Trying to set the output from jsp page into GZIP format ...

["Charlesworth, Chico" <Ch...@softwareag.co.uk>]

Has anyone tried this?
 
In the servlet you can simply do the following:
 
   PrintWriter out;
 
   boolean supportCompression = false;
   if (request instanceof HttpServletRequest) {
     Enumeration e =
((HttpServletRequest)request).getHeaders("Accept-Encoding");
     while (e.hasMoreElements()) {
       String name = (String)e.nextElement();
       if (name.indexOf("gzip") != -1) {
          supportCompression = true;
       }
     }
   }

   if (!supportCompression) {
    System.out.println("--------------------------------------> NOT
COMPRESSING"); 
    out.getWriter(); 
   }
   else {
    System.out.println("-------------------------------------->
COMPRESSING");
    
    if (response instanceof HttpServletResponse) {
      OutputStream out1 = response.getOutputStream();
      out = new PrintWriter(new GZIPOutputStream(out1), false));
      response.setHeader("Content-Encoding", "gzip"); 
    }
   } 
 
But because I'm using struts, changing the JSP page into a servlet will b
difficult if not impossible. 
Does anyone know of another way around this?
 
cheers,
Chico.  
 

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Re: Trying to set the output from jsp page into GZIP format ...

["Craig R. McClanahan" <cr...@apache.org>]

In servlet 2.2 environments, you basically won't be able to do this.  But
in servlet 2.3 environments, you can create a Filter to do the compression
for you, on output from either servlets or JSP pages.

Tomcat 4 includes a compression filter in the "examples" web app that does
exactly this.  You're welcome to use it on any servlet 2.3-compatible
server.

Craig McClanahan



On Thu, 12 Jul 2001, Charlesworth, Chico wrote:

> Has anyone tried this?
>  
> In the servlet you can simply do the following:
>  
>    PrintWriter out;
>  
>    boolean supportCompression = false;
>    if (request instanceof HttpServletRequest) {
>      Enumeration e =
> ((HttpServletRequest)request).getHeaders("Accept-Encoding");
>      while (e.hasMoreElements()) {
>        String name = (String)e.nextElement();
>        if (name.indexOf("gzip") != -1) {
>           supportCompression = true;
>        }
>      }
>    }
> 
>    if (!supportCompression) {
>     System.out.println("--------------------------------------> NOT
> COMPRESSING"); 
>     out.getWriter(); 
>    }
>    else {
>     System.out.println("-------------------------------------->
> COMPRESSING");
>     
>     if (response instanceof HttpServletResponse) {
>       OutputStream out1 = response.getOutputStream();
>       out = new PrintWriter(new GZIPOutputStream(out1), false));
>       response.setHeader("Content-Encoding", "gzip"); 
>     }
>    } 
>  
> But because I'm using struts, changing the JSP page into a servlet will b
> difficult if not impossible. 
> Does anyone know of another way around this?
>  
> cheers,
> Chico.  
>  
> 
> -- 
> The content of this e-mail is confidential, may contain privileged material
> and is intended solely for the recipient(s) named above. If you receive this
> in error, please notify Software AG immediately and delete this e-mail.
> 
> Software AG (UK) Limited
> Registered in England & Wales 1310740
> Registered Office: Hudson House, Hudson Way,
> Pride Park, Derby DE24 8HS
>