public static boolean execshell(String command, String user, String passwd, String host) throws JSchException, IOException {

        connect(user, passwd, host);

        BufferedReader reader = null;

        boolean flag = true;

        Channel channel = null;

        String charset ="UTF-8";

        try {

            //执行linux命令

            channel = session.openChannel("exec");

            ((ChannelExec) channel).setCommand(command);

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

            channel.connect();

            InputStream in = channel.getInputStream();

            reader = new BufferedReader(new InputStreamReader(in,

            Charset.forName(charset)));

            String buf = null;

            while ((buf = reader.readLine()) != null) {

            log.info(buf);

            }

             }catch (Exception e) {

                 e.printStackTrace();

             }finally {

                 reader.close();

                 channel.disconnect();

                 session.disconnect();

        }

        return flag;

    }