How to password protect a zipped Excel file in Java?

Question

I have a question about password protecting an Excel file.

The situation is that, I have a zip file, that has an Excel file in it. I need to write a Java program, to

Answer 1

Without uncompressing, Its impossible to password protect excel which is inside a zip file.

Here is what you can do

• Unzip the content using tips in What is the best way to extract a zip file using java and Compressing and Decompressing Data Using Java APIs
• Password protect extracted excel file using tips in Password Protected Excel File
• Zip the password protected excel file using tips in Java Compress Large File