/* * This file is part of "The Java Telnet Application". * * This is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * "The Java Telnet Application" is distributed in the hope that it will be  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. *  * You should have received a copy of the GNU General Public License * along with this software; see the file COPYING.  If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */package de.mud.jta;import de.mud.telnet.TelnetProtocolHandler;import de.mud.terminal.vt320;import java.awt.BorderLayout;import java.awt.Dimension;import java.awt.Graphics;import java.io.InputStream;import java.io.OutputStream;import java.io.IOException;import java.net.Socket;/** * <B>Small Telnet Applet implementation</B><P> * <P> * <B>Maintainer:</B> Matthias L. Jugel * * @version $Id: SmallApplet.java,v 1.3 2000/12/05 11:15:32 marcus Exp $ * @author Matthias L. Jugel, Marcus Mei遪er */public class SmallApplet extends java.applet.Applet implements Runnable {  private final static int debug = 0;  /** hold the host and port for our connection */  private String host, port;  /** hold the socket */  private Socket socket;  private InputStream is;  private OutputStream os;  private Thread reader;  /** the terminal */  private vt320 terminal;  /** the telnet protocol handler */  private TelnetProtocolHandler telnet;  private boolean localecho = false;  /**   * Read all parameters from the applet configuration and   * do initializations for the plugins and the applet.   */  public void init() {    if(debug > 0) System.err.println("jta: init()");    host = getParameter("host");    port = getParameter("port");    // we now create a new terminal that is used for the system    // if you want to configure it please refer to the api docs    terminal = new vt320() {      /** before sending data transform it using telnet (which is sending it) */      public void write(byte[] b) {        try {	  telnet.transpose(b);	} catch(IOException e) {	  System.err.println("jta: error sending data: "+e);	}      }    };    // put terminal into the applet    setLayout(new BorderLayout());    add("Center", terminal);    // then we create the actual telnet protocol handler that will negotiate    // incoming data and transpose outgoing (see above)    telnet = new TelnetProtocolHandler() {      /** get the current terminal type */      public String getTerminalType() {        return terminal.getTerminalID();      }      /** get the current window size */      public Dimension getWindowSize() {        return terminal.getScreenSize();      }      /** notify about local echo */      public void setLocalEcho(boolean echo) {        localecho = true;      }      /** notify about EOR end of record */      public void notifyEndOfRecord() {        // only used when EOR needed, like for line mode      }      /** write data to our back end */      public void write(byte[] b) throws IOException {        os.write(b);      }    };  }  /**   * Start the applet. Connect to the remote host.   */  public void start() {    if(debug > 0)      System.err.println("jta: start()");    // disconnect if we are already connected    if(socket != null) stop();    try {      // open new socket and get streams      socket = new Socket(host, Integer.parseInt(port));      is = socket.getInputStream();      os = socket.getOutputStream();      reader = new Thread(this);      reader.start();    } catch(Exception e) {      System.err.println("jta: error connecting: "+e);      stop();    }  }  /**   * Stop the applet and disconnect.   */  public void stop() {    if(debug > 0)      System.err.println("jta: stop()");    // when applet stops, disconnect    if(socket != null) {      try {        socket.close();      } catch(Exception e) {        System.err.println("jta: could not cleanly disconnect: "+e);      }      socket = null;      try {        reader.stop();      } catch(Exception e) {        // ignore       }      reader = null;    }  }  /**   * Continuously read from remote host and display the data on screen.   */  public void run() {    if(debug > 0)      System.err.println("jta: run()");    byte[] t, b = new byte[256];    int n = 0;    while(n >= 0) try {      do {	  n=telnet.negotiate(b);	  if(debug > 0 && n > 0) 	    System.err.println("jta: \""+(new String(b, 0, n))+"\"");          if(n > 0) terminal.putString(new String(b, 0, n));      } while (n>0);      n = is.read(b);      telnet.inputfeed(b,n);    } catch(IOException e) {      stop();      break;    }  }  public void update(Graphics g) {    paint(g);  }}