3-JAVA中的JSON操作

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();
        }
    }
}