如何使用java在ubuntu中檢測工作站/系統屏幕鎖定？

Question

我試圖記下在Ubuntu操作系統中工作的每個員工的工作站/系統屏幕鎖。我需要將這些記錄存儲在數據庫中。使用JAVA。我搜索了全部，並且想到了UBUNTU的想法。但知道如何在Windows操作系統中做同樣的事情。

Answer 1

從here：

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

使用Runtime類來執行該命令並回讀的結果。

編輯：使用grep -q

下面的例子如何使用它：

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()); 
    } 

} 

編輯：添加perl腳本看DBUS信號。來源： 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     print "*** Screensaver is no longer active ***\n"; 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

有嘗試看看這裏，（類似一式兩份），Detect workstation/System Screen Lock using Python(ubuntu)）

GNOME Screensaver FAQ這應該是一個真棒參考你起牀的速度。我想你正在使用GNOME。