If you use Fiddler as a proxy, you can save archives of all requests and responses out of SoapUI. This might be easier than finding or writing code that will let you do this.
1. Download Fiddler here:
http://www.fiddler2.com2. Install Fiddler
3. Set SoapUI => Preferences => Proxy Settings to host = 127.0.0.1 and port 8888. Check off "enable using proxy." When Fiddler is open, this will send your SoapUI requests through Fiddler.
4. Open Fiddler.
5. Send your requests through SoapUI. (You can filter traffic through Fiddler to show only requests made to to certain hosts.)
6. In Fiddler, use the File => Save option to save a Fiddler archive of all or selected requests/responses.
This isn't an automatic save, but it might get you where you want to go.
