Display file in the desktop

Hello Experts,

We have ESS Leave application built using Java web dynpro, but the leave records will be sent to SAP server using some custom function module.

Recently we got a requirement to attach files while creating a leave request. We implemented  GOS(Generic Object Services) functionality. So attached file from java webdynpro will be converted to a XSTRING and sent to the SAP server. I can save and retrieve the file content in the SAP server. Now the problem is i am unable to display the file content.I cannot use  cl_wd_runtime_services=>attach_file_to_response since it can only work with ABAP Webdynpro. So the function module dumps. Pls suggest.

Any suggestion is highly appreciated.

Thanks

Vivek