1     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
 2         log.info("response.isCommitted() => " + response.isCommitted());
 3         if (response.isCommitted()) {
 4             HttpServletRequest req = (HttpServletRequest) request;
 5             HttpServletResponse resp = (HttpServletResponse) response;
 6             Cookie[] cks = req.getCookies();
 7             for (int i = 0; cks != null && i < cks.length; i++) {
 8                 log.info("cookie:\t" + cks[i].getName() + " => " + cks[i].getValue());
 9             }
10             java.util.Enumeration<String> enu = req.getHeaderNames();
11             while (enu.hasMoreElements()) {
12                 String s = enu.nextElement();
13                 log.info("header:\t" + s + " => " + req.getHeader(s));
14             }
15             log.info("response.getCharacterEncoding() => " + response.getCharacterEncoding());
16             log.info("response.getLocale().getLanguage() => " + response.getLocale().getLanguage());
17             log.info("response.getContentType() => " + response.getContentType());
18             log.info("request.getRequestURI() => " + req.getRequestURI());
19             throw (new IOException("----xxx--->>>   response is committed."));
20         }
21        
22         response.setCharacterEncoding(encoding);
23         response.setContentType("text/html; charset=utf-8");
24         chain.doFilter(request, response);
25         response.setCharacterEncoding(encoding);
26         response.setContentType("text/html; charset=utf-8");
27     }
28 

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