使用Java读取、创建JSON数据

1.使用Java读取JSON数据

package peixun;

import java.io.FileNotFoundException;
import java.io.FileReader;

import com.google.gson.JsonArray;
import com.google.gson.JsonIOException;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;

public class TestReadJSON {

    public static void main(String[] args) {
        
        try {
            //JSON解析器
            JsonParser parser = new JsonParser();
            //解析器可以解析字符串和输入流了
            JsonObject object = (JsonObject) parser.parse(new FileReader("test.json"));
            
            System.out.println("cat="+object.get("cat").getAsString());
            System.out.println("pop="+object.get("pop").getAsBoolean());
            
            JsonArray array = object.get("languages").getAsJsonArray();
            for (int i = 0; i < array.size(); i++) {
                System.out.println("----------");
                JsonObject subObject = array.get(i).getAsJsonObject();
                System.out.println("id=" + subObject.get("id").getAsInt());
                System.out.println("name=" + subObject.get("name").getAsString());
                System.out.println("ide=" + subObject.get("ide").getAsString());
                
            }
            
        } catch (JsonIOException e) {
            e.printStackTrace();
        } catch (JsonSyntaxException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        
    }

}

2.使用Java创建JSON数据

package peixun;

import com.google.gson.JsonArray;
import com.google.gson.JsonObject;

public class TestCreateJSON {

    public static void main(String[] args) {
        //1
        JsonObject object = new JsonObject();
        
        object.addProperty("cat", "it");
        
        //2
        JsonArray array = new JsonArray();
        
        JsonObject lan1 = new JsonObject();
        lan1.addProperty("id", 1);
        lan1.addProperty("name", "Java");
        lan1.addProperty("ide", "Eclipse");
        //添加到数组中
        array.add(lan1);
        JsonObject lan2 = new JsonObject();
        lan1.addProperty("id", 2);
        lan1.addProperty("name", "Swift");
        lan1.addProperty("ide", "Xcode");
        //添加到数组中
        array.add(lan2);
        JsonObject lan3 = new JsonObject();
        lan1.addProperty("id", 3);
        lan1.addProperty("name", "C#");
        lan1.addProperty("ide", "Visual Studio");
        //添加到数组中
        array.add(lan3);
        
        //数组添加到object中
        object.add("languages", array);
        
        //3
        object.addProperty("pop", true);
        
        System.out.println(object.toString());
    }

}