远程采集服务器指标信息（一） 远程通过SSH执行命令

远程采集服务器信息，比如说磁盘信息、内存信息。

现介绍java通过SSH执行命令采集服务器信息，比如说执行df、ls、top。

/**
 *
 * SSH远程执行shell类
 */
public class SSHSession implements IRemoteSession {

    /** SSH连接 */
    private Connection conn;

    private NodeInfoVO nodeInfoVO;

    private InputStream stdOut = null;

    private String charset = Charset.defaultCharset().toString();

    private static final int TIME_OUT = 1000 * 5 * 60;

    private static final Logger LOGGER = Logger.getLogger(SSHSession.class);

    /**
     * 构造函数
     *
     * @param nodeInfoVO
     */
    public SSHSession(NodeInfoVO nodeInfoVO) {
        this.nodeInfoVO = nodeInfoVO;
    }

    /**
     * 登录
     *
     * @return
     * @throws IOException
     */
    private boolean login() throws IOException {
        conn = new Connection(nodeInfoVO.getServerIp());
        conn.connect();
        return conn.authenticateWithPassword(nodeInfoVO.getServerUserName(), nodeInfoVO.getServerPassword());
    }

    /**
     * 执行脚本
     *
     * @param cmds
     * @return
     * @throws Exception
     */
    public String execCommand(String cmds) {

        String outStr = "";
        try {
            if (login()) {
                // Open a new {@link Session} on this connection
                Session session = conn.openSession();
                // Execute a command on the remote machine.
                session.execCommand(cmds);

                stdOut = new StreamGobbler(session.getStdout());
                outStr = processStream(stdOut, charset);

                session.waitForCondition(ChannelCondition.EXIT_STATUS, TIME_OUT);

            } else {
                LOGGER.error("登录远程机器失败"); // 自定义异常类 实现略
            }
        } catch (Exception e) {
            return outStr;
        } finally {
            close();
        }
        return outStr;
    }

    /**
     * @param in
     * @param charset
     * @return
     * @throws IOException
     * @throws UnsupportedEncodingException
     */
    private String processStream(InputStream in, String charset) throws Exception {
        byte[] buf = new byte[1024];
        StringBuilder sb = new StringBuilder();
        while (in.read(buf) != -1) {
            sb.append(new String(buf, charset));
        }
        return sb.toString();
    }

     public static void main(String args[]) throws Exception {
	     SSHSession exe = new SSHSession(new ServerBean("10.10.5.219", 22, "root", "tt"));
	     System.out.println(exe.execCommand("ls "));
     }

    /**
     * @return 获取 serverBean属性值
     */
    public NodeInfoVO getNodeInfoVO() {
        return nodeInfoVO;
    }

    /**
     *
     * @see com.comtop.numen.monitor.collection.appservice.device.remote.IRemoteSession#close()
     */
    @Override
    public void close() {
        if (conn != null) {
            conn.close();
        }
        IOUtils.closeQuietly(stdOut);
    }