Place one-inch margins on the page : Print « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. Print

If you need centimeters instead of inches, multiply each inch value by 2.54 to get the number of centimeters.

import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.printing.PrintDialog;
import org.eclipse.swt.printing.Printer;
import org.eclipse.swt.printing.PrinterData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class MainClass {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);

    PrintDialog dlg = new PrintDialog(shell);

    dlg.setScope(PrinterData.SELECTION);

    PrinterData printerData = dlg.open();
    if (printerData != null) {
      Printer printer = new Printer(printerData);
      System.out.println(printer.getClientArea());

      Point dpi = printer.getDPI(); // Get the DPI
      Rectangle rect = printer.getClientArea(); // Get the printable area
      Rectangle trim = printer.computeTrim(0, 0, 0, 0); // Get the whole page
      int left = trim.x + dpi.x; // Set left margin one inch from left side of paper
      int top = trim.y + dpi.y; // Set top margin
      int right = (rect.width + trim.x + trim.width) - dpi.x; // 1st three
                                                              // values give
      // you the right side of the page
      int bottom = (rect.height + trim.y + trim.height) - dpi.y; // Set bottom
                                                                  // margin

      // use left, top, right, and bottom as the boundaries that govern where
      // you draw on the page.

      printer.dispose();
    }

    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}