Java使用SSH登录并启动Tomcat

import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

public class SSHUtil {
	private Channel channel;
    private Session session = null;
    private int timeout = 60000;

    public SSHUtil(final String ipAddress, int port,final String username, final String password) throws Exception {

        JSch jsch = new JSch();
        this.session = jsch.getSession(username, ipAddress, port);
        this.session.setPassword(password);
        this.session.setConfig("StrictHostKeyChecking", "no");
        this.session.setTimeout(this.timeout);
        this.session.connect();
        this.channel = this.session.openChannel("shell");
        this.channel.connect(1000);
    }

    public String runShell(String cmd, String charset) throws Exception {
        String temp = null;

        InputStream instream = null;
        OutputStream outstream = null;
        try {
            instream = this.channel.getInputStream();
            outstream = this.channel.getOutputStream();
            outstream.write(cmd.getBytes());
            outstream.flush();
            TimeUnit.SECONDS.sleep(2);
            if (instream.available() > 0) {
                byte[] data = new byte[instream.available()];
                int nLen = instream.read(data);

                if (nLen < 0) {
                    throw new Exception("network error.");
                }

                temp = new String(data, 0, nLen, "UTF-8");
            }
        }  finally {
            outstream.close();
            instream.close();
        }
        return temp;
    }

    public void close() {
        this.channel.disconnect();
        this.session.disconnect();
    }
    
    public static void main(final String[] args) throws Exception {
        //shutdown.sh
        SSHUtil sshUtil = new SSHUtil("136.16.19.82",22, "root", "123456");
        String res = sshUtil.runShell("/usr/apache-tomcat-7.0.47/bin/startup.sh \n", "utf-8");
        System.out.println(res);
        sshUtil.close();
    }
}