Kakao Book Search

import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.List;
 
import javax.swing.JOptionPane;
 
import org.apache.http.client.ClientProtocolException;
 
import com.google.gson.Gson;
 
import study.java.helper.FileHelper;
import study.java.helper.GsonHelper;
import study.java.helper.HttpHelper;
import study.java.model.KakaoBeans;
import study.java.model.KakaoBeans.Documents;
 
/**
 * @file_name : Main.java
 * @author : 오태현
 * @description : 책 제목을 입력 받아 카카오 책 검색 API를 통해 검색결과를 csv형식 파일로 저장
 * @last_update : 2018-12-18
 */
public class Main {
    public static void main(String[] args) throws ClientProtocolException, IOException {
        String bookTitle = JOptionPane.showInputDialog("책 제목을 입력하세요.");
 
        String filePath = System.getProperty("user.home") + "\\Desktop\\책 [" + bookTitle + "] 검색결과.csv";
 
        InputStream is = HttpHelper.getInstance().getWebData("https://dapi.kakao.com/v3/search/book?target=title&query="
                + URLEncoder.encode(bookTitle, "UTF-8") + "&size=50", "UTF-8");
        if (is == null) {
            System.out.println("데이터 다운로드 실패");
        }
        // GsonHelper로 데이터를 String으로 변환
        String isString = GsonHelper.getInstance().getGSONObject(is, "UTF-8");
        // Gson 객체 생성
        Gson gson = new Gson();
        // Beans를 이용해 json 접근
        KakaoBeans kb = gson.fromJson(isString, KakaoBeans.class);
        // 바로 배열이 나오기때문에 List로 해당 값에 접근
        List<Documents> documents = kb.getDocuments();
 
        String line = "책 이름,출판사,정가,판매가\n";
 
        for (int i = 0; i < documents.size(); i++) {
            Documents item = documents.get(i);
            line += item.getSale_price() == -1 ? item.toString() + "품절\n"
                    : item.toString() + item.getSale_price() + "\n";
        }
 
        FileHelper.getInstance().writeString(filePath, line, "EUC-KR");
    }
}
 

package study.java.model;
 
import java.util.List;
 
import com.google.gson.annotations.SerializedName;
 
/**
 * @file_name : KakaoBeans.java
 * @author : 오태현
 * @description : 책 제목, 출판사, 정가, 판매가를 기준으로하는 Beans 설정
 * @last_update : 2018-12-18
 */
public class KakaoBeans {
    @SerializedName("documents")
    private List<Documents> documents;
 
    public List<Documents> getDocuments() {
        return documents;
    }
 
    public void setDocuments(List<Documents> documents) {
        this.documents = documents;
    }
 
    @Override
    public String toString() {
        return "" + documents;
    }
 
    public class Documents {
        @SerializedName("title")
        private String title;
        @SerializedName("publisher")
        private String publisher;
        @SerializedName("price")
        private int price;
        @SerializedName("sale_price")
        private int sale_price;
 
        public String getTitle() {
            return title;
        }
 
        public void setTitle(String title) {
            this.title = title;
        }
 
        public String getPublisher() {
            return publisher;
        }
 
        public void setPublisher(String publisher) {
            this.publisher = publisher;
        }
 
        public int getPrice() {
            return price;
        }
 
        public void setPrice(int price) {
            this.price = price;
        }
 
        public int getSale_price() {
            return sale_price;
        }
 
        public void setSale_price(int sale_price) {
            this.sale_price = sale_price;
        }
 
        @Override
        public String toString() {
            return title.replace(",", " ") + "," + publisher + "," + price + ",";
        }
    }
}