JAVA & EXCEL using the POI API

Question

Hi,
I presently have a stand alone application that I need to redesign for a future use of excel.
I created a spreadsheet with the following cell value:
B5 = 1st value
B6 = second value
B9 = final value
B11 is the total : SUM(B5:B9)
My code is:
try {
// Connect to the Excell workbook
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream("testjava.xls"));
HSSFWorkBook wb = new HSSFWorkbook(fs);
// Choose the sheet object
HSSFSheet sheet = wb.getSheetAt(0); // or use .getSheet("test");
// Create the row object
HSSFRow rowMonday = sheet.getRow(4);
HSSFRow rowTuesday = sheet.getRow(5);
HSSFRow rowWednesday = sheet.getRow(6);
HSSFRow rowThursday = sheet.getRow(7);
HSSFRow rowFriday = sheet.getRow(8);
HSSFRow rowTotal = sheet.getRow(10);
// Get the week value
A5 = rowMonday.getCell((short)0);
B5 = rowMonday.getCell((short)1);
A6 = rowTuesday.getCell((short)0);
B6 = rowTuesday.getCell((short)1);
A7 = rowWednesday.getCell((short)0);
B7 = rowWednesday.getCell((short)1);
A8 = rowThursday.getCell((short)0);
B8 = rowThursday.getCell((short)1);
A9 = rowFriday.getCell((short)0);
B9 = rowFriday.getCell((short)1);
// Get the total value
A11 = rowTotal.getCell((short)0);
B11 = rowTotal.getCell((short)1);
} catch ( IOException ex ) {
ex.printStackTrace();
System.out.println(ex);
Here is my get method:
public double getCellB11()
this.dblTotal = this.B11.getNumericCellValue();
return this.dblTotal;
My application is a simple application with 7 JLabels and 7 JTextField and a getValue and a calculate JButton.
the getValue button get the right value, the total is wrong it keep the value at the first run time.
when I use the calculate button, the spreadsheet is updated with the new value, the total is right in the spreadsheet. But in my application the total still the same value at the first run time. It seems like if the value does not refresh itself.
Here is the code fof the get and calculate methode in my application:
if (object == butGetValue) {
txtName.setText(ToExcel.getCellB3());
txtMonday.setText(String.valueOf(ToExcel.getCellB5()));
txtTuesday.setText(String.valueOf(ToExcel.getCellB6()));
txtWednesday.setText(String.valueOf(ToExcel.getCellB7()));
txtThursday.setText(String.valueOf(ToExcel.getCellB8()));
txtFriday.setText(String.valueOf(ToExcel.getCellB9()));
txtTotal.setText(String.valueOf(ToExcel.getCellB11()));
if (object == butCalculate) {
ToExcel.setCellB3(txtName.getText());
ToExcel.setCellB5(Double.parseDouble(txtMonday.getText()));
ToExcel.setCellB6(Double.parseDouble(txtTuesday.getText()));
ToExcel.setCellB7(Double.parseDouble(txtWednesday.getText()));
ToExcel.setCellB8(Double.parseDouble(txtThursday.getText()));
ToExcel.setCellB9(Double.parseDouble(txtFriday.getText()));
ToExcel.writeNewValue();
txtTotal.setText(String.valueOf(ToExcell.getCellB11()));
Is there anyone who can help me with this?
Any help would be appreciate.

Answer 1

That's native OS problem. Once excel opened a file(even for reading) you can't write to it using other program like your servlet. So close the file before writing, or simply write to different file name.