Problem in opening csv file in client side

[jothish chokkalingam]

Hai guys,
i want to open a csv file from server to client. csv file is opening correctly but The problem i faced in opening the csv file is that

consider there are two values say name=jothish and age=12
in csv file it will be like jothish in one cell and 12 in next cell....as they are seperated by commas(jothish,12). if i open the file in server it is opening correctly like jothish in open cell and 12 in next cell, but if i open the file in client side i am getting as jothish,12 in one cell so (not recognizing the comma as next cell) please give suggestion in correcting this......
my pice of code to open in client side

FileInputStream fis = new FileInputStream("csvfile");
BufferedInputStream bis = new BufferedInputStream(fis);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int ch;
while ((ch = bis.read()) != -1)
{
 baos.write(ch);
 }
byte[] buffer = baos.toByteArray();
response.setContentType("application/vnd.ms-excel"); response.setContentLength(baos.size());
ServletOutputStream out1 = response.getOutputStream(); baos.writeTo(out1);