1  import java.io.InputStream;

  2  import java.io.IOException;

  3  import java.io.OutputStream;

  4  import java.io.PrintWriter;

  5  import java.net.Socket;

  6  import java.util.Scanner;

  7  

  8  /**

  9     This program demonstrates how to use a socket to communicate

 10     with a web server. Supply the name of the host and the

 11     resource on the command-line, for example

 12     java WebGet horstmann.com index.html

 13  */

 14  public class WebGet

 15  {

 16     public static void main(String[] args) throws IOException

 17     {

 18        // Get command-line arguments

 19  

 20        String host;

 21        String resource;

 22  

 23        if (args.length == 2)

 24        {

 25           host = args[0];

 26           resource = args[1];

 27        }

 28        else

 29        {

 30           System.out.println("Getting / from horstmann.com");

 31           host = "horstmann.com";

 32           resource = "/";

 33        }

 34  

 35        // Open socket

 36  

 37        final int HTTP_PORT = 80;

 38        Socket s = new Socket(host, HTTP_PORT);

 39  

 40        // Get streams

 41        

 42        InputStream instream = s.getInputStream();

 43        OutputStream outstream = s.getOutputStream();

 44  

 45        // Turn streams into scanners and writers

 46  

 47        Scanner in = new Scanner(instream);

 48        PrintWriter out = new PrintWriter(outstream);      

 49  

 50        // Send command

 51  

 52        String command = "GET " + resource + " HTTP/1.1\n" 

 53           + "Host: " + host + "\n\n";

 54        out.print(command);

 55        out.flush();

 56  

 57        // Read server response

 58  

 59        while (in.hasNextLine())

 60        {

 61           String input = in.nextLine();

 62           System.out.println(input);

 63        }

 64  

 65        // Always close the socket at the end

 66  

 67        s.close();      

 68     }

 69  }