How to save data to excel with a 2.1 work sheet format without changing it?

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.table.*;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;

public class JTableToExcel{
JTable table;
JButton button;
public static void main(String[] args) {
new JTableToExcel();
}
public JTableToExcel(){
JFrame frame = new JFrame("Getting Cell Values in JTable");
JPanel panel = new JPanel();
String data[][] = {{"Angelina","Mumbai"},{"Martina","Delhi"}};

String col[] = {"Name","Address"};
DefaultTableModel model = new DefaultTableModel(data, col);
table = new JTable(model);
JScrollPane pane = new JScrollPane(table);
button=new JButton("Submit");
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("Excel Sheet");
int index=0;
int count=table.getRowCount();

try{
for(int i=0;i<count;i++){
Object obj1 = GetData(table, i, 0);
Object obj2 = GetData(table, i, 1);
String value1=obj1.toString();
String value2=obj2.toString();
HSSFRow row = sheet.createRow((short)index);
row.createCell((short) 0).setCellValue(value1);
row.createCell((short) 1).setCellValue(value2);
index++;
}
FileOutputStream fileOut = new FileOutputStream("c:\\Hello.xls");
wb.write(fileOut);
fileOut.close();
Runtime rt = Runtime.getRuntime();
rt.exec("cmd.exe /C start C:\\Hello.xls");
}
catch(Exception e){}
}
});
panel.add(pane);
panel.add(button);
frame.add(panel);
frame.setSize(650,350);
frame.setUndecorated(true);
frame.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public Object GetData(JTable table, int row_index, int col_index){
return table.getModel().getValueAt(row_index, col_index);
}
}