import java.io.InputStream;
import java.io.PrintStream;
import nl.yenlo.speedtouch.exception.TelnetTerminalException;
import org.apache.commons.net.telnet.TelnetClient;

/**
*
* @author Steve Liem
*/
public class AutomatedTelnetClient {

private TelnetClient telnet = new TelnetClient();
private InputStream in;
private PrintStream out;
private String prompt = “>”;

public AutomatedTelnetClient(String server, String user, String password) throws Exception {
// Connect to the specified server
telnet.connect(server, 23);

// Get input and output stream references
in = telnet.getInputStream();
out = new PrintStream(telnet.getOutputStream());

// Log the user on
readUntil(“Username : “);
write(user);
readUntil(“Password : “);
write(password);

// Advance to a prompt
readUntil(prompt);
}

public String readUntil(String pattern) throws Exception {
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 (sb.toString().endsWith(“Closing connection”)) {
throw new TelnetTerminalException(“Wrong Telnet arguments passed”);
}
if (sb.toString().endsWith(prompt) && !pattern.equals(prompt)) {
return sb.toString();
}
if (ch == lastChar) {
if (sb.toString().endsWith(pattern)) {
return sb.toString();
}
}
ch = (char) in.read();
}
}

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();
}
}

}

/**
* Used for throwing an Excpetion when a wrong Telnet command is executed.
*
* @author Steve Liem
*/
public class TelnetTerminalException extends Exception {
private static final long serialVersionUID = -2969598230165607465L;

public TelnetTerminalException() {
super();
}

public TelnetTerminalException(String msg) {
super(msg);
}
}