Get system health in Java

On Windows, you can execute a command net stats srv

, and on Unix, you can execute a command uptime

. Each output must be analyzed to obtain uptime. This method automatically executes the required command, detecting the user's operating system.

Note that none of the operations return millisecond precision uptime.

public static long getSystemUptime() throws Exception {
    long uptime = -1;
    String os = System.getProperty("os.name").toLowerCase();
    if (os.contains("win")) {
        Process uptimeProc = Runtime.getRuntime().exec("net stats srv");
        BufferedReader in = new BufferedReader(new InputStreamReader(uptimeProc.getInputStream()));
        String line;
        while ((line = in.readLine()) != null) {
            if (line.startsWith("Statistics since")) {
                SimpleDateFormat format = new SimpleDateFormat("'Statistics since' MM/dd/yyyy hh:mm:ss a");
                Date boottime = format.parse(line);
                uptime = System.currentTimeMillis() - boottime.getTime();
                break;
            }
        }
    } else if (os.contains("mac") || os.contains("nix") || os.contains("nux") || os.contains("aix")) {
        Process uptimeProc = Runtime.getRuntime().exec("uptime");
        BufferedReader in = new BufferedReader(new InputStreamReader(uptimeProc.getInputStream()));
        String line = in.readLine();
        if (line != null) {
            Pattern parse = Pattern.compile("((\\d+) days,)? (\\d+):(\\d+)");
            Matcher matcher = parse.matcher(line);
            if (matcher.find()) {
                String _days = matcher.group(2);
                String _hours = matcher.group(3);
                String _minutes = matcher.group(4);
                int days = _days != null ? Integer.parseInt(_days) : 0;
                int hours = _hours != null ? Integer.parseInt(_hours) : 0;
                int minutes = _minutes != null ? Integer.parseInt(_minutes) : 0;
                uptime = (minutes * 60000) + (hours * 60000 * 60) + (days * 6000 * 60 * 24);
            }
        }
    }
    return uptime;
}

      

        
        
        
      

    

For windows, you can get uptime

up to millisecond precision by askingwindows WMI

To run the below code you need to download the Jawin library and add jawin.dll

to your eclipse project root

 public static void main(String[] args) throws COMException {
    String computerName = "";
    String userName = "";
    String password = "";
    String namespace = "root/cimv2";

    String queryProcessor = "SELECT * FROM Win32_OperatingSystem";

    DispatchPtr dispatcher = null;

    try {

        ISWbemLocator locator = new ISWbemLocator(
                "WbemScripting.SWbemLocator");
        ISWbemServices wbemServices = locator.ConnectServer(computerName,
                namespace, userName, password, "", "", 0, dispatcher);
        ISWbemObjectSet wbemObjectSet = wbemServices.ExecQuery(
                queryProcessor, "WQL", 0, null);
        DispatchPtr[] results = new DispatchPtr[wbemObjectSet.getCount()];
        IUnknown unknown = wbemObjectSet.get_NewEnum();
        IEnumVariant enumVariant = (IEnumVariant) unknown
                .queryInterface(IEnumVariant.class);

        enumVariant.Next(wbemObjectSet.getCount(), results);

        for (int i = 0; i < results.length; i++) {
            ISWbemObject wbemObject = (ISWbemObject) results[i]
                    .queryInterface(ISWbemObject.class);

            System.out.println("Uptime: "
                    + wbemObject.get("LastBootUpTime"));
        }
    } catch (COMException e) {
        e.printStackTrace();
    }