public class View extends ViewPart {
            public void createPartControl(Composite parent) {

                            Display display = new Display();
                            final Shell shell = new Shell(display);

                            FileDialog dlg = new FileDialog(shell, SWT.OPEN);
                            String fileName = dlg.open();
                            if (fileName != null) {
                                System.out.println(fileName);
            }
    ......
}

public void createPartControl(Composite parent) {

    FileDialog dlg = new FileDialog(parent.getShell(), SWT.OPEN);
    String fileName = dlg.open();
    if (fileName != null) {
        System.out.println(fileName);
    }
}