How do I decompress a string in java?

The string is compressed with zip and is encoded base64.
I decocoded the string, I copied the string to a zip file and I tryed to decompress using the sample script(class UnZip2) from here: http://java.sun.com/developer/technicalArticles/Programming/compression/.
The error is
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(Unknown Source)
at java.util.zip.ZipFile.<init>(Unknown Source)
at UnZip2.main(UnZip2.java:12)
Decompression works with other archives.
I know the string is ok because the server where I send it makes a succesful decompression.

user10878887 wrote:
The string is compressed with zip and is encoded base64.
I decocoded the string, I copied the string to a zip file Expanding on the other reply...
It is likely that the problem is that the contents of the file incorrect.
Your statement suggests that you wrote the base64 string to the file. That would be wrong.
You needed to decode from base64 and then write the bytes to the file.

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