jackson-嵌套json转换为java对象

    话不多说，上代码：

Json > java bean:

String data = "{\"SN\":\"863703030059864\",\"CMD\":\"UBD\",\"FLOW\":\"89\",\"TIME\":\"0\",\"STATUS\":\"1\",\"DATAS\":{\"data0\":\"863703030059864\",\"data1\":\"460068162083055\",\"data2\":\"69 \",\"data3\":\"27\",\"data4\":\"356\",\"data5\":\"0\",\"data6\":\"0\",\"data7\":\"0\",\"data9\":\"1\",\"data10\":\"1\",\"data11\":\"246.54,175.40\",\"data12\":\"-887,31,-385\",\"data13\":\"0,0,24,15,15\"}}"

    

JsonNode rootNode = null,childrenNode = null;
		try {
		    rootNode = objectMapper.readTree(data);
		   
		    childrenNode = rootNode.path("DATAS"); 
		    
		} catch (JsonParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (JsonMappingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 

    这样，就不用写java对象，来存json了，直接可以用：

rootNode.get("CMD").asText()
childrenNode.get("data0").asText()

    直接拿到你需要的字段了，还是很方便和高效的；

java bean > Json :

String result = {"CMD": "ACT","SN": "863703030059864", "DATAS": {"status": "1","travel_switch": "1","hinge": "0","beacon_interval":"24","level_interval": "15","travel_interval": "15"}} }

    这里需要两个java对象来set数据，

				Data data = new Data();
				Datas datas = new Datas();
				String result = {"CMD": "ACT","SN": "863703030059864", "DATAS": {"status": "1","travel_switch": "1","hinge": "0","beacon_interval":"24","level_interval": "15","travel_interval": "15"}} }

				datas.setStatus("1");
				datas.setTravel_switch("1");
				datas.setHinge("0");
				datas.setBeacon_interval("24");
				datas.setLevel_interval("15");
				datas.setTravel_interval("15");
				
				data.setCMD("ACT");
				data.setSN("863703030059864");
				data.setDATAS(datas);
				
				String result  = null;
				try {
					result  = objectMapper.writeValueAsString(data);
				} catch (JsonProcessingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} 

    Jackson跟我们之前用的（import com.google.gson.Gson; 和 import net.sf.json.JSONObject;）不太一样，但是新的体验不是很美妙吗，嘿嘿~