Differences between ServletResponse and HttpServletResponseWrapper?
问题 I am new to servlet and reading some text about filters and wrappers. I can understand filters but got confused about wrappers. In the book, the author gives an example: In case no wrapper: public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { String name = request.getParameter("name").trim(); try { chain.doFilter(request, response); PrintWriter out = response.getWriter(); if (name.length() == 0) { out.println("Some