[Java] XML데이터 파싱하기

참고영상 : https://www.youtube.com/watch?v=coBTVyj-Ef8&list=PLgICV6Wc1orOrVamkpfmxo44LFw2C1YJZ&index=7

데이터
도서관정보나루 인기대출도서 API: https://www.data4library.kr/loanDataL

추가할 내용

• 검색조건에 따라 url이 변경되도록 처리하기

자바코드

package part06;

import java.io.BufferedInputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.util.Scanner;

public class SearchPopularbookXml {
	public static void main(String[] args) {
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

		try {
			Scanner sc = new Scanner(System.in);
			System.out.print("입력 (남성0, 여성1) :");
			String a = sc.nextLine();

			String encode="";
			encode = URLEncoder.encode(a,"UTF-8");
			
		
			//파싱할 InputStream생성
			DocumentBuilder builder = factory.newDocumentBuilder();
			//1. 웹서버를 제공하는 url에 연결해서 데이터 가져오기
			//1) 접속할 url정보 정의(popularBook_url)
			StringBuffer popularBook_url = new StringBuffer();
			
			String key= "  **개인 인증키 입력**  ";
			popularBook_url.append("http://data4library.kr/api/loanItemSrch");
			popularBook_url.append("?authKey="+key);
			popularBook_url.append("&startDt=2023-01-01");
			popularBook_url.append("&endDt=2023-02-27");
			popularBook_url.append("&gender="+encode);
			
			System.out.println(popularBook_url);
			
			//2) 웹서버에 접속하기 
			URL url = new URL(popularBook_url.toString());

			
			//3) 접속해서 response되는 데이터 읽어오기
			//읽어온 데이터저장 - BufferedInputStream은 InputStream의 하위
			BufferedInputStream xmldata = new BufferedInputStream(url.openStream());
			
			Document document = builder.parse(xmldata); 
			
			//데이터 읽어오기 (root element : docs)
			Element root = document.getDocumentElement();
			System.out.println(root.getTagName());
			NodeList list = root.getElementsByTagName("doc");
			System.out.print("조회갯수 : "+ list.getLength()+"\n");
			System.out.println();
			
			for(int i=0; i<list.getLength(); i++) {
				Node node = list.item(i);
				NodeList node_childList = node.getChildNodes();
				for(int j=0; j<node_childList.getLength(); j++) {
					Node item_child = node_childList.item(j);
					System.out.println(item_child.getNodeName()+" : "+item_child.getTextContent());
				}
				System.out.println();
			}
			
		}catch(Exception e) {
			e.printStackTrace();
		}	
		
	}//main
}//end class

콘솔결과