source: class JsonUtilTest {
  
  	@Test
  	public void test1(){
  
target: 		ObjectNode root = JsonUtil.createObjectNode();
  		ObjectNode node1 = JsonUtil.createObjectNode();
  		ObjectNode node2 = JsonUtil.createObjectNode();
  		node2.put("zhang", 1);
  		node1.put("aaaa", "1111");
  		node1.set("bbb", node2);
  		root.set("child",node1);
  		System.out.println(root.toString());
  	}
  
  }