It does not appear this is supported in Swing in Java 6.
Currently, the simplest way I can find to open this dialog is through SWT, not Swing. SWT's FileDialog (javadoc) brings up this dialog. The following is a modification of SWT's FileDialog snippet to use an open instead of save dialog. I know this isn't exactly what you're looking for, but you could isolate this to a utility class and add swt.jar to your classpath for this functionality.
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
public class SWTFileOpenSnippet {
public static void main (String [] args) {
Display display = new Display ();
Shell shell = new Shell (display);
// Don't show the shell.
//shell.open ();
FileDialog dialog = new FileDialog (shell, SWT.OPEN | SWT.MULTI);
String [] filterNames = new String [] {"All Files (*)"};
String [] filterExtensions = new String [] {"*"};
String filterPath = "c:";
dialog.setFilterNames (filterNames);
dialog.setFilterExtensions (filterExtensions);
dialog.setFilterPath (filterPath);
dialog.open();
System.out.println ("Selected files: ");
String[] selectedFileNames = dialog.getFileNames();
for(String fileName : selectedFileNames) {
System.out.println(" " + fileName);
}
shell.close();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
}
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