Gziptest.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PushbackInputStream;
import java.util.zip.GZIPInputStream;

import javax.servlet.ServletException;
import javax.servlet.http.*;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.servlet.ServletHolder;


public class Gziptest {
	
	public static void main(String[] args) throws Exception {
		Server server = new Server(8080);
		 
		org.mortbay.jetty.servlet.Context context = new org.mortbay.jetty.servlet.Context(org.mortbay.jetty.servlet.Context.SESSIONS);
        context.setContextPath("/");
        server.setHandler(context);
 
        context.addServlet(new ServletHolder(new GzipHandlerServlet()),"/*");
        server.start();
        server.join();
	}
	
	

	@SuppressWarnings("serial")
	private static class GzipHandlerServlet extends HttpServlet
	{   	
	    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
	    {
	    	PushbackInputStream pb = new PushbackInputStream( request.getInputStream(), 2 );
	    	
	    	if(isGZIPed(pb)){
    		    GZIPInputStream gzis = new GZIPInputStream(pb);
    		    InputStreamReader isReader = new InputStreamReader( gzis );
    		    BufferedReader br = new BufferedReader(isReader);
	    		response.setContentType("text/html");
		        response.setStatus(HttpServletResponse.SC_OK);
		        response.getWriter().println("<h1>"+"hey,i got a gzip with follwong head\n\n\n\n"+"</h1>");
		        response.getWriter().write(br.readLine());
	    	}
	    	else{
	    		response.setStatus(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE);
	    		response.getWriter().println("you have failed me!!!");
	    	}
	        response.getWriter().println("session=" + request.getSession(true).getId());
	    }
	    
	    private boolean isGZIPed( PushbackInputStream pb)
	    {
	        boolean isGziped = false;
	        try
	        {
	            byte[] signature = new byte[2];
	            pb.read( signature );
	            pb.unread( signature );
	            int head = ( (int)signature[0] & 0xff ) | ( ( signature[1] << 8 ) & 0xff00 );
	            isGziped = GZIPInputStream.GZIP_MAGIC == head;
	        }
	        catch( Exception ioe )
	        {
	            log("",ioe);
	        }
	        return isGziped;
	    }
	    
	}

}