I'm using JFileChooser in a very standard "Save As" situation. A am generating a file, and the user is picking where to save it.
Confusingly, the user can pick number of "not real" folders. In Windows 7 they are: Computer, Network, Libraries, Homegroup. When I invoke chooser.getSelectedFile(); I get a file object, but it is very odd. It makes sense that this would be a strange File object since it doesn't correspond to a file which could actually exist. If I try to use the file, for example calling getCanonicalPath, I get an IOException. But what doesn't make sense, as a programmer, is my lack of information about this File object or its parent.
I would like to configure the JFileChooser so that it doesn't permit the user to make such a selection. Thus far I've found that using this works:
setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
However the user is then picking the directory of the new file but not the name.
Alternately, I would like to at least explain why they can't save in that location. All my attempts to get the name, e.g. "Computer," "Network," or "Libraries" have failed. Using Java 6 on Windows 7, FileSystemView methods like isComputerNode and isFileSystem, which should address this question, don't help.
import java.awt.Component;
import java.io.File;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileSystemView;
public class JChooserTest {
public static void main(String[] args) {
JFileChooser chooser = new JFileChooser();
chooser.setSelectedFile(new File("C:/foo.txt"));
chooser.setDialogTitle("Save As");
chooser.setFileHidingEnabled(true);
chooser.setMultiSelectionEnabled(false);
chooser.setFileSelectionMode(javax.swing.JFileChooser.FILES_AND_DIRECTORIES);
chooser.setDialogType(JFileChooser.SAVE_DIALOG);
Component parentComponent = null; // is not null in the real world
int state=chooser.showDialog(parentComponent, "Save As");
if (state == JFileChooser.CANCEL_OPTION) return;
File dest = chooser.getSelectedFile();
try {
System.out.println("Valid Destination: " + dest.getCanonicalPath());
} catch (IOException ex) { // getCanonicalPath() threw IOException
File parent = dest.getParentFile();
FileSystemView fsv = FileSystemView.getFileSystemView();
//log.error("Error determining the CanonicalPath of " + dest, ex);
System.out.println("dest.getName: " + dest.getName());
System.out.println("parent.getName: " + parent.getName());
System.out.println("getSystemDisplayName of dest: " + fsv.getSystemDisplayName(dest));
System.out.println("getSystemDisplayName of parent: " + fsv.getSystemDisplayName(parent));
System.out.println("getSystemTypeDescription of dest: " + fsv.getSystemTypeDescription(dest));
System.out.println("getSystemTypeDescription of parent: " + fsv.getSystemTypeDescription(parent));
System.out.println("isFileSystem of dest: " + fsv.isFileSystem(dest));
System.out.println("isFileSystem of parent: " + fsv.isFileSystem(parent));
System.out.println("isComputerNode of dest: " + fsv.isComputerNode(dest));
System.out.println("isComputerNode of parent: " + fsv.isComputerNode(parent));
System.out.println("dest" + dest.isDirectory());
System.out.println("parent" + parent.isDirectory());
}
}
}
