Tutorials : Six Steps to Faster J2EE Apps: Performance Tuning with JSP and Servlets :

Step 6: Use gzip cCompression

Most browsers these days support gzip. Basically, sending data in gzip-compressed format gets your data to the client faster. The following code sample shows how:

public void doGet(HttpServletRequest httpServletRequest, HttpServletResponse
httpServletResponse)
          throws IOException, ServletException{
          
   OutputStream out = null

   // Perform the check to see if the requesting client can support the format.
   // We can check the from the Accepting-Encoding header of the HTTP request.
   // If the header includes gzip, choose GZIP, else dont compress

   String encoding = httpServletRequest.getHeader("Accept-Encoding");    
      
   if (encoding != null && encoding.indexOf("gzip") != -1){
       httpServletResponse.setHeader("Content-Encoding" , "gzip");
       out = new GZIPOutputStream(httpServletResponse.getOutputStream());
   }
   else if (encoding != null && encoding.indexOf("compress") != -1){
       httpServletResponse.setHeader("Content-Encoding" , "compress");
       out = new ZIPOutputStream(httpServletResponse.getOutputStream());
   } 
   else{
       out = httpServletResponse.getOutputStream();

   }
   //Other methods will go here
}  

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