[S2] How to download a file from a hyperlink

[Struts2 Fan]

Hi all,

I searched the archieves but couldn't find the answer for S2. I just want
the download a file from a hyperlink but the type is not important. 

here is the part of the struts.xml

        <action name="showFile" class="ShowFileAction">
            <result name="success" type="stream">
                ???
                inputStream
                ???
                4096
            </result>
        </action>

In my action I return an inputStream.

public class ShowFileAction extends BaseAction{
    public InputStream getInputStream() throws Exception {
        // it works right because the images are shown clearly. 
        return new FileInputStream("/a.rar"); // or "b.exe"
    }
    public String execute() throws Exception {
        return SUCCESS;
    }
}

the hyperlink code is 
/showFile.html?fileName=a.rar download 

Any ideas?
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