java连接linux操作

package test;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.Properties;

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

public class T {
public static void main(String[] args) throws Exception {
JSch jsch = new JSch(); // 创建JSch对象
String userName = "root";// 用户名
String password = "paic2015";// 密码
String host = "10.20.18.55";// 服务器地址
int port = 22;// 端口号
String cmd = " mkdir aa.txt ";// 要运行的命令
Session session = jsch.getSession(userName, host, port); // 根据用户名，主机ip，端口获取一个Session对象
session.setPassword(password); // 设置密码
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config); // 为Session对象设置properties
int timeout = 60000000;
session.setTimeout(timeout); // 设置timeout时间
session.connect(); // 通过Session建立链接
ChannelExec channelExec = (ChannelExec) session.openChannel("exec");
channelExec.setCommand(cmd);
channelExec.setInputStream(null);
channelExec.setErrStream(System.err);
channelExec.connect();
InputStream in = channelExec.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in, Charset.forName("UTF-8")));
String buf = null;
StringBuffer sb = new StringBuffer();
while ((buf = reader.readLine()) != null) {
sb.append(buf);
System.out.println(buf);// 打印控制台输出
}
reader.close();
channelExec.disconnect();
if (null != session) {
session.disconnect();
}
}
}