String str = "{\"route\":\"onGift\",\"time\":\"\",\"userId\":\"\",\"userName\":\"\",\"level\":\"1_2_2_2_0\",\"adminType\":0,\"tuserId\":\"\"," +
        "\"tuserName\":\"\",\"tlevel\":\"10_2_2_2_0\",\"roomId\":\"\",\"giftId\":\"001\",\"fcId\":\"0\",\"amount\":\"1\",\"price\":\"0\",\"bean\":\"6546316\"}";

JSONObject json = null;

try {
    json = new JSONObject(str);
} catch (JSONException e) {
    e.printStackTrace();
}

java拼接JSON串