CSV to TableModel

import java.io.*;

import java.util.*;

import javax.swing.*;
import javax.swing.table.*;


public class Csv2TableModel {
    /**
     * Rudimentary quick and dirty demo code
     *
     * @param args (Not used)
     */
    public static void main(String[] args) {
        try {
            // Read a csv file called 'data.txt' and save it to a more
            // correctly named 'data.csv'
            String datafile = "data.txt";
            FileReader fin = new FileReader(datafile);
            DefaultTableModel m = createTableModel(fin, null);
            JFrame f = new JFrame();
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.getContentPane().add(new JScrollPane(new JTable(m)));
            f.setSize(200, 300);
            f.setVisible(true);

            FileWriter out = new FileWriter("data.csv");
            defaultTableModelToStream(m, out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     *
     * @param dtm The DefaultTableModel to save to stream
     * @param out The stream to which to save
     *
     */
    public static void defaultTableModelToStream(DefaultTableModel dtm,
        Writer out) throws IOException {
        final String LINE_SEP = System.getProperty("line.separator");
        int numCols = dtm.getColumnCount();
        int numRows = dtm.getRowCount();

        // Write headers
        String sep = "";

        for (int i = 0; i < numCols; i++) {
            out.write(sep);
            out.write(dtm.getColumnName(i));
            sep = ",";
        }

        out.write(LINE_SEP);

        for (int r = 0; r < numRows; r++) {
            sep = "";

            for (int c = 0; c < numCols; c++) {
                out.write(sep);
                out.write(dtm.getValueAt(r, c).toString());
                sep = ",";
            }

            out.write(LINE_SEP);
        }
    }

    /**
     *
     *
     * @param in A CSV input stream to parse
     * @param headers A Vector containing the column headers. If this is null, it's assumed
     * that the first row contains column headers
     *
     * @return A DefaultTableModel containing the CSV values as type String
     */
    public static DefaultTableModel createTableModel(Reader in,
        Vector<Object> headers) {
        DefaultTableModel model = null;
        Scanner s = null;

        try {
            Vector<Vector<Object>> rows = new Vector<Vector<Object>>();
            s = new Scanner(in);

            while (s.hasNextLine()) {
                rows.add(new Vector<Object>(Arrays.asList(s.nextLine()
                                                           .split("\\s*,\\s*",
                                -1))));
            }

            if (headers == null) {
                headers = rows.remove(0);
                model = new DefaultTableModel(rows, headers);
            } else {
                model = new DefaultTableModel(rows, headers);
            }

            return model;
        } finally {
            s.close();
        }
    }
}