Session sess = null;
        StringBuffer normal = new StringBuffer();
        StringBuffer error = new StringBuffer();
        try {
            if (!isAlive()) connect();
            sess = this.openSession(conn);
            sess.execCommand(cmd);// 执行命令

            InputStream out = new StreamGobbler(sess.getStdout());// 正常输出
            InputStream err = new StreamGobbler(sess.getStderr());// 异常输出
            BufferedReader outStr = new BufferedReader(new InputStreamReader(out));
            BufferedReader errStr = new BufferedReader(new InputStreamReader(err));
            String line = "";
            while ((line = outStr.readLine()) != null) {
                normal.append(line + "\n");
            }
            while ((line = errStr.readLine()) != null) {
                logger.error(line);
                error.append(line + "\n");
            }

        } catch (Exception e) {
            logger.error(e.toString(), e);
        } finally {
            this.closeSession(sess);
        }