Why are you rendering a JSP as an excel file?? I don't know how you are actually doing it, but once I needed to create excel files and I created then using
Apache POI library for that. Since it is not clear to me how you are rendering your JSP as an excel file, I wonder how you have a number like 00010345 in
java. If you store that value in a numeric type, it will automatically remove the leading zeros. So if you have that value as a
String in java, maybe
you should render it as a string in your excel file...