[Java] 111. Json 파싱하기 (2) - (3) Object+Array

[Java] 111. Json 파싱하기 (2) - (3) Object+Array

1. 단일 Object-Array 파싱하기

2. Object-Array List 파싱하기

---

1. 단일 Object-Array 파싱하기

 

https://jsonplaceholder.typicode.com/users/1

위 사이트의 데이터를 파싱해보자.

 

(1) User

package practice;

import javax.imageio.plugins.tiff.GeoTIFFTagSet;
import javax.print.attribute.standard.Chromaticity;

import com.sun.nio.sctp.PeerAddressChangeNotification.AddressChangeEvent;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
@Setter
@Getter
@AllArgsConstructor
@NoArgsConstructor
public class User {
	private int id;
	private String username;
	private String email;
	private Address address;
	
	private String phone;
	private String webSite;
	private Company company;

	@Override
	public String toString() {
		return "User [id=" + id + ", username=" + username + ", email=" + email + ", address=" + address + ", phone="
				+ phone + ", webSite=" + webSite + ", company=" + company + "]";
	}

	public class Address{
		private String streetString;
		private String suite;
		private String city;
		private String zipcode;
		private Geo geo;
		@Override
		public String toString() {
			return "Address [streetString=" + streetString + ", suite=" + suite + ", city=" + city + ", zipcode="
					+ zipcode + ", geo=" + geo + "]";
		}
	}
	
	public class Geo{
		private double lat;
		private double lng;
		@Override
		public String toString() {
			return "Geo [lat=" + lat + ", lng=" + lng + "]";
		}
		
	}
	
	public class Company{
		private String name;
		private String catchPhrase;
		private String bs;
		@Override
		public String toString() {
			return "Company [name=" + name + ", catchPhrase=" + catchPhrase + ", bs=" + bs + "]";
		}
		
	}
}

 

(2) MyHttpUsersClient

package practice;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;

public class MyHttpUsersClient {
	
	public static void main(String[] args) {
		
		URL url;
		try {
			url = new URL("https://jsonplaceholder.typicode.com/users/1");
			HttpURLConnection conn=(HttpURLConnection)url.openConnection();
			conn.setRequestMethod("GET");
			conn.setRequestProperty("Content-type", "application/json");
			
			int responseCode=conn.getResponseCode();
			System.out.println("response code : "+responseCode);
			
			BufferedReader in=new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String inputLine;
			StringBuffer buffer=new StringBuffer();
			while((inputLine=in.readLine())!=null){
				buffer.append(inputLine);
			}
			in.close();
			
			System.out.println(buffer.toString());
			System.out.println("-----------------------------");
			
			Gson gson=new GsonBuilder().setPrettyPrinting().create();
			User userDTO=gson.fromJson(buffer.toString(), User.class);
			
			System.out.println(userDTO.getEmail());
			System.out.println(userDTO.getPhone());
			System.out.println(userDTO.getUsername());
			
			
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

}

---

2. Object-Array List 파싱하기

https://jsonplaceholder.typicode.com/users

 

(1) User class

package practice;

import javax.imageio.plugins.tiff.GeoTIFFTagSet;
import javax.print.attribute.standard.Chromaticity;

import com.sun.nio.sctp.PeerAddressChangeNotification.AddressChangeEvent;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
@Setter
@Getter
@AllArgsConstructor
@NoArgsConstructor
public class User {
	private int id;
	private String username;
	private String email;
	private Address address;
	
	private String phone;
	private String webSite;
	private Company company;

	@Override
	public String toString() {
		return "User [id=" + id + ", username=" + username + ", email=" + email + ", address=" + address + ", phone="
				+ phone + ", webSite=" + webSite + ", company=" + company + "]";
	}

	public class Address{
		private String streetString;
		private String suite;
		private String city;
		private String zipcode;
		private Geo geo;
		@Override
		public String toString() {
			return "Address [streetString=" + streetString + ", suite=" + suite + ", city=" + city + ", zipcode="
					+ zipcode + ", geo=" + geo + "]";
		}
	}
	
	public class Geo{
		private double lat;
		private double lng;
		@Override
		public String toString() {
			return "Geo [lat=" + lat + ", lng=" + lng + "]";
		}
		
	}
	
	public class Company{
		private String name;
		private String catchPhrase;
		private String bs;
		@Override
		public String toString() {
			return "Company [name=" + name + ", catchPhrase=" + catchPhrase + ", bs=" + bs + "]";
		}
		
	}
}

 

(2) MyHttpUsersClient

package practice;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;

public class MyHttpUsersClient2 {
	
	public static void main(String[] args) {
		
		URL url;
		try {
			url = new URL("https://jsonplaceholder.typicode.com/users");
			HttpURLConnection conn=(HttpURLConnection)url.openConnection();
			conn.setRequestMethod("GET");
			conn.setRequestProperty("Content-type", "application/json");
			
			int responseCode=conn.getResponseCode();
			System.out.println("response code : "+responseCode);
			
			BufferedReader in=new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String inputLine;
			StringBuffer buffer=new StringBuffer();
			while((inputLine=in.readLine())!=null){
				buffer.append(inputLine);
			}
			in.close();
			
			System.out.println("-----------------------------");
			
			Gson gson=new GsonBuilder().setPrettyPrinting().create();
			
			Type userType=new TypeToken<List<User>>() {}.getType();
			List<User> userList=gson.fromJson(buffer.toString(),userType);
			
			System.out.println(userList.size());
			for(User u:userList) {
				System.out.println(u.toString());
				System.out.println();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

}