File Extention when using JFileChooser

Question

I'm using the JFileChooser and a FileFilter with for extensions of .ses, and I can't get it to append .ses to a file name if the user doesn't do it at the time they are in the File choser.
What I've tried:
JFileChooser fc = new JFileChooser();
fc.setFileFilter(new SessionFileFilter());
int retVal = fc.showSaveDialog(null);
if(retVal == JFileChooser.APPROVE_OPTION){
     f = fc.getSelectedFile();
if(!f.getName().endsWith(".ses")){
               f=new File(f.getName()+".ses");
...SessionFileChooser...
public boolean accept(File f) {
          boolean retval = false;
          int pos = f.getName().indexOf(".");
          if(pos != -1){
               if(f.getName().substring(pos).equals(".ses")){
                    retval = true;
          return retval;
     public String getDescription() {
          return ".ses";
...any help would be appreciated, if you need source that compiles i'll get some worked out...
to clarify the problem, if you go to save this web page and a dialog appears, you don't have to type .htm, but it automatically adds it before saving, this is what i'm trying to achieve.

Answer 1

These two classes should do it. Let me know if there are any problems
You are welcome to use and modify this code, but please don't change the package or take credit for it as your own work
FileExtensionFilter
===============
package tjacobs.ui.fc;
import java.io.File;
import javax.swing.filechooser.FileFilter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
public class FileExtensionFilter extends FileFilter {
    private ArrayList<String> mExtensionList;
    private String mDesc;
    public FileExtensionFilter (String extension) {
        mExtensionList = new ArrayList<String>(1);
        mExtensionList.add(extension);
    public FileExtensionFilter(List<String> extensions) {
        mExtensionList = new ArrayList();
          mExtensionList.addAll(extensions);
    public FileExtensionFilter(String[] extensions) {
        mExtensionList = new ArrayList();
        for (int i =0; i < extensions.length; i++) {
            mExtensionList.add(extensions);
     public void addExtension(String extension) {
          mExtensionList.add(extension);
     public Iterator<String> getExtensions() {
          Iterator<String> i = Collections.unmodifiableList(mExtensionList).iterator();
          return i;
public boolean accept(File file) {
     if (file.isDirectory()) {
          return true;
String name = file.getName();
int idx = name.indexOf(".");
String type = "";
if (idx != -1) {
type = name.substring(idx + 1);
type = type.toLowerCase();
return mExtensionList.contains(type);
public void setDescription(String desc) {
mDesc = desc;
public String getDescription() {
if (mDesc == null) {
mDesc = "";
for (int i = 0; i < mExtensionList.size(); i++) {
mDesc += (i != 0 ? ", " : "") + "." + mExtensionList.get(0).toString();
mDesc+= " files";
return mDesc;
public String getType () {
return mExtensionList.get(0).toString();
public static class HTMLFilter extends FileExtensionFilter {
public HTMLFilter () {
super(new String[] {"html", "htm"});
setDescription("Web Page Files");
public static class RTFFilter extends FileExtensionFilter {
public RTFFilter () {
super("rtf");
setDescription("Rich Text Format Files");
public static class TextFilter extends FileExtensionFilter {
public static final String TYPES[] = new String[] {"txt", "text", "java"};
     public TextFilter () {
super(TYPES);
setDescription("Text Files");
FileChooser
==========
* Created on Jun 22, 2005 by @author Tom Jacobs
package tjacobs.ui.fc;
import java.awt.Component;
import java.io.File;
import java.util.List;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileSystemView;
public class FileChooser extends JFileChooser {
     public FileChooser(FileExtensionFilter filter) {
          super();
          addChoosableFileFilter(filter);
     public FileChooser(String type) {
          this (new FileExtensionFilter(type));
     public FileChooser(List<String> types) {
          this (new FileExtensionFilter(types));
     public FileChooser(String path, FileExtensionFilter filter) {
          super(path);
          addChoosableFileFilter(filter);
          // TODO Auto-generated constructor stub
     public FileChooser(String path, String type) {
          this(path, new FileExtensionFilter(type));
          // TODO Auto-generated constructor stub
     public FileChooser(String path, List<String> types) {
          this(path, new FileExtensionFilter(types));
          // TODO Auto-generated constructor stub
     public FileChooser(File path, FileExtensionFilter filter) {
          super(path);
          addChoosableFileFilter(filter);
     public FileChooser(File path, String type) {
          this(path, new FileExtensionFilter(type));
          // TODO Auto-generated constructor stub
     public FileChooser(File path, List<String> types) {
          this(path, new FileExtensionFilter(types));
          // TODO Auto-generated constructor stub
     public FileChooser(FileSystemView arg0, FileExtensionFilter filter) {
          super(arg0);
          addChoosableFileFilter(filter);
     public FileChooser(FileSystemView arg0, String type) {
          this(arg0, new FileExtensionFilter(type));
          // TODO Auto-generated constructor stub
     public FileChooser(FileSystemView arg0, List<String> types) {
          this(arg0, new FileExtensionFilter(types));
          // TODO Auto-generated constructor stub
     public FileChooser(File path, FileSystemView arg1, FileExtensionFilter filter) {
          super(path, arg1);
          addChoosableFileFilter(filter);
     public FileChooser(File path, FileSystemView arg1, String type) {
          this(path, arg1, new FileExtensionFilter(type));
                    // TODO Auto-generated constructor stub
     public FileChooser(File path, FileSystemView arg1, List<String> types) {
          this(path, arg1, new FileExtensionFilter(types));
          // TODO Auto-generated constructor stub
     public FileChooser(String path, FileSystemView arg1, FileExtensionFilter filter) {
          super(path, arg1);
          addChoosableFileFilter(filter);
          // TODO Auto-generated constructor stub
     public FileChooser(String path, FileSystemView arg1, String type) {
          this(path, arg1, new FileExtensionFilter(type));
          // TODO Auto-generated constructor stub
     public FileChooser(String path, FileSystemView arg1, List<String> types) {
          this(path, arg1, new FileExtensionFilter(types));
          // TODO Auto-generated constructor stub
     public int showSaveDialog(Component c) {
          int ok = super.showSaveDialog(c);
          if (ok == JFileChooser.APPROVE_OPTION) {
               FileFilter filter = getFileFilter();
               if (filter instanceof FileExtensionFilter) {
                    File f = getSelectedFile();
                    if (!filter.accept(f)) {
                         setSelectedFile(new File(f.getAbsolutePath() + "." + ((FileExtensionFilter)filter).getType()));
          return ok;