1.JSON

1. Create a JSONObject object:

package com.yunos.tv.video.resource.controller.web;

import java.util.ArrayList;
import java.util.HashMap;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class Test {

public static void main(String[] args) {
    / / The difference between JsonObject and JsonArray is that JsonObject is an object form, JsonArray is an array form
         / / Create the first method of JsonObject
    JSONObject jsonObject = new JSONObject();
    jsonObject.put("UserName", "ZHULI");
    jsonObject.put("age", "30");
    jsonObject.put("workIn", "ALI");
    System.out.println("jsonObject1：" + jsonObject);
    
         / / Create a second method of JsonObject
    HashMap<String, String> hashMap = new HashMap<String, String>();
    hashMap.put("UserName", "ZHULI");
    hashMap.put("age", "30");
    hashMap.put("workIn", "ALI");
    System.out.println("jsonObject2：" + JSONObject.fromObject(hashMap));
    
         / / Create a JsonArray method 1
    JSONArray jsonArray = new JSONArray();
    jsonArray.add(0, "ZHULI");
    jsonArray.add(1, "30");
    jsonArray.add(2, "ALI");
    System.out.println("jsonArray1：" + jsonArray);
    
         / / Create JsonArray method 2
    ArrayList<String> arrayList = new ArrayList<String>();
    arrayList.add("ZHULI");
    arrayList.add("30");
    arrayList.add("ALI");
    System.out.println("jsonArray2：" + JSONArray.fromObject(arrayList));
    
         / / If the JSONArray parses a HashMap, it will put the entire object into the value of an array
    System.out.println("jsonArray FROM HASHMAP：" + JSONArray.fromObject(hashMap));
    
         / / Assemble a complex JSONArray
    JSONObject jsonObject2 = new JSONObject();
    jsonObject2.put("UserName", "ZHULI");
    jsonObject2.put("age", "30");
    jsonObject2.put("workIn", "ALI");
    jsonObject2.element("Array", arrayList);
    System.out.println("jsonObject2：" + jsonObject2);
            
}

}

result:

jsonObject1：{“UserName”:“ZHULI”,“age”:“30”,“workIn”:“ALI”}
jsonObject2：{“workIn”:“ALI”,“age”:“30”,“UserName”:“ZHULI”}
jsonArray1：[“ZHULI”,“30”,“ALI”]
jsonArray2：[“ZHULI”,“30”,“ALI”]
jsonArray FROM HASHMAP：[{“workIn”:“ALI”,“age”:“30”,“UserName”:“ZHULI”}]
jsonObject2：{“UserName”:“ZHULI”,“age”:“30”,“workIn”:“ALI”,“Array”:[“ZHULI”,“30”,“ALI”]}

Parse the JSON string:

package com.yunos.tv.video.resource.controller.web;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class Test {

public static void main(String[] args) {
    String jsonString = "{\"UserName\":\"ZHULI\",\"age\":\"30\",\"workIn\":\"ALI\",\"Array\":[\"ZHULI\",\"30\",\"ALI\"]}";
         / / Convert the Json string to a java object
    JSONObject obj = JSONObject.fromObject(jsonString);
         / / Get the UserName in the Object
    if (obj.has("UserName")) {
        System.out.println("UserName:" + obj.getString("UserName"));
    }
         / / Get ArrayObject
    if (obj.has("Array")) {
        JSONArray transitListArray = obj.getJSONArray("Array");
        for (int i = 0; i < transitListArray.size(); i++) {
            System.out.print("Array:" + transitListArray.getString(i) + " ");
        }
    }
}

}

return:

UserName:ZHULI
Array:ZHULI Array:30 Array:ALI
A brief introduction to optString:
.getString(String name), like optString(String name), returns a field in object. Just when there is no return value, getString(String name) throws an error, optString(String name) returns a null value.
A brief introduction to jsonArray.opt:
returns a corresponding JSONObject object when traversing a jsonArray object