telnetsample.java

telnet connect sample

package hanwha.bpm.tools;

import org.apache.commons.net.telnet.*;

import java.io.*;


public class TelnetSample {
	
	private TelnetClient telnet = new TelnetClient();
	private InputStream in;
	private PrintStream out;
	private String prompt = "weblogic]";
//	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());

			// Log the user on
			readUntil("login: ");
			write(user);
			
			readUntil("Password: ");
			write(password);
			
			// Advance to a prompt
			readUntil(prompt);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

//	public void su(String password) {
//		try {
//			write("su");
//			readUntil("Password: ");
//			write(password);
//			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();
			boolean found = false;
			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();
					}
				}
				
				int value = in.read();
				
				if ( value < 1 ) break;

				ch = (char) value;
			}
		} 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) {
		TelnetSample telnet = null;
		try {
			telnet = new TelnetSample("10.10.9.214", "weblogic", "web111");
			String result = telnet.sendCommand("vmstat");
//			System.out.println("---------------------------");
			System.out.println(result);
			
			result = telnet.sendCommand("ls");
			System.out.println(result);
			
			result = telnet.sendCommand("vmstat");
			System.out.println(result);
			
//			telnet.sendCommand("vmstat 1 1");
//			telnet.
//			telnet.su("root-password");
//			telnet.sendCommand("./ls");
			telnet.disconnect();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if ( telnet != null ) telnet.disconnect();
		}
	}
}