如何使用 java 在 ubuntu 中检测工作站/系统屏幕锁定？

Question

我正在尝试记下在 ubuntu 操作系统中工作的每个员工的工作站/系统屏幕锁定。我需要将这些记录存储在数据库中。使用 JAVA。我已经到处搜索并想到了 UBUNTU；但是知道如何在 Windows 操作系统中做同样的事情。

Answer 1

来自here：

gnome-screensaver-command -q | grep "is active"

使用Runtime 类执行该命令并读回结果。

编辑：使用grep -q

这里是一个如何使用它的例子：

public class ScreenSaver {

  /*
   * Pipes are a shell feature, so you have to open a shell first.
   * 
   * You could use process.getInputStream() to read the output and parse it.
   * 
   * For productive use i would prefer using the Inputstream.
   */

  private static final String COMMAND = "gnome-screensaver-command -q |  grep -q 'is active'";

  private static final String[] OPEN_SHELL = { "/bin/sh", "-c", COMMAND };

  private static final int EXPECTED_EXIT_CODE = 0;


  public static boolean isScreenSaverActive() {
    final Runtime runtime = Runtime.getRuntime();
    Process process = null;
    try {
      /*
       * open a shell and execute the command in that shell
       */
      process = runtime.exec(OPEN_SHELL);
      /*
       * wait for the command to finish
       */
      return process.waitFor() == EXPECTED_EXIT_CODE;
    } catch(final IOException e) {
      e.printStackTrace();
    } catch(final InterruptedException e) {
      e.printStackTrace();
    }
    return false;
  }


  public static void main(final String[] args) {
    System.out.println("Screensaver is active: " + isScreenSaverActive());
  }

}

编辑：添加了观察 dbus 信号的 perl 脚本。来源： Gnome Screensaver FAQ

#!/usr/bin/perl

my $cmd = "dbus-monitor --session \"type='signal',interface='org.gnome.ScreenSaver',member='ActiveChanged'\"";

open (IN, "$cmd |");

while (<IN>) {
    if (m/^\s+boolean true/) {
        print "*** Screensaver is active ***\n";
    } elsif (m/^\s+boolean false/) {
        print "*** Screensaver is no longer active ***\n";
    }
}

Answer 2

试试看这里，（类似重复），Detect workstation/System Screen Lock using Python(ubuntu))

GNOME Screensaver FAQ 这应该是一个很棒的参考资料，可以帮助您快速上手。我想你正在使用 GNOME。