遠端採集伺服器資訊，比如說磁碟資訊、記憶體資訊。

現介紹java通過SSH執行命令採集伺服器資訊，比如說執行df、ls、top。

/**
 * 
 * SSH遠端執行shell類
 */
public class SSHSession implements IRemoteSession {
    
    /** SSH連線 */
    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);
    
    /**
     * 建構函式
     * 
     * @param nodeInfoVO
     */
    public SSHSession(NodeInfoVO nodeInfoVO) {
        this.nodeInfoVO = nodeInfoVO;
    }
    
    /**
     * 登入
     * 
     * @return
     * @throws IOException
     */
    private boolean login() throws IOException {
        conn = new Connection(nodeInfoVO.getServerIp());
        conn.connect();
        return conn.authenticateWithPassword(nodeInfoVO.getServerUserName(), nodeInfoVO.getServerPassword());
    }
    
    /**
     * 執行指令碼
     * 
     * @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("登入遠端機器失敗"); // 自定義異常類 實現略
            }
        } 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 獲取 serverBean屬性值
     */
    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);
    }