You can return binary data from the Actions. In the action's 
perform()/execute(), instead of returning a forward mapping, what you can 
do is:
    * Set the correct content type and header by calling 
response.setContentType() and setHeader()
    * Get the output stream from response.getOutputStream() and stream 
whatever binary data you need to return
    * at the end of the perform()/execute() method, return null.
At 01:09 pm 13-08-2002, you wrote:
>Hi all,
>
>     I'm going to develop a java application with java client on client side
>which talks to a controller servlet. The data transmitted between client and
>server may be serialized object.
>     Does Struts support java client by outputting a serialized object as a
>HTTP response instead of forwarding to a JSP? If yes, would anyone give me
>some hints? Thanks.
>
>Best Regards,
>Leslie
>
>
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