GZIPFilter.java

package cn.jcenterhome.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 cn.jcenterhome.util.Common;
import cn.jcenterhome.util.JavaCenterHome;
import cn.jcenterhome.web.servlet.GZIPResponseWrapper;


public class GZIPFilter implements Filter {

	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException,
			ServletException {
		int gzipCompress = Common.intval(JavaCenterHome.jchConfig.get("gzipCompress"));
		if (gzipCompress == 1 && req instanceof HttpServletRequest) {
			HttpServletRequest request = (HttpServletRequest) req;
			HttpServletResponse response = (HttpServletResponse) res;
			String ae = request.getHeader("accept-encoding");
			if (ae != null && ae.indexOf("gzip") != -1) {
				GZIPResponseWrapper wrappedResponse = new GZIPResponseWrapper(response);
				chain.doFilter(req, wrappedResponse);
				wrappedResponse.finishResponse();
				return;
			}
		}
		chain.doFilter(req, res);
	}

	public void init(FilterConfig filterConfig) {
	}

	public void destroy() {
	}
}