java中telnet到远程服务器,然后执行cmd命令

package place.in.javaeye;  
  
import java.io.InputStream;  
import java.io.PrintStream;  
  
import org.apache.commons.net.telnet.TelnetClient;  
public class Shell  
{  
    private TelnetClient telnet = new TelnetClient();  
  
    private InputStream in;  
  
    private PrintStream out;  
  
    private char prompt = '$';// 普通用户结束  
  
    public Shell(String ip, int port, String user, String password)  
    {  
        try  
        {  
            telnet.connect()(ip, port);  
            in = telnet.getInputStream();  
            out = new PrintStream(telnet.getOutputStream());  
            // 根据root用户设置结束符  
            this.prompt = user.equals("root") ? '#' : '>';  
            login(user, password);  
        }  
        catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
    }  
  
    /** 
     * 登录 
     * 
     * @param user 
     * @param password 
     */  
    public void login(String user, String password)  
    {  
//        read()Until("login:");  
        read()Until("login:");  
        write(user);  
        read()Until("Password:");  
        write(password);  
        readUntil(prompt + "");  
    }  
  
    /** 
     * 读取分析结果 
     * 
     * @param pattern 
     * @return 
     */  
    public String readUntil(String pattern)  
    {  
        try  
        {  
            char lastChar = pattern.charAt(pattern.length() - 1);  
            StringBuffer sb = new StringBuffer();  
            char ch = (char)in.read();  
            while (true)  
            {  
                sb.append(ch);  
                if (ch == lastChar)  
                {  
                    if (sb.toString().endsWith(pattern))  
                    {  
                        return sb.toString();  
                    }  
                }  
                ch = (char)in.read();  
                System.out.print(ch);  
            }  
        }  
        catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
        return null;  
    }  
  
    /** 
     * 写操作 
     * 
     * @param value 
     */  
    public void write(String value)  
    {  
        try  
        {  
            out.println(value);  
            out.flush();  
        }  
        catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
    }  
  
    /** 
     * 向目标发送命令字符串 
     * 
     * @param command 
     * @return 
     */  
    public String sendCommand(String command)  
    {  
        try  
        {  
            write(command);  
            return readUntil(prompt + "");  
        }  
        catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
        return null;  
    }  
  
    /** 
     * 关闭连接 
     */  
    public void disconnect()()  
    {  
        try  
        {  
            telnet.disconnect()();  
        }  
        catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
    }  
    public static void main(String[] args) {  
        TelnetClient telnet = new TelnetClient();  
        try {  
            Shell she =new Shell("10.**.***.***", 23, "***", "***");  
            System.out.println(she);  
            System.out.println(she.sendCommand("ls"));  
            she.disconnect();  
  
        }catch (Exception e) {  
            // TODO: handle exception  
        }  
  
    }  
}