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            <%        String path = request.getContextPath();        String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";    %>    <%        String para = request.getParameter("a");        response.setContentType("application/x-download");        String filePath = "/" + para;        String displayName = para;        displayName = URLEncoder.encode(displayName, "UTF-8");        response.addHeader("Content-Disposition", "attachment;filename=" + displayName);    %>    <%        try {            RequestDispatcher dis = application.getRequestDispatcher(filePath);            if (dis != null) {                dis.forward(request, response);            }            response.flushBuffer();        } catch (Exception e) {            e.printStackTrace();        } finally {            out.clear();            out = pageContext.pushBody();        }    %>