Json字符串与Bean，Json字符串与List 互转工具类。
public class GsonUtil {private static Gson gson = new Gson();private GsonUtil() {}/*** 转成json*/public static String beanToString(Object object) {String gsonString = null;if (gson != null) {gsonString = gson.toJson(object);}return gsonString;}/*** 转成bean*/public static <T> T stringToBean(String gsonString, Class<T> cls) {T t = null;if (gson != null) {t = gson.fromJson(gsonString, cls);}return t;}/*** 转成list*/public static <T> ArrayList<T> stringToList(String gsonString, Class<T> cls) {ArrayList<T> list = new ArrayList<>();if (gson != null) {JsonArray array = new JsonParser().parse(gsonString).getAsJsonArray();for (final JsonElement elem : array) {list.add(gson.fromJson(elem, cls));}}return list;}/*** 转成list, 有可能造成类型擦除*/public static <T> ArrayList<T> stringToList(String gsonString) {ArrayList<T> list = null;if (gson != null) {list = gson.fromJson(gsonString, new TypeToken<ArrayList<T>>() {}.getType());}return list;}/*** 转成map的*/public static <T> Map<String, T> stringToMaps(String gsonString, Class<T> cls) {Map<String, T> map = null;if (gson != null) {map = gson.fromJson(gsonString, new TypeToken<Map<String, T>>() {}.getType());}return map;}
}