Hi All,
I couldn't understand why this program doesn't terminate if I send
command? If I don't send the command it does terminate. I am trying to
understand the way to issue sequence of command in telnet server.
public class TelnetSample {
private TelnetClient telnet = new TelnetClient();
private InputStream in;
private PrintStream out;
private char prompt = '.';
public TelnetSample( String server, String user, String password ) {
try {
// Connect to the specified server
telnet.connect( server, 23 );
// Get input and output stream references
in = telnet.getInputStream();
out = new PrintStream( telnet.getOutputStream() );
// Advance to a prompt
readUntil( prompt + " " );
}
catch( Exception e ) {
e.printStackTrace();
}
}
public String readUntil( String pattern ) {
try {
char lastChar = pattern.charAt( pattern.length() - 1 );
StringBuffer sb = new StringBuffer();
char ch = ( char )in.read();
while( true ) {
System.out.print( ch );
sb.append( ch );
if( ch == lastChar ) {
if( sb.toString().endsWith( pattern ) ) {
return sb.toString();
}
}
ch = ( char )in.read();
}
}
catch( Exception e ) {
e.printStackTrace();
}
return null;
}
public void write( String value ) {
try {
out.println( value );
out.flush();
System.out.println( value );
}
catch( Exception e ) {
e.printStackTrace();
}
}
public String sendCommand( String command ) {
try {
write( command );
return readUntil( prompt + " " );
}
catch( Exception e ) {
e.printStackTrace();
}
return null;
}
public void disconnect() {
try {
telnet.disconnect();
}
catch( Exception e ) {
e.printStackTrace();
}
}
public static void main( String[] args ) {
try {
TelnetSample telnet = new TelnetSample( "telehack.com",
"username",
"password" );
telnet.sendCommand( "date" );
telnet.disconnect();
System.out.println("Disconnected");
}
catch( Exception e ) {
e.printStackTrace();
}
}
}
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