import java.io.*; import java.net.*; import java.util.Scanner; /** * Demonstration of getting a page from www.cs.dartmouth.edu via a socket * * @author Chris Bailey-Kellogg, Dartmouth CS 10, Fall 2012 * @author Travis Peters, Dartmouth CS 10, Winter 2015 (updated) * @author Tim Pierson, Dartmouth CS 10, Winter 2018 (updated PrintWriter to properly output end of line) */ public class WWWSocket { public static void main(String[] args) throws Exception { // System.in is kind of the counterpart to System.out (for user input); // A scanner obj. allows you to read input using the .nextLine() method. Scanner console = new Scanner(System.in); while (true) { System.out.print("what page from www.cs.dartmouth.edu? (e.g., ~tjp/cs10_/index.html): "); String page = console.nextLine(); /* * OUPUT STREAM == *your* output stream (i.e., what you write to some server). * INPUT STREAM == *your* input stream (i.e., what other computers (server) are writing to you). */ // Open a socket to WWW (port 80) and ask it to GET the page String host = "www.cs.dartmouth.edu"; Socket sock = new Socket(host, 80); PrintWriter out = new PrintWriter(sock.getOutputStream()); out.print("GET /"+page+" HTTP/1.1\r\n"); out.print("Host: "+host+"\r\n\r\n"); out.flush(); // Read back the response from WWW on the socket BufferedReader in = new BufferedReader(new InputStreamReader(sock.getInputStream())); String line; while ((line = in.readLine()) != null) { System.out.println(line); } // Clean up shop out.close(); in.close(); sock.close(); } } }
