public static JSONObject parseObj(String jsonStr) {
		return new JSONObject(jsonStr);
	}
@Test
	public void toJsonStrTest2() {
		final Map<String, Object> model = new HashMap<>();
		model.put("mobile", "17610836523");
		model.put("type", 1);

		final Map<String, Object> data = new HashMap<>();
		data.put("model", model);
		data.put("model2", model);

		final JSONObject jsonObject = JSONUtil.parseObj(data);

		assertTrue(jsonObject.containsKey("model"));
		assertEquals(1, jsonObject.getJSONObject("model").getInt("type").intValue());
		assertEquals("17610836523", jsonObject.getJSONObject("model").getStr("mobile"));
		// assertEquals("{\"model\":{\"type\":1,\"mobile\":\"17610836523\"}}", jsonObject.toString());
	}