simple Request/Response http scenario over TCP.

socket_get_http_request.java

package org.tarrsalah.http_clients;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.Socket;
import java.net.URL;
import java.util.concurrent.CountDownLatch;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * SimpleHttpClient.java (UTF-8)
 *
 * Mar 27, 2014
 *
 * @author tarrsalah.org
 */
public class SimpleHttpClient {

	private static final String CR = "\r\n";
	private static final String CRCR = CR + CR;

	public static void main(String[] args) {

		if (args.length < 1) {
			System.out.println("Usage : SimpleHttpClient <url>");
			return;
		}
		try {
			URL url = new URL(args[0]);
			String host = url.getHost();
			String path = url.getPath();
			int port = url.getPort();
			if (port < 80) {
				port = 80;
			}

			//Construct and send the HTTP request
			String request = new StringBuilder("GET ")
					.append(path)
					.append(" HTTP/1.1")
					.append(CR)
					.append("Connection: Close")
					.append(CRCR)
					.toString();
			
			// Send the request over the socket
			// Open a TCP connection
			try (Socket socket = new Socket(host, port); // Send the request over the socket
					PrintWriter writer = new PrintWriter(socket.getOutputStream());
					BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()))) {
				writer.print(request);
				writer.flush();
				// Read the response
				reader.lines().forEach(System.out::println);
			}
			System.out.println("Finished");
		} catch (MalformedURLException ex) {
			Logger.getLogger(SimpleHttpClient.class.getName()).log(Level.SEVERE, null, ex);
		} catch (IOException ex) {
			Logger.getLogger(SimpleHttpClient.class.getName()).log(Level.SEVERE, null, ex);
		}
	}
}