通过 JSch 外壳执行多个命令

我试图使用JSch库通过SSH协议执行多个命令。但我似乎卡住了，找不到任何解决方案。该方法每个会话只能执行单个命令。但我想按顺序执行命令，就像Android平台上的connectbot应用程序一样。到目前为止，我的代码是：setCommand()

package com.example.ssh;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Properties;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

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

public class ExampleSSH extends Activity {
    /** Called when the activity is first created. */
    EditText command;
    TextView result;
    Session session;
    ByteArrayOutputStream baos;
    ByteArrayInputStream bais;
    Channel channel;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        bais = new ByteArrayInputStream(new byte[1000]);
        command = (EditText) findViewById(R.id.editText1);
        result  = (TextView) findViewById(R.id.terminal);
    }

    public void onSSH(View v){
        String username = "xxxyyyzzz";
        String password = "aaabbbccc";
        String host     = "192.168.1.1"; // sample ip address
        if(command.getText().toString() != ""){
            JSch jsch = new JSch();
            try {
                session = jsch.getSession(username, host, 22);
                session.setPassword(password);

                Properties properties = new Properties();
                properties.put("StrictHostKeyChecking", "no");
                session.setConfig(properties);
                session.connect(30000);

                channel = session.openChannel("shell");
                channel.setInputStream(bais);
                channel.setOutputStream(baos);
                channel.connect();

            } catch (JSchException e) {
                // TODO Auto-generated catch block
                Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
            }
        }
        else{
            Toast.makeText(this, "Command cannot be empty !", Toast.LENGTH_LONG).show();
        }
    }

    public void onCommand(View v){
        try {
            bais.read(command.getText().toString().getBytes());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        baos = new ByteArrayOutputStream();
        channel.setOutputStream(baos);
        result.setText(baos.toString());

    }
}

代码似乎连接到服务器，但我认为输入和输出数组缓冲区存在一些问题，因为根本没有输出。有人可以指导我如何正确处理服务器之间的输入和输出以获得所需的输出吗？