Find DPI of each screen device in Java 7 - WinOS

We have a software written in Java 7 (Swing) that needs to dynamically adapt some swing components depending on the screen resolution (DPI, not the screen size) of the monitor they are displayed on.
Toolkit.getDefaultToolkit().getScreenResolution() works fine for the primary monitor, we need the same for the other monitors.
The code must work for Windows OS.