利用:com.fasterxml.jackson
原文地址:https://blog.csdn.net/joyous/article/details/9448461
说明:Map转化为Json;创建Json,添加节点或Array
原文地址:https://www.cnblogs.com/winner-0715/p/6109225.html
说明:Java对象转化为Json
原文地址:http://neverflyaway.iteye.com/blog/2299805
说明:读写Json文件,遍历JsonNode数组
原文地址:https://blog.csdn.net/u014452858/article/details/45650817
说明:jsonGenerator
原文地址:https://blog.csdn.net/jay_1989/article/details/51262059
说明:两种生成Json的方法。方法一:一个个结点创建。方法二:拼接字符串创建。
【方法一】生成Json
package com.pcmall; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ArrayNode; import com.fasterxml.jackson.databind.node.ObjectNode; public class CreateJson { /** * 创建一个 json,并向该 json 添加内容 */ public static void MyTest04() { try { ObjectMapper mapper = new ObjectMapper(); ObjectNode root1 = mapper.createObjectNode(); root1.put("nodekey1", 1); root1.put("nodekey2", 2); System.out.println(root1.toString()); //Create the root node ObjectNode root = mapper.createObjectNode (); //Create a child node ObjectNode node1 = mapper.createObjectNode (); node1.put ("nodekey1", 1); node1.put ("nodekey2", 2); //Bind the child nodes root.put ("child", node1); //Array of nodes ArrayNode arrayNode = mapper.createArrayNode (); arrayNode.add (node1); arrayNode.add (1); //Bind array node root.put ("arraynode", arrayNode); System.out.println (mapper.writeValueAsString (root)); // 得到的输出信息 // {"child":{"nodekey1":1,"nodekey2":2},"arraynode":[{"nodekey1":1,"nodekey2":2},1]} } catch (Exception e) { } } public static void main(String[] args){ MyTest04(); } }
输出结果:
{
"child": {
"nodekey1": 1,
"nodekey2": 2
},
"arraynode": [{
"nodekey1": 1,
"nodekey2": 2
},
1]
}
【方法二】生成Json
String str = "{"data":{"hasnext":0,"info":[{"id":"288206077664983","timestamp":1371052476},{"id":"186983078111768","timestamp":1370944068},{"id":"297031120529307","timestamp":1370751789},{"id":"273831022294863","timestamp":1369994812}],"timestamp":1374562897,"totalnum":422},"errcode":0,"msg":"ok","ret":0,"seqid":5903702688915195270}"; ObjectMapper mapper = new ObjectMapper(); try { JsonNode root = mapper.readTree(str); System.out.println("root" + root.toString()); } catch (IOException e) { e.printStackTrace(); }
输出结果:
root {
"data": {
"hasnext": 0,
"info": [{
"id": "288206077664983",
"timestamp": 1371052476
},
{
"id": "186983078111768",
"timestamp": 1370944068
},
{
"id": "297031120529307",
"timestamp": 1370751789
},
{
"id": "273831022294863",
"timestamp": 1369994812
}],
"timestamp": 1374562897,
"totalnum": 422
},
"errcode": 0,
"msg": "ok",
"ret": 0,
"seqid": 5903702688915195270
}