java连接telnet进行操作

使用java连接telnet进行操作的注意
1.telnet有VT100 VT52 VT220 VTNT ANSI等协议。
我用vt100。
2.vt100控制码(ansi控制码)过滤的问题,可以过滤，也可以在服务设置不要。
不过滤都是一些乱码。是以\033[***一个字母结尾的格式。
3.中文乱码的问题。
new String(old.getBytes("ISO8859-1"),"GBK")。
4.如何判断读取到最后了。
一有readUntil(),二有使用线程。
5.选择telnet的java包问题，包有很多，比如appache(commons-net-3.1.jar), ganymed(ganymed-ssh2-build210.jar),javaexpect(smart-0.1-SNAPSHOT-jar-with-dependencies.jar)

我使用appache。javaexpect有带的vt100控制码过滤，我没有仔细研究。

6.write要flush()才发送。

package securecrt.ssh2;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.net.SocketException;

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

/**
 * telnet操作类。使用appache的net.Telnet包，对vt100控制代码（即ansi控制码）进行简单过滤。
 * 
 * @author chruan
 * @version 1.0
 */
public class TelnetHelper {
	Object lock = new Object();
	TelnetClient telnet = null;
	String hostname;
	int hostport = 23;
	String user;
	String password;
	private InputStream in;
	private PrintStream out;
	private static final String ORIG_CODEC = "ISO8859-1";
	private static final String TRANSLATE_CODEC = "GBK";

	public TelnetHelper(String hostname, int hostport, String user,
			String password) throws SocketException, IOException {
		super();
		this.hostname = hostname;
		this.hostport = hostport;
		this.user = user;
		this.password = password;

		telnet = new TelnetClient("VT100");// VT100 VT52 VT220 VTNT ANSI
		telnet.connect(hostname, hostport);
		in = telnet.getInputStream();
		out = new PrintStream(telnet.getOutputStream());

		readUntil("login: ");
		write(user);
		write("\n");
		readUntil("Password: ");
		write(password);
		write("\n");
	}

	public void doJob() {
		// restartTerminal();
		counter();
	}

	private void restartTerminal() {
		try {
			readUntil(">");
			write("telnet 0.0.7.74\n");
			readUntil("login: ");
			write("dd\n", 500);
			readToEnd();

			write("dff\n", 200);
			readToEnd();

		} catch (Exception e) {
			e.printStackTrace();
		} finally {

		}
	}

	private void counter() {
		try {
			readUntil(">");
			write("telnet 4.3.4.4\n");
			readUntil("login: ");
			write("dd\n", 1000);
			readToEnd();

			write("\r\n", 200);
			readToEnd();

		} catch (Exception e) {
			e.printStackTrace();
		} finally {

		}
	}

	public void readToEnd() {
		ReadThread readThread = new ReadThread();
		readThread.start();
		try {
			readThread.join();
		} catch (Exception e) {
		}
		readThread = null;
	}

	public void readUntil(String str) {
		char last = str.charAt(str.length() - 1);
		String[] ss;
		try {
			StringBuffer sb = new StringBuffer();
			char c;
			int code = -1;
			boolean ansiControl = false;
			boolean start = true;
			while ((code = (in.read())) != -1) {
				c = (char) code;
				if (c == '\033') {//vt100控制码都是以\033开头的。
					ansiControl = true;
					int code2 = in.read();
					char cc = (char) code2;
					if (cc == '[' || cc == '(') {
					}
				}
				if (!ansiControl) {
					if (c == '\r') {
						String olds = new String(sb.toString().getBytes(
								ORIG_CODEC), TRANSLATE_CODEC);
						System.out.println(olds);
						if (sb.lastIndexOf(str) != -1) {
							break;
						}
						sb.delete(0, sb.length());
					} else if (c == '\n')
						;
					else
						sb.append(c);
					if (sb.lastIndexOf(str) != -1) {
						break;
					}
				}

				if (ansiControl) {
					if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')
							|| c == '"') {
						ansiControl = false;
					}
				}
			}
			System.out.println(new String(sb.toString().getBytes(ORIG_CODEC),
					TRANSLATE_CODEC));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void write(String s) {
		try {
			out.write(s.getBytes());
			out.flush();
			System.out.println(s);
		} catch (Exception e) {
		}
	}

	public void write(String s, int sleep) {
		write(s);
		try {
			Thread.sleep(sleep);
		} catch (Exception e) {
		}
	}

	/**
	 * 完成之后必须关闭
	 */
	public void close() {
		if (out != null)
			out.close();
		if (in != null)
			try {
				in.close();
			} catch (IOException e1) {
			}
		if (telnet != null)
			try {
				telnet.disconnect();
			} catch (IOException e) {
			}
	}

	public static void main(String[] args) {
		String hostname = "44.55.66.77";
		int hostport = 23;
		String user = "user";
		String password = "password";
		TelnetHelper helper = null;
		try {
			helper = new TelnetHelper(hostname, hostport, user, password);
			helper.doJob();

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (helper != null)
				helper.close();
		}
	}

	/**
	 * 读取主线程，负责管理子线程。防止读取时不动了，这时就抛弃读取子线程
	 * @author chruan
	 *
	 */
	class ReadThread extends Thread {
		public void run() {
			synchronized (lock) {//只能一个读取
				SubReadThread sub = new SubReadThread();
				sub.start();
				int last = sub.count;
				while (true) {
					try {
						Thread.sleep(100);
					} catch (InterruptedException e) {
					}
					if (last == sub.count) {
						sub.stop();
						break;
					} else {
						last = sub.count;
					}
				}
				String s = sub.sb.toString();
				try {
					System.out.println(new String(s.getBytes(ORIG_CODEC),
							TRANSLATE_CODEC));
				} catch (UnsupportedEncodingException e) {
					System.out.println(s);
				}
				sub = null;
			}

//			System.out.println("===========ReadThread end=============");
		}
	}

	/**
	 * 读取子线程，完成实际读取
	 * @author chruan
	 *
	 */
	class SubReadThread extends Thread {
		int count = 0;
		StringBuffer sb = new StringBuffer();

		public void read() {
			try {
				char c;
				int code = -1;
				boolean ansiControl = false;
				boolean start = true;
				while ((code = (in.read())) != -1) {
					count++;
					c = (char) code;
					if (c == '\033') {
						ansiControl = true;
						int code2 = in.read();
						char cc = (char) code2;
						count++;
						if (cc == '[' || cc == '(') {
						}
					}
					if (!ansiControl) {
						if (c == '\r') {
							String olds = new String(sb.toString().getBytes(
									ORIG_CODEC), TRANSLATE_CODEC);
							System.out.println(olds);
							sb.delete(0, sb.length());
						} else if (c == '\n')
							;
						else
							sb.append(c);
					}

					if (ansiControl) {
						if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')
								|| c == '"') {
							ansiControl = false;
						}
					}
				}
			} catch (Exception e) {
			}
		}

		public void run() {
			read();
		}
	}
}