네트워크

package com.basic;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class InetAddressTest02 {
	public static void main(String [] args) throws Exception{
		BufferedReader reader;
		String url = null;
		InetAddress addr = null;
		
		reader = new BufferedReader(new InputStreamReader(System.in));
		System.out.print("웹사이트 주소를 입력하세요 ->");
		
		url = reader.readLine();
		
		try{
			addr = InetAddress.getByName(url);
		}catch(UnknownHostException e){
			e.printStackTrace();
		}
		System.out.println("==========================");
		//getHostAddress();
		System.out.println(url+"의 IP 번호 = "+addr.getHostAddress());
	}
}

package com.basic;

import java.net.URL;
import java.io.IOException;
import java.net.MalformedURLException;

public class URLEx {
	public static void main(String[] args) throws MalformedURLException, IOException{
		URL url = new URL("http://java.sun.com/index.jsp?name=syh1011#content");
		
		System.out.println("프로토콜 : "+url.getProtocol());
		System.out.println("호스트 : "+url.getHost());
		System.out.println("포트 : "+url.getDefaultPort());
		System.out.println("패스 : "+url.getPath());
		System.out.println("Query: "+url.getQuery());
		System.out.println("reference: "+url.getRef());
		System.out.println("주소: "+url.toExternalForm());
		
	}
}

package com.basic;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

public class NetworkEx4 {
	public static void main(String[] args) {
		URL url = null;
		BufferedReader input = null;
		String address = "http://www.google.co.kr";
		String line = "";

		try{
			//URL : 인터넷 URL 주소를 추상화 하는 클래스 
			url = new URL(address);

			//url.openStream() : URL객체에 저장된 URL주소의 데이터를 InputStream으로 반환
			input = new BufferedReader(new InputStreamReader(url.openStream(),"UTF-8"));

			while((line = input.readLine()) !=null) {
				System.out.println(line);
			}
			input.close();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}