/*
* Copyright 2003 Jayson Falkner (jayson@jspinsider.com)
* This code is from "Servlets and JavaServer pages; the J2EE Web Tier",
* http://www.jspbook.com. You may freely use the code both commercially
* and non-commercially. If you like the code, please pick up a copy of
* the book and help support the authors, development of more free code,
* and the JSP/Servlet/J2EE community.
*/
package com.common.web.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.common.web.support.gzip.GZIPResponseWrapper;
public class GZIPFilter implements Filter {
private static Logger log = LoggerFactory.getLogger(GZIPFilter.class);
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
if (req instanceof HttpServletRequest) {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
String ae = request.getHeader("accept-encoding");
if (ae != null && ae.indexOf("gzip") != -1) {
log.debug("GZIP supported, compressing.");
GZIPResponseWrapper wrappedResponse = new GZIPResponseWrapper(response);
chain.doFilter(req, wrappedResponse);
wrappedResponse.finishResponse();
return;
}
chain.doFilter(req, res);
}
}
public void init(FilterConfig filterConfig) {
// noop
}
public void destroy() {
// noop
}
}