/* Makes ClientThread a separate class rather than an inner class
 * to avoid the strange syntax of its constructor call.
 */

import java.net.*;
import java.io.*;
import java.util.StringTokenizer;

public class ThreadedWebServer {
  public static void main(String [] args) {
    try {
        ServerSocket server = 
              new ServerSocket(Integer.parseInt(args[0]));
        while(true) {
          Socket client = server.accept();
          new ClientThread(client);
          System.out.println("ThreadedWebServer Connected to " 
                          + client.getInetAddress());
        }
    }catch(Exception e) {
         e.printStackTrace();
    }
  }
}
  class ClientThread extends Thread {
    Socket client;
    BufferedReader fromClient;
    PrintWriter toClient;
    public ClientThread(Socket c) {
      try {
         client = c;
         fromClient = new BufferedReader
           (new InputStreamReader(client.getInputStream()));
         toClient = new PrintWriter
           (client.getOutputStream(), true);
         start();
      }catch(Exception e) {
         e.printStackTrace();
      }
    }
    public void run() {
      try {
        String s;  
        s=fromClient.readLine();
        StringTokenizer tokens = new StringTokenizer(s);
        if (!(tokens.nextToken()).equals("GET")) {
           toClient.println("HTTP/1.0 501 Not Implemented");
           toClient.println();
        }
        else {
          String filename = tokens.nextToken();
          while (!(s = fromClient.readLine()).equals(""));
          BufferedReader file = 
               new BufferedReader(new FileReader(filename));
          toClient.println("HTTP/1.0 200 OK");
          toClient.println("Content-type: text/plain");
          toClient.println();
          while ((s = file.readLine()) != null)
             toClient.println(s);
          file.close();
        }
        fromClient.close();
        toClient.close();
        client.close();
      }catch(Exception e) {
         e.printStackTrace();
      }
    }      
  }