[Java] XML데이터 파싱해서 JSON으로 변환

참고자료
1. https://hianna.tistory.com/626
2. https://www.delftstack.com/ko/howto/java/how-to-convert-hashmap-to-json-object-in-java/

1. 방법

maven - json-simple라이브러리 추가

    <dependency>
      <groupId>com.googlecode.json-simple</groupId>
      <artifactId>json-simple</artifactId>
      <version>1.1.1</version> 
    </dependency>

2. java코드

package part08;

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

import javax.xml.parsers.DocumentBuilderFactory;

import org.json.simple.JSONObject;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import java.util.HashMap;
import java.util.Scanner;

public class FinalSearchPopBookXml {
	private static String getTagValue(String tag, Element eElement) {
		NodeList nList = eElement.getElementsByTagName(tag).item(0).getChildNodes();
		Node nValue = (Node) nList.item(0);
		if (nValue == null)
			return null;

		return nValue.getNodeValue();
	}//getTagValue()

	public static void main(String[] args) {
		try {
			//검색조건 입력
			Scanner sc = new Scanner(System.in);
			System.out.print("입력 (남성0, 여성1) :");
			String a = sc.nextLine();

			String encode="";
			encode = URLEncoder.encode(a,"UTF-8");
			
			//정보나루 데이터 url
			StringBuffer popularBook_url = new StringBuffer();
			
			String key= " **인증키 입력** ";
			popularBook_url.append("http://data4library.kr/api/loanItemSrch");
			popularBook_url.append("?authKey="+key); //인증키
			popularBook_url.append("&startDt="+"2023-01-01");
			popularBook_url.append("&endDt="+"2023-02-27");
			popularBook_url.append("&gender="+encode); //남성0, 여성1
			
			System.out.println(popularBook_url);
			
			//xml파일(url) 파싱
			URL url = new URL(popularBook_url.toString());
			BufferedInputStream xmldata = new BufferedInputStream(url.openStream());
			Document documentInfo= DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(xmldata);

			//xml 데이터 읽기
			NodeList aList = documentInfo.getElementsByTagName("doc");
			System.out.println(aList.getLength());
			for (int i=0; i<aList.getLength(); i++) {
				Node nNode = aList.item(i);
				if(nNode.getNodeType()==Node.ELEMENT_NODE) {
					Element eElement=(Element) nNode;
					
					//HashMap -> json
					HashMap<String, String> map = new HashMap<String, String>();
					map.put("no", getTagValue("no", eElement));
					map.put("bookname", getTagValue("bookname", eElement));
					map.put("authors", getTagValue("authors", eElement));
					map.put("publisher", getTagValue("publisher", eElement));
					map.put("publication_year", getTagValue("publication_year", eElement));
					map.put("isbn", getTagValue("isbn13", eElement));
					map.put("bookImageURL", getTagValue("bookImageURL", eElement));
					
					JSONObject popularBook =  new JSONObject(map);
					System.out.println(popularBook);

					
					//변수에 담기
//					String bookname = getTagValue("bookname", eElement);
//					String authors = getTagValue("authors", eElement);
//					String publisher = getTagValue("publisher", eElement);
//					String publication_year = getTagValue("publication_year", eElement);
//					String isbn = getTagValue("isbn13", eElement);
//					String bookImageURL = getTagValue("bookImageURL", eElement);
//
//					System.out.println(bookname);
				}
			}
		}catch(Exception e) {
			e.printStackTrace();
		}	
		
	}//main
}//class
												

3. 콘솔 출력