jackson readTree

String jsonstr = "{\"msg\":{\"head\":{\"version\":\"1.0\",\"bizcode\":\"1006\",\"senddate\":\"20140827\",\"sendtime\":\"110325\",\"seqid\":\"1\"},\"body\":{\"datalist\":\"wahaha\",\"rstcode\":\"000000\",\"rstmsg\":\"成功\"}}}";
        ObjectMapper mapper = new ObjectMapper();  

        //允许出现特殊字符和转义符
        mapper.configure(Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true) ;
        JsonNode root = mapper.readTree(jsonstr);
        
　　　　 //path与get作用相同,但是当找不到该节点的时候,返回missing node而不是Null. 
        JsonNode msg = root.path("msg");
        JsonNode head = msg.path("head");
        JsonNode body = msg.path("body");  

        String bizcode = head.path("bizcode").asText();
        String datalist = body.path("datalist").asText();  

        System.err.println(bizcode);
        System.err.println(datalist);

        System.err.println(root.path("msg").path("body").path("datalist").asText());

　　

try {
			ObjectMapper mapper = new ObjectMapper();

			// 允许出现特殊字符和转义符
			mapper.configure(Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);

			// String jsonstr =
			// "{\"msg\":{\"head\":{\"version\":\"1.0\",\"bizcode\":\"1006\",\"senddate\":\"20140827\",\"sendtime\":\"110325\",\"seqid\":\"1\"},\"body\":{\"datalist\":\"wahaha\",\"rstcode\":\"000000\",\"rstmsg\":\"成功\"}}}";

			ObjectNode root = mapper.createObjectNode();
			ObjectNode msg = mapper.createObjectNode();

			ObjectNode head = mapper.createObjectNode();
			head.put("version", "1.0");
			head.put("bizcode", "1006");
			head.put("senddate", "20140827");
			head.put("sendtime", "110325");
			head.put("seqid", "1");

			ObjectNode body = mapper.createObjectNode();
			body.put("datalist", "wahaha");
			body.put("rstcode", "000000");
			body.put("rstmsg", "成功");

			msg.put("head", head);
			msg.put("body", body);
			root.put("msg", msg);

			System.out.println(mapper.writeValueAsString(root));

		} catch (Exception e) {
			e.printStackTrace();
		}