假设您在Windows上部署Java应用程序，可以使用此WIN32API函数：

Assuming you deploy your Java Applications on Windows, you can use this WIN32API functions:

// turn off monitor
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) 2); 

// turn on monitor
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) -1);    

然后你写一点 C-JNI包装器用于调用上述 SendMessage 的函数，并使用小包装器从Java关闭监视器。

Then you write a little C-JNI wrapper to functions that call the mentioned SendMessage and use the little wrapper to turn off the monitor from Java.