Exported the JTable to excel but to customize the excel file

Question

Hi,
I have exported the JTable to excel through CSV file. But I want to customize the excel file, by setting border, color and cell styles. How to implement this? Can you please help me out?
Thanks,
public class CalculateUsers extends JPanel implements     ActionListener,     TableModelListener {
     JFrame frame;
     JTable table;
     public CalculateUsers(JPanel mainPanel) {
                rows = new Vector();
          columns = new Vector();
          String[] columnNames = {"BP","users","Avg","time"};
          addColumns(columnNames);
          tabModel = new DefaultTableModel();
          tabModel.setDataVector(rows, columns);
          table = new JTable(tabModel);
          table.getModel().addTableModelListener(this);
          lblMessage = new JLabel("");
             label1 = new JLabel("Textbox 1");
                label2 = new JLabel("Textbox 2");
                text1 = new JTextField(5);
          text2 = new JTextField(5);
          buttonPanel = new JPanel();
                    cmdAdd = new JButton("add");
                    cmdCalculate = new JButton("Calculate");
          cmdExportToExcel = new JButton("ExportToExcel");
                buttonPanel.add(label1);
          buttonPanel.add(text1);
          buttonPanel.add(label2);
          buttonPanel.add(text2);
          buttonPanel.add(cmdCalculate);
          buttonPanel.add(cmdExportToExcel);
          buttonPanel.add(cmdAdd);
     public void addRow() { // Add Row
          Vector r = new Vector();
          r = createBlankElement();
          rows.addElement(r);
                table.addNotify();
     public Vector createBlankElement() {
          Vector t = new Vector();
          t.addElement((String) " ");
          t.addElement((String) " ");
          t.addElement((String) " ");
          t.addElement((String) " ");
          t.addElement((String) " ");
          t.addElement((String) " ");
          t.addElement((String) " ");
             return t;
     public void calculate() throws Exception {
            int i = table.getRowCount();
            int firstCellVal, secondCellVal, thirdCellVal, fourthCellVal, fifthCell, sixthCell, sevenCell, eightCell,jtext1,jtext2;
           try{ 
                 tabModel.addColumn("Time taken");
             tabModel.addColumn("Pse");
             tabModel.addColumn("Users %");
             tabModel.setColumnCount(7);
                jtext1 = Integer.parseInt(text1.getText().toString().trim());
                jtext2 = Integer.parseInt(text2.getText().toString().trim());
              for (i = 0; i < table.getRowCount(); i++) {
                    String cell1 = table.getValueAt(i, 0).toString();
                    String cell2 = table.getValueAt(i, 1).toString();
                    String cell3 = table.getValueAt(i, 2).toString();
                    String cell4 = table.getValueAt(i, 3).toString();
                    sixthCell = secondCellVal * thirdCellVal * fourthCellVal;
                    sevenCell = ((jtext1 - (fourthCellVal * thirdCellVal))/(fourthCellVal - 1));
                    eightCell = (secondCellVal * 100)/jtext2;
                    table.setValueAt(result2, i, 4);
                    table.setValueAt(result3, i, 5);
                    table.setValueAt(result4, i, 6);
            } catch(Exception ae) {
                    ae.printStackTrace();
     public void actionPerformed(ActionEvent source) throws ArithmeticException { // ActionList
          if (source.getSource() == (JButton) cmdAdd) {
                    addRow();
          if (source.getSource() == (JButton) cmdCalculate) {
                      calculate();
          if (source.getSource() == (JButton) cmdExportToExcel) {
                     exportToExcel();
      private void exportToExcel() throws Exception{
               exportTable();
     *public void exportTable() { // export Table*
*          try {*
*               System.out.println("Exporting Table ");*
*               String filename = "ScenarioAutomation" + System.currentTimeMillis()+ ".CSV";*
*               File file = new File(filename);*
*               String data;*
*               String columnNames[] = null;*
*               columnNames = new String[table.getColumnCount()];*
*               if (file != null) {*
                            *try {*
*                    BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file, true));*
*                    PrintWriter fileWriter = new PrintWriter(bufferedWriter);*
*                    System.out.println("Column Headers ");*
*                    firstRowInExcel(fileWriter);*
*                    for (int j = 0; j < columnNames.length; j = j + 1) {*
*                        columnNames[j] = table.getColumnModel().getColumn(j).getHeaderValue().toString();*
*                        data = columnNames[j];*
*                        System.out.println("data " + data);*
*                        fileWriter.print(data + ",");*
                               *     System.out.println("Done.... ");*
                               *     fileWriter.println("");*
                               *     System.out.println("Exporting Data ");*
*                    for (int k = 0; k < table.getRowCount(); ++k) {*
                                    *for (int l = 0; l < table.getColumnCount(); ++l) {*
*                         data = table.getValueAt(k, l).toString();*
*                         fileWriter.print(data + ",");*
                                    *fileWriter.println("");*
*                    fileWriter.close();*
*                    System.out.println("Done.... ");*
*                    System.out.println("File Name " + filename);*
*                    open(file);*
*                    } catch (Exception e) {*
                                    *JOptionPane.showMessageDialog(null, "Error " + e);*
*          } catch (Exception E) {*
*               System.out.println("Error While Exporting Table " + E);*
*     private void firstRowInExcel(PrintWriter fileWriter) {*
                *fileWriter.println("");*
*          String jtext1label = ("Textbox 1");*
*          fileWriter.print(jtext1label);*
*          fileWriter.print(",");*
*          String jtext1Value = text1.getText();*
*          fileWriter.print(jtext1Value);*
*          fileWriter.print(",");*
*          fileWriter.print(" ");*
      *private void open(File f) {*
       *     String[] commands = {*
*          "rundll32",*
*          "url.dll,FileProtocolHandler",*
*          f.getAbsolutePath()*
*          try {*
                    *System.out.println("****OPEN file ****");*
                    *Runtime.getRuntime().exec(commands);*
*          } catch (IOException e) {*
                    *e.printStackTrace();*
*}*

Answer 1

for this purpose you need to took help of the third party APIs.
try POI from Apache
http://poi.apache.org/hssf/index.html
this is easy and efficent. and Free also.
one more i found is
http://es.actuate.com/xlsjbook/apibasics.html (Not sure about this one.)
good luck go ahead