java 使用jsch 远程链接linux执行命令

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

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

public class ShellUtils {
private static JSch jsch;
private static Session session;

/**
* 连接到指定的IP
*
* @throws JSchException
*/
public static void connect(String user, String passwd, String host) throws JSchException {
jsch = new JSch();
session = jsch.getSession(user, host, 22);
session.setPassword(passwd);

java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);

session.connect();
}

/**
* 执行相关的命令
* @throws JSchException
*/
public static void execCmd(String command, String user, String passwd, String host) throws JSchException {
connect(user, passwd, host);

BufferedReader reader = null;
Channel channel = null;

try {
while (command != null) {
channel = session.openChannel("exec");
((ChannelExec) channel).setCommand(command);

channel.setInputStream(null);
((ChannelExec) channel).setErrStream(System.err);

channel.connect();
InputStream in = channel.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
String buf = null;
while ((buf = reader.readLine()) != null) {
System.out.println(buf);
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (JSchException e) {
e.printStackTrace();
} finally {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
channel.disconnect();
session.disconnect();
}
}

}