import java.net.*; import java.io.*; import java.util.StringTokenizer; // A pure 1.1 variation of a class that appears in // Core Web Programming from Prentice Hall Publishers. // May be freely used or adapted. // 1998 Marty Hall, http://www.apl.jhu.edu/~hall/java/. //---------------------------------------------------- /** A simple HTTP server that generates a Web page * showing all of the data that it received from * the Web client (usually a browser). To use this, * start it on the system of your choice, supplying * a port number if you want something other than * port 5555. Call this system server.com. Next, * start a Web browser on the same or a different * system, and connect to * http://server.com:5555/whatever. The resultant * Web page will show the data that your browser * sent. For CGI programming, specify * http://server.com:5555/whatever as the * ACTION of your CGI form. You can send GET * or POST data; either way the resultant page * will show what your browser sent. */ public class EchoServer extends NetworkServer { protected int maxInputLines = 25; protected String serverName = "EchoServer 1.0"; //---------------------------------------------------- /** Supply a port number as a command-line * argument. Otherwise port 5555 will be used. */ public static void main(String[] args) { int port = 5555; if (args.length > 0) port = Integer.parseInt(args[0]); EchoServer echoServer = new EchoServer(port, 0); echoServer.listen(); } public EchoServer(int port, int maxConnections) { super(port, maxConnections); } //---------------------------------------------------- /** Overrides the NetworkServer handleConnection * to read each line of data received, save it * into an array of strings, then send it * back embedded inside a PRE element in an * HTML page. */ public void handleConnection(Socket server) throws IOException{ System.out.println (serverName + ": got connection from " + server.getInetAddress().getHostName()); BufferedReader in = SocketUtil.getBufferedReader(server); PrintWriter out = SocketUtil.getPrintWriter(server); String[] inputLines = new String[maxInputLines]; int i; for (i=0; i\n" + "\n" + "\n" + " " + serverName + " Results\n" + "\n" + "\n" + "\n" + "

" + serverName + " Results

\n" + "Here is the request line and request headers\n" + "sent by your browser:\n" + "

");
  }

  //----------------------------------------------------
  // Print bottom of a "standard" Web page.
  
  private void printTrailer(PrintWriter out) {
    out.println
      ("

\n" + "\n" + "\n"); } //---------------------------------------------------- // Normal Web page requests use GET, so this // server can simply read a line at a time. // However, CGI programs can use POST, in which // case we have to determine the number of POST bytes // that are sent so we know how much extra data // to read after the standard HTTP headers. private boolean usingPost(String[] inputs) { return(inputs[0].toUpperCase().startsWith("POST")); } private void readPostData(String[] inputs, int i, BufferedReader in) throws IOException { int contentLength = contentLength(inputs); char[] postData = new char[contentLength]; in.read(postData, 0, contentLength); inputs[++i] = new String(postData, 0, contentLength); } //---------------------------------------------------- // Given a line that starts with CONTENT-LENGTH, // this returns the integer value specified. private int contentLength(String[] inputs) { String input; for (int i=0; i