使用JSCH库通过java代码连接sshd服务

package cn.com.ultrapower.utils;

import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

public class JSCHUtilsTest {
   public static void main(String[] args) throws JSchException {
       setJschLog();
       String username = "用户名";
       String host = "ip地址"; 
       int port = 22;
       JSch jsch = new JSch();
       Session session = jsch.getSession(username, host, port);
       
       String userpwd = "密码";
       session.setPassword(userpwd);
       session.setConfig("StrictHostKeyChecking", "no");
       //http://epaul.github.io/jsch-documentation/javadoc/
       session.setConfig("PreferredAuthentications", "password");//password,publickey,keyboard-interactive
       //不设置StrictHostKeyChecking=no,报错：UnknownHostKey: 192.168.10.209. RSA key fingerprint is 55:7e:b7:cb:fe:4b:78:f5:25:a5:73:29:a8:e0:63:1f
       session.setTimeout(5* 1000);
       session.connect(5* 1000);
       
       /**
       ChannelShell channel = (ChannelShell) session.openChannel("shell");
       channel.connect(5 * 1000);
       if (session.isConnected()) {
           System.out.println(session.getHost());
       }
       channel.disconnect();
       session.disconnect();
       */
       ChannelExec  channel = (ChannelExec) session.openChannel("exec");
       //默认情况下，JSch 中的“exec”通道（正确）不会为会话分配伪终端 （PTY）。因此，（可能）提供了一组不同的启动脚本。
       //最好是不要设置强制分配伪终端
       //((ChannelExec)channel).setPty(true);
       
       channel.setCommand("uname -a && date && uptime && echo $0 && w && echo \"umask=\"$(bash --login -c 'umask')");
       
//       exec.setCommand("ifconfig"); //擦的，不知道啥原因ifconfig和ip add show执行结果都是空
       channel.connect();
       
       if(session.isConnected()) {
    	   try {
			 InputStream inputStream = channel.getInputStream();
			 String result = IOUtils.toString(inputStream);
			 System.out.println("result : \n"+result);
		   } catch (IOException e) {
			 // TODO Auto-generated catch block
			 e.printStackTrace();
		   } finally {
			   channel.disconnect();
			   session.disconnect();
		   }
       }
       
   }
   private static void setJschLog () {
	   com.jcraft.jsch.Logger JSCH_DEBUG = new com.jcraft.jsch.Logger() {
	    public boolean isEnabled(int level) { return true; }
	    public void log(int level, String message) { System.out.println(message); }
	   };
	   JSch.setLogger(JSCH_DEBUG);
  }
}