네이버 책 검색 OPEN API 활용하기

네이버 검색 OPEN API를 활용하기

목 표

책 검색 api의 url에 적절한 파라미터를 세팅해 요청을 보내고 xml형식으로 돌아오는 응답을 잘 읽어서 원하는 정보를 추출

자바코드로 어떻게 url에 요청을 보내고 응답을 읽을 수 있는지.. xml문서에 원하는 값을 어떻게 획득할 수 있는지..

순 서

1. 모델 클래스 생성

package model;
 
public class Book {
    private String title;
    private String link;
    private String image;
    private String author;
    private String price;
    private String discount;
    private String publisher;
    private String pubdate;
    private String isbn;
    private String description;
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getLink() {
        return link;
    }
    public void setLink(String link) {
        this.link = link;
    }
    public String getImage() {
        return image;
    }
    public void setImage(String image) {
        this.image = image;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
    public String getPrice() {
        return price;
    }
    public void setPrice(String price) {
        this.price = price;
    }
    public String getDiscount() {
        return discount;
    }
    public void setDiscount(String discount) {
        this.discount = discount;
    }
    public String getPublisher() {
        return publisher;
    }
    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }
    public String getPubdate() {
        return pubdate;
    }
    public void setPubdate(String pubdate) {
        this.pubdate = pubdate;
    }
    public String getIsbn() {
        return isbn;
    }
    public void setIsbn(String isbn) {
        this.isbn = isbn;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    @Override
    public String toString() {
        return "Book [title=" + title + ", link=" + link + ", image=" + image + ", author=" + author + ", price="
                + price + ", discount=" + discount + ", publisher=" + publisher + ", pubdate=" + pubdate + ", isbn="
                + isbn + ", description=" + description + "]";
    }
    
    
}

2. api 서비스 클래스 생성 ( api 설정, 파싱작업 )

package service;
 
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
 
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
 
import model.Book;
 
public class NaverBookService {
    private static String clientID = "wla82tmYgxtmxGQuvyrO"; //api 사용 신청시 제공되는 아이디
    private static String clientSecret = "ZTMk48WHjf"; //패스워드
 
    public List<Book> searchBook(String keyword, int display, int start) {
        URL url;
        List<Book> list = null;
        try {
            url = new URL("https://openapi.naver.com/v1/search/book.xml?query=" + URLEncoder.encode(keyword, "UTF-8")
                    + (display != 0 ? "&display=" + display : "") + (start != 0 ? "&start=" + start : ""));
            URLConnection urlConn;
 
            //url 연결
            urlConn = url.openConnection();
            urlConn.setRequestProperty("X-naver-Client-Id", clientID);
            urlConn.setRequestProperty("X-naver-Client-Secret", clientSecret);
 
            //파싱 - 팩토리 만들고 팩토리로 파서 생성 (풀 파서 사용)
            XmlPullParserFactory factory; 
 
            factory = XmlPullParserFactory.newInstance();
            XmlPullParser parser = factory.newPullParser();
            parser.setInput((new InputStreamReader(urlConn.getInputStream())));
 
            
            int eventType = parser.getEventType();
            Book b = null;
            while (eventType != XmlPullParser.END_DOCUMENT) {
                switch (eventType) {
                case XmlPullParser.END_DOCUMENT: // 문서의 끝
                    break;
                case XmlPullParser.START_DOCUMENT:
                    list = new ArrayList<Book>();
                    break;
                case XmlPullParser.START_TAG: {
                    String tag = parser.getName();
                    switch (tag) {
                    case "item":
                        b = new Book();
                        break;
                    case "title":
                        if (b != null)
                            b.setTitle(parser.nextText());
                        break;
                    case "link":
                        if (b != null)
                            b.setLink(parser.nextText());
                        break;
                    case "image":
                        if (b != null)
                            b.setImage(parser.nextText());
                        break;
                    case "author":
                        if (b != null)
                            b.setAuthor(parser.nextText());
                        break;
                    case "discount":
                        if (b != null)
                            b.setDiscount(parser.nextText());
                        break;
                    case "publisher":
                        if (b != null)
                            b.setPublisher(parser.nextText());
                        break;
                    case "pubdate":
                        if (b != null)
                            b.setPubdate(parser.nextText());
                        break;
                    case "isbn":
                        if (b != null)
                            b.setIsbn(parser.nextText());
                        break;
                    case "description":
                        if (b != null)
                            b.setDescription(parser.nextText());
                        break;
                    }
                    break;
                }
 
                case XmlPullParser.END_TAG: {
                    String tag = parser.getName();
                    if (tag.equals("item")) {
                        list.add(b);
                        b = null;
                    }
 
                }
 
                }
                eventType = parser.next();
            }
 
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (XmlPullParserException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return list;
    }
}
 

3. 테스트

import model.Book;
import service.NaverBookService;
 
public class App {
    public static void main(String[] args) {
        
        NaverBookService service = new NaverBookService();
        for(Book b : service.searchBook("java", 20, 1))
            System.out.println(b);
    }
}