JFileChooser : User selected directory & programmatically created file name : How?

[D R Wilkinson]

I am trying to let the user select the directory they want to save a plain text file in and have the program determine the name of the file. The attempt I have made isn't working and the more I read the API, the more confused I am getting... can anyone help me?

public void export() {
        
        File plainTextFile = null;
        
        bookTreeModel = (BookTreeModel) bookTree.getModel();
        DefaultMutableTreeNode bookNode = (DefaultMutableTreeNode) bookTreeModel.getRoot();
        book = (Book) bookNode.getUserObject();
        
        try {
            
            // TODO : 060506 : Implement progress indicator.
            
            JFileChooser chooser = new JFileChooser();
            chooser.setFileSelectionMode( JFileChooser.DIRECTORIES_ONLY );
            chooser.setDialogType( JFileChooser.SAVE_DIALOG );
            
            int returnValue = chooser.showSaveDialog( bookTree.getRootPane() );
            
            if ( returnValue == JFileChooser.APPROVE_OPTION ) {
                
                // TODO : 060506 : Bug : Sort out directory filename stuff.
                
                plainTextFile = chooser.getSelectedFile(); // Is the chosen directory?
                
                String fileName = new String( book.getTitle() + ".txt" ); // Is the name for the file.
 
                // Not sure how to use the two together!
 
                FileWriter writer = new FileWriter( plainTextFile );
 
                // TODO : 060506 : Implement full book export.
 
                writer.write( book.getTitle() );
                writer.write( '\n' );
                writer.write( book.getAuthor() );
                writer.write( '\n' );
                if ( exportSummary ) {
 
                    writer.write( book.getSummary() );
                    writer.write( '\n' );
 
                }
                if ( exportDescription ) {
 
                    writer.write( book.getDescription() );
                    writer.write( '\n' );
 
                }
 
                writer.close();
                
            } else {
                
                // TODO : 060506 : Implement export cancelled messaging.
                
                System.out.println( "Export Cancelled By User." );
                
            }
            
        } catch ( IOException e ) {
            
            e.printStackTrace();
            
        }
        
        System.out.println("Book exported successfully.");
        
    }

Thank you
[ May 06, 2006: Message edited by: D R Wilkinson ]

[Michael Dunn]

seems to work OK in this

    
import java.awt.*;
import javax.swing.*;
import java.io.*;
class Testing extends JFrame
{
  String fileName = "/HelloWorld.txt";
  public Testing()
  {
    setLocation(200,300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    JFileChooser  fc = new JFileChooser(".");
    fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
    fc.setSelectedFile(new File("TestFC.txt"));
    int returnVal = fc.showSaveDialog(this);
    if (returnVal == JFileChooser.APPROVE_OPTION)
    {
      try
      {
        PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(new File(fc.getSelectedFile()+fileName))));
        out.println("hello World");
        out.close();
      }
      catch(Exception e){e.printStackTrace();}
    }
    else
    {
        System.out.println("cancelled");
    }
  }
  public static void main(String[] args){new Testing().setVisible(true);}
}

[D R Wilkinson]

Thank you,

The problem lay with the char literal '\' not being added correctly.

Solved it by using "\\"

Not sure if this causes a cross platform problem?

Darren