Java 执行linux指令

import java.io.InputStream;
import java.util.Properties;

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

public class JSCHUtil {

private static JSCHUtil instance;

private JSCHUtil() {
}

public static JSCHUtil getInstance() {
    if (instance == null) {
        instance = new JSCHUtil();
    }

    return instance;
}

private Session getSession(String host, int port, String ueseName)
    throws Exception {
    JSch jsch = new JSch();
    Session session = jsch.getSession(ueseName, host, port);

    return session;
}

public Session connect(String host, int port, String ueseName,
    String password) throws Exception {
    Session session = getSession(host, port, ueseName);
    session.setPassword(password);

    Properties config = new Properties();
    //不公钥验证
    config.setProperty("StrictHostKeyChecking", "no");
    session.setConfig(config);
    session.connect();

    return session;
}

public void execCmd(Session session, String command)
    throws Exception {
    if (session == null) {
        throw new RuntimeException("Session is null!");
    }

    ChannelExec exec = (ChannelExec) session.openChannel("exec");
    InputStream in = exec.getInputStream();
    byte[] b = new byte[1024];
    exec.setCommand(command);
    exec.connect();
    while (in.read(b) > 0) {
    	System.out.println(new String(b));
    }
    exec.disconnect();

}

public void clear(Session session) {
    if ((session != null) && session.isConnected()) {
        session.disconnect();
        session = null;
    }
}

public static void main(String[] args) throws Exception {
    Session session = JSCHUtil.getInstance()
                              .connect("192.168.0.15", 22, "xx", "@#$%123()");
    String cmd = "cd /home/ym" + ";" + "/usr/tcl/bin/expect test.sh";
    JSCHUtil.getInstance().execCmd(session, cmd);
}

}