URLConnection

• 애플리케이션과 URL간의 통신연결을 위한 추상클래스
• URL 클래스 객체 생성 → URLConnection 객체 생성

URLConnection 객체 생성

1. URL  클래스 객체 생성

URL 변수명 = new URL("주소");

• 예시
  • 특정서버(ex 네이버) 접속하여 대문페이지 가져오기

URL url = new URL("https://www.naver.com/index.html");

2. URLConnection 객체생성

URLConnection 변수명 = url.openConnection();

• 예시

URLConnection urlConn = url.openConnection();

 

기본적인 헤더정보 출력하기

변수명.getContentType()

URLConnection변수명.getContentType()

• 예시

System.out.println("Content-Type :" + urlConn.getContentType());

---

변수명.getContentEncoding()

URLConnection변수명.getContentEncoding()

• 예시

System.out.println("Encoding :" + urlConn.getContentEncoding());

---

변수명.getContent()

URLConnection변수명.getContent()

• 예시

System.out.println("Content :" + urlConn.getContent());

---

변수명.getHeaderFields: 전체 Header정보 출력

URLConnection변수명.getHeaderFields();

• 예시

Map<String, List<String>> headerMap = urlConn.getHeaderFields();
		
		Iterator<String> iter = headerMap.keySet().iterator();
		while (iter.hasNext()) {
			String key = iter.next();
			System.out.println(key +" : " + headerMap.get(key));
		}
		System.out.println("-------------------------------------------");

---

원본

package kr.or.ddit.basic;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class URLConnectionTest {

	public static void main(String[] args) throws IOException {
		
		//URLConnectionTest => 애플리케이션과 URL간의 통신연결을 위한 추상클래스
		
		//특정서버(ex 네이버) 접속하여 대문페이지 가져오기
		URL url = new URL("https://www.naver.com/index.html");
		
		//URLConnection 객체 생성하기
		URLConnection urlConn = url.openConnection();
		
		//기본적인 헤더정보 출력하기
		
		System.out.println("Content-Type :" + urlConn.getContentType());
		System.out.println("Encoding :" + urlConn.getContentEncoding());
		System.out.println("Content :" + urlConn.getContent());
		System.out.println();
		
		//전체 Header정보 출력
		Map<String, List<String>> headerMap = urlConn.getHeaderFields();
		
		Iterator<String> iter = headerMap.keySet().iterator();
		while (iter.hasNext()) {
			String key = iter.next();
			System.out.println(key +" : " + headerMap.get(key));
		}
		System.out.println("-------------------------------------------");
		
		
	}

}