如何将JSON、Map、List三者间灵活转换？

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java/** * 工作中常用的JSON转换工具集 * * Created with IntelliJ IDEA. * User: yuyue * Date: 14-7-23 * Time: 下午7:51 * /public class JsonHelper { * * map转json，list转map，map转json的工具集合 * * @param object 是一个 对象 */

工作中自己写或者收集的jason转map，list 或者list，map转json的工具集合

/** * Created with IntelliJ IDEA. * User: yuyue * Date: 14-7-23 * Time: 下午7:51 */ public class JsonHelper { /** * map转json * * @param object 是一个map * @return * @throws JSONException */ public static Object mapToJSON(Object object) throws JSONException { if (object instanceof Map) { JSONObject json = new JSONObject(); Map map = (Map) object; for (Object key : map.keySet()) { json.put(key.toString(), mapToJSON(map.get(key))); } return json; } else if (object instanceof Iterable) { JSONArray json = new JSONArray(); for (Object value : ((Iterable) object)) { json.put(value); } return json; } else { return object; } } /** * list转json * @param object * @return */ public static JSONArray listToJson(Iterable object){ JSONArray json = new JSONArray(); for (Object value : object) { json.put(value); } return json; } public static boolean isEmptyObject(JSONObject object) { return object.names() == null; } public static Map getMap(JSONObject object, String key) throws JSONException { return toMap(object.getJSONObject(key)); } /** * json转map * * @param object * @return * @throws JSONException */ public static HashMap toMap(JSONObject object) throws JSONException { HashMap map = new HashMap(); Iterator keys = object.keys(); while (keys.hasNext()) { String key = (String) keys.next(); map.put(key, fromJson(object.get(key))); } return map; } /** * json转list * * @param array * @return * @throws JSONException */ public static List toList(JSONArray array) throws JSONException { List list = new ArrayList(); for (int i = 0; i < array.length(); i++) { list.add(fromJson(array.get(i))); } return list; } /** * 根据情况将json转换为list 或者map * * @param json * @return * @throws JSONException */ private static Object fromJson(Object json) throws JSONException { if (json == JSONObject.NULL) { return null; } else if (json instanceof JSONObject) { return toMap((JSONObject) json); } else if (json instanceof JSONArray) { return toList((JSONArray) json); } else { return json; } } /** * 将String转换成json * * @param s * @return */ public static JSONObject stringToJson(String s) { JSONObject jsonObject = null; try { jsonObject = new JSONObject(s); } catch (JSONException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } return jsonObject; } /** * 将String转换成json * * @param s * @return */ public static JSONArray stringToJsonArray(String s) { JSONArray jsonObject = null; try { jsonObject = new JSONArray(s); } catch (JSONException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } return jsonObject; } }