package dlog4j;

public class ContentTypeFilter extends HttpServlet implements Filter {
    private FilterConfig filterConfig;
    private String ct=null;
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
//在这里得到
      ct=  filterConfig.getInitParameter("contentType");
    }

    //Process the request/response pair
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain filterChain) {
        try {
           //在这里进行处理

            filterChain.doFilter(request, response);
        } catch (ServletException sx) {
            filterConfig.getServletContext().log(sx.getMessage());
        } catch (IOException iox) {
            filterConfig.getServletContext().log(iox.getMessage());
        }
    }

    //Clean up resources
    public void destroy() {
ct=null;
filterConfig=null;
    }
}