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  private final int TELNET__DEFAULT_PORT=23;
  private final int CONNECT_TIMEOUT=3000; //ms
 
...
...
...
 
    boolean isOK=false;
    TelnetClient tc=new TelnetClient();
 
    try
    {
      tc=new TelnetClient();
      tc.setDefaultTimeout(this.CONNECT_TIMEOUT);
      tc.connect(this.IP, this.port);
      isOK=true;
    }
    catch(Exception e)
    {
      logger.error("Error occurred when telnet to ["+this.IP+":"+this.port+"], -> "+e.toString());
      isOK=false;
    }

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  /**
   * 改寫SocketFactory給TelnetClient用
   * @author http://www.ioncannon.net/java/132/connection-timeouts-with-the-apache-commons-telnetclient/
   * @author RoseRoo (modify)
   */
  private static class TimeoutSockectFactory implements SocketFactory
  {
    private int CONNECT_TIMEOUT=0;
 
    /**
     * @deprecated
     */
    public TimeoutSockectFactory()
    {}
 
    /**
     * Init. a new socket factory
     * @param int - time out in millisecond
     */
    public TimeoutSockectFactory(int timeOut)
    {this.CONNECT_TIMEOUT=timeOut;}
 
    public Socket createSocket(String hostname, int port) throws IOException
    {
      Socket socket=new Socket();
      socket.connect(new InetSocketAddress(hostname, port), this.CONNECT_TIMEOUT);
      return socket;
    }
 
    public Socket createSocket(InetAddress hostAddress, int port) throws IOException
    {
      Socket socket=new Socket();
      socket.connect(new InetSocketAddress(hostAddress, port), this.CONNECT_TIMEOUT);
      return socket;
    }
 
    public Socket createSocket(String remoteHost, int remotePort, InetAddress localAddress, int localPort) throws IOException
    {return new Socket();}
 
    public Socket createSocket(InetAddress remoteAddress, int remotePort, InetAddress localAddress, int localPort) throws IOException
    {return new Socket();}
 
    public ServerSocket createServerSocket(int port) throws IOException
    {return new ServerSocket();}
 
    public ServerSocket createServerSocket(int port, int backlog) throws IOException
    {return new ServerSocket();}
 
    public ServerSocket createServerSocket(int port, int backlog, InetAddress bindAddress) throws IOException
    {return new ServerSocket();}
  }

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TelnetClient.setSocketFactory(new TimeoutSockectFactory(毫秒逾時設定));