Compress Filter

A simple Java servlet Filter to compress the returned pages

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
           throws IOException, ServletException {
       PrintWriter out = response.getWriter();

       // Create a wrapper to catch the output of the next Filter/Servlet in
       // the chain
       HttpServletResponseWrapper wrapper = new HttpServletResponseWrapper(
               (HttpServletResponse) response) {
           private CharArrayWriter output = new CharArrayWriter();;

           public String toString() {
               return output.toString();
           }

           public PrintWriter getWriter() {
               return new PrintWriter(output);
           }
       };
       // pass the request along the filter chain
       chain.doFilter(request, wrapper);

       String html = wrapper.toString();

       HtmlCompressor compressor = new HtmlCompressor();
       compressor.setCompressJavaScript(true);
       compressor.setRemoveComments(false);
       compressor.setSimpleDoctype(true);

       String compressedHtml;
       try {
           compressedHtml = compressor.compress(html);
           CharArrayWriter caw = new CharArrayWriter();
           caw.write(compressedHtml);
           response.setContentLength(caw.toString().getBytes().length);
           out.write(caw.toString());
           out.close();
       } catch (Exception e) {
           logger.error(e.getMessage());
           out.write(html);
           out.close();
       }
   }