1.JAVA语法

2.JSON创建

package com.example;import com.google.gson.JsonArray;import com.google.gson.JsonObject;public class MyClass {    public static void main(String []args){        JsonObject object = new JsonObject();        object.addProperty("cat","it");        JsonArray array = new JsonArray();        JsonObject lan1 = new JsonObject();        lan1.addProperty("id",1);        lan1.addProperty("name","java");        lan1.addProperty("ide","eclipse");        array.add(lan1);        JsonObject lan2 = new JsonObject();        lan2.addProperty("id",2);        lan2.addProperty("name","swift");        lan2.addProperty("ide","xcode");        array.add(lan2);        object.add("lanuage",array);        object.addProperty("pop",true);        System.out.println(object.toString());    }}

3.JSON读取

package com.example;import com.google.gson.JsonArray;import com.google.gson.JsonObject;import com.google.gson.JsonParser;import java.io.FileNotFoundException;import java.io.FileReader;public class MyClass {    public static void main(String []args){        try {            JsonParser jp = new JsonParser();            JsonObject jo = (JsonObject) jp.parse(new FileReader("test.json"));            System.out.println("cat="+jo.get("cat").getAsString());            System.out.println("pop="+jo.get("pop").getAsBoolean());            JsonArray ja = jo.get("languages").getAsJsonArray();            for (int i = 0; i < ja.size(); i ++){                JsonObject subJo = ja.get(i).getAsJsonObject();                System.out.println("id="+subJo.get("id").getAsInt());                System.out.println("ide="+subJo.get("ide").getAsString());                System.out.println("name="+subJo.get("name").getAsString());            }        } catch (FileNotFoundException e) {            e.printStackTrace();        }    }}