java- poi

hi all,
can anybody tell how to open/save/cancel a excel file.
i want a pop up in which the pop up should contain open/save/cancel a excel sheet.Am using POI and getOutputStream.
please help.
thanks
Shabarish

Are you setting the content type and Content-Disposition headers? Something like

POIFSFileSystem templateFs = new POIFSFileSystem(new FileInputStream("C:\\template.xls"));
HSSFWorkbook wb = new HSSFWorkbook(templateFs,true);
/*POIFSFileSystem outputfs = new POIFSFileSystem(new FileInputStream("C:workbook.xls"));
HSSFWorkbook wb_output = new HSSFWorkbook(outputfs,true);*/
HSSFSheet sheet_output = wb.getSheetAt(0);
for (Iterator rit = sheet_output.rowIterator(); rit.hasNext(); )
{
HSSFRow rowFor = (HSSFRow)rit.next();
for (Iterator cit = rowFor.cellIterator(); cit.hasNext(); )
{
HSSFCell cellFor = (HSSFCell)cit.next();
for(int i=0;i<key.length;i++)
{
String temp = cellFor.getStringCellValue();
if(temp.equalsIgnoreCase(key[i]))
{
temp=value[i];
cellFor = rowFor.createCell((short)1);
cellFor.setCellValue(temp);
}
}
}
}
String dirName ="C

utput.xls";
FileOutputStream fileOut = new FileOutputStream(dirName);
wb.write(fileOut);
fileOut.close();

Originally posted by Ulf Dittmer:
Are you setting the content type and Content-Disposition headers? Something like
response.setHeader("Content-Disposition", "attachment; filename=\"table.xls\"");

Originally posted by shabarish vai:
POIFSFileSystem templateFs = new POIFSFileSystem(new FileInputStream("C:\\template.xls"));
HSSFWorkbook wb = new HSSFWorkbook(templateFs,true);
/*POIFSFileSystem outputfs = new POIFSFileSystem(new FileInputStream("C:workbook.xls"));
HSSFWorkbook wb_output = new HSSFWorkbook(outputfs,true);*/
HSSFSheet sheet_output = wb.getSheetAt(0);
for (Iterator rit = sheet_output.rowIterator(); rit.hasNext(); )
{
HSSFRow rowFor = (HSSFRow)rit.next();
for (Iterator cit = rowFor.cellIterator(); cit.hasNext(); )
{
HSSFCell cellFor = (HSSFCell)cit.next();
for(int i=0;i<key.length;i++)
{
String temp = cellFor.getStringCellValue();
if(temp.equalsIgnoreCase(key[i]))
{
temp=value[i];
cellFor = rowFor.createCell((short)1);
cellFor.setCellValue(temp);
}
}
}
}
String dirName ="C utput.xls";
FileOutputStream fileOut = new FileOutputStream(dirName);
wb.write(fileOut);
fileOut.close();
openTemplate(dirName,response);

}
/**
* @param dirName
* @param response
* @throws Exception
*/
private void openTemplate(String dirName, HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
File file = new File(dirName);
byte[] bytes = getBytesFromFile(file);
BufferedOutputStream bou = new BufferedOutputStream(response.getOutputStream());
response.setHeader("Content-Disposition","attachment;filename=workbook.xls");
response.setContentType("application/vnd.ms-excel");
bou.write(bytes);

when i generate the pop up the contents wil not be copied properly if i open excel sheet from pop up i'll get error message in excel sheet telling that file is damaged

Originally posted by Ulf Dittmer:
Are you setting the content type and Content-Disposition headers? Something like
response.setHeader("Content-Disposition", "attachment; filename=\"table.xls\"");

If you want to stream the file to the client, you don't need to write it to disk first. You can use POIFSFileSystem.writeFilesystem method to write it to the output stream directly. That would eliminate possible sources of problems (and be faster to begin with).

HI, can you please explain me with few snippets
it wil be helpfull
thanks
Shabarish

Originally posted by Ulf Dittmer:
If you want to stream the file to the client, you don't need to write it to disk first. You can use POIFSFileSystem.writeFilesystem method to write it to the output stream directly. That would eliminate possible sources of problems (and be faster to begin with).

There isn't much to it. It would go something like this:

Also, please be a bit more careful with the CODE and QUOTE buttons. Somehow your posts contain too many of those where they aren't needed. There's also no need to quote the previous post in a response, unless you're referring to some specific part of it (in which case only that part should be quoted).
[ July 03, 2008: Message edited by: Ulf Dittmer ]