHashMap<String, String>();

		map.put("1", "a");

		map.put("2", "b");

		map.put("3", "c");

		map.put("4", "d");

		map.put("5", "e");

		// map转json

		com.alibaba.fastjson.JSONObject jsonObject = (JSONObject) com.alibaba.fastjson.JSONObject

				.toJSON(map);

		String alijson = jsonObject.toJSONString();

		System.out.println(alijson);

		// json转map

		/*

		 * Map<String, String> maps = (Map<String, String>) JSON.parse(alijson);

		 * for (Entry<String, String> alima :maps.entrySet()) {

		 * System.out.println(alima.getKey()+":"+alima.getValue()); }

		 */

		Map alimap = JSON.parseObject(alijson, Map.class);

		for (Object obj : alimap.keySet()) {

			System.out.println(obj + "：" + alimap.get(obj));

		}

	}

}