Spring JSON [17-2]

 JSON

REST API 1

 

REST?

REST 구체적 개념

REST 장단점

REST 필요 이유

REST 구성 요소

REST API란

RESTful?

 

REST API 2 ( 데이터 표현형식)

BookDTO.java

package com.vcx.dd;

public class BookDTO {

	
	private String title;
	private int price;
	private String company;
	private int page;
	
	public BookDTO() {
		super();
		// TODO Auto-generated constructor stub
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public int getPrice() {
		return price;
	}

	public void setPrice(int price) {
		this.price = price;
	}

	public String getCompany() {
		return company;
	}

	public void setCompany(String company) {
		this.company = company;
	}

	public int getPage() {
		return page;
	}

	public void setPage(int page) {
		this.page = page;
	}

	@Override
	public String toString() {
		return "BookDTO [title=" + title + ", price=" + price + ", company=" + company + ", page=" + page + "]";
	}

	public BookDTO(String title, int price, String company, int page) {
		super();
		this.title = title;
		this.price = price;
		this.company = company;
		this.page = page;
	}
	
	
}

Project01.java

package com.vcx.dd;

import java.util.ArrayList;
import java.util.List;

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

public class Project01 {

	public static void main(String[] args)
	{
		//1.Object(BookDTO) -> JSON(String) : 객체를 JSON으로 변한하기
		BookDTO dto = new BookDTO("자바", 21000, "에이콘", 670);
		Gson g = new Gson();
		String json = g.toJson(dto);
		System.out.println(json);
		//{"title" : "자바", "price" : 21000, "company":"에이콘", "page":670}
		
		//2.JSON(String) -> Object(BookDTO) : JSON을 객체로 변환하기
		BookDTO dtol = g.fromJson(json, BookDTO.class);
		System.out.println(dtol);
		//BookDTO [title=자바, price=21000, company=에이콘, page=670]
		System.out.println(dtol.getTitle()+"\t"+dtol.getPrice());
		
		//3.Object(List<BookDTO>) -> JSON(String) : [{},{}...] 배열을 JSON으로 바꾸기
		List<BookDTO> lst = new ArrayList<BookDTO>();
		lst.add(new BookDTO("자바1", 21000, "에이콘1", 570));
		lst.add(new BookDTO("자바2", 31000, "에이콘2", 670));
		lst.add(new BookDTO("자바3", 11000, "에이콘3", 370));

		String lstJson = g.toJson(lst);
		System.out.println(lstJson);
		
		//4.JSON(String) -> Object(List<BookDTO>)
		List<BookDTO> lstl = g.fromJson(lstJson, new TypeToken<List<BookDTO>>() {}.getType());
		
		for(BookDTO vo : lstl)
		{
			System.out.println(vo);
		}
	}
}

console

JSON API 활용

1.step1

		//json object 만들기
		JSONObject student1 = new JSONObject();
		JSONObject student2 = new JSONObject();
		
		student1.put("name", "홍길동");
		student1.put("phone", "010-1111-1111");
		student1.put("address", "서울");
		
		student2.put("name", "나길동");
		student2.put("phone", "010-2222-2222");
		student2.put("address", "광주");
		
		System.out.println(student1);
		System.out.println(student2);

2.step2

//배열에 넣어주기(ArrayList)
		JSONArray students = new JSONArray();
		
		students.put(student1);
		students.put(student2);

3.step3

		//Object로 만들어주기
		JSONObject object = new JSONObject();
		object.put("students", students);
		System.out.println(object.toString(2));

result

 

---

 

info.json

Project03.java

package com.json.dd;

import java.io.InputStream;

import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;

public class Project03 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		String src = "info.json";
		InputStream is = Project03.class.getResourceAsStream(src);
		
		if(is==null)
		{
			throw new NullPointerException("파일이 존재하지 않습니다.");
		}
		
		JSONTokener tokener = new JSONTokener(is);
		
		JSONObject object = new JSONObject(tokener);
		
		JSONArray students = object.getJSONArray("students");
		for(int i = 0; i<students.length(); i++)
		{
			JSONObject student = (JSONObject)students.get(i);
			System.out.println(student.get("name")+"\t");
			System.out.println(student.get("address")+"\t");
			System.out.println(student.get("phone"));
			
		}
	}

}

 

Console

---

 

위도와 경도 위치

 

1번.

 

2번

 

package com.vcx.dd;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Date;

import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;

public class Project04 {
	
	public static void map_service(String point_x, String point_y, String address)
		{
			String URL_STATICMAP = "https://naveropenapi.apigw.ntruss.com/map-static/v2/raster?";
			
			try {
				
				//네이버 전달 url 생성 // 위도와 경도를 변수처리한다.
			String pos = URLEncoder.encode(point_x + " " + point_y,"UTF-8");
			String url = URL_STATICMAP;
			url += "center=" + point_x + "," + point_y;
			url += "&level=16&w=700&h=500";
			url += "&markers=type:t|size:mid|pos:" +pos+"|label:"+URLEncoder.encode(address,"UTF-8");
			
			URL u = new URL(url);
			HttpURLConnection con = (HttpURLConnection)u.openConnection();
			con.setRequestMethod("GET");
			con.setRequestProperty("X-NCP-APIGW-API-KEY-ID", "1w1vepnes5");
			con.setRequestProperty("X-NCP-APIGW-API-KEY", "XfI1h7i9AZFuNWv5GjeTIuWzzKD3WjH6XjM1bLjM");
			
			int responseCode = con.getResponseCode();
			
			BufferedReader br;
			if(responseCode == 200)
			{
				InputStream is = con.getInputStream();
				int read = 0;
				byte[] bytes = new byte[1024];
				String tempname = Long.valueOf(new Date().getTime()).toString();
				File f = new File(tempname + ".jpg");
				f.createNewFile();
				OutputStream outputStream = new FileOutputStream(f);
				while ((read = is.read(bytes)) != -1)
				{
					outputStream.write(bytes, 0 , read);
				}
				is.close();
			}
			else
			{
				br = new BufferedReader(new InputStreamReader(con.getErrorStream()));
				String inputLine;
				StringBuffer response = new StringBuffer();
				while((inputLine = br.readLine())!=null)
				{
					response.append(inputLine);
				}
				br.close();
				
				System.out.println(response.toString());
			}
			} 
			catch (Exception e) {
				// TODO Auto-generated catch block
				System.out.println(e);
			}
		}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		String client_id = "1w1vepnes5";
		String client_secret = "XfI1h7i9AZFuNWv5GjeTIuWzzKD3WjH6XjM1bLjM";
		
		BufferedReader io = new BufferedReader(new InputStreamReader(System.in));
		try
		{
			System.out.println("주소를 입력하세요");
			String address=io.readLine();
			String addr=URLEncoder.encode(address, "UTF-8");
			String reqUrl = "https://naveropenapi.apigw.ntruss.com/map-geocode/v2/geocode?query="+addr;
			URL url = new URL(reqUrl);
			HttpURLConnection con = (HttpURLConnection) url.openConnection();
			con.setRequestMethod("GET");
			con.setRequestProperty("X-NCP-APIGW-API-KEY-ID",client_id );
			con.setRequestProperty("X-NCP-APIGW-API-KEY", client_secret);
			
			BufferedReader br;
			int responseCode = con.getResponseCode();
			
			if(responseCode == 200)
			{
				br = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8"));
				
			}
			else
			{
				br = new BufferedReader(new InputStreamReader(con.getErrorStream()));
			}
			
			//임시저장소
			String line;
			//StringBuffer 사용하는 이유는 String으로 사용한다면 기존껄 놔두고 새로 생성.
			//StringBuffer는 기존꺼에 계속 더해져서 만들어가기때문에 용량 공간낭비를 하지 않는다.
			StringBuffer response = new StringBuffer();
			
			while((line=br.readLine())!= null)
			{
				response.append(line);
			}
			br.close();
			
			//json을 문자열로 생성
			JSONTokener tokener = new JSONTokener(response.toString());
			JSONObject object = new JSONObject(tokener);
			System.out.println(object.toString());
			
			String x = null;
			String y = null;
			String z = null;
			JSONArray arr=object.getJSONArray("addresses");
			for(int i=0; i<arr.length(); i++)
			{
				JSONObject temp = (JSONObject) arr.get(i);
				System.out.println("address :" + temp.get("roadAddress"));
				System.out.println("jibunAddress :" + temp.get("jibunAddress"));
				System.out.println("경도 :" + temp.get("x"));
				System.out.println("위도 :" + temp.get("y"));
				
				x = (String) temp.get("x");
				y = (String) temp.get("y");
				z = (String) temp.get("roadAddress");
			}
			map_service(x,y,z);
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
}

 

 

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NAVER CLOUD PLATFORM

 

참고 사이트 : JSON Viewer [ https://codebeautify.org/jsonviewer ]

Best JSON Viewer and JSON Beautifier Online