如下代码，是java后台的一个response，为什么下载docx没有问题，而下载xlsx跟png、txt有问题？

Question

`

private String getYxPicById(HttpServletRequest request,HttpServletResponse response) {
        try {
            request.setCharacterEncoding("utf-8");
            String YxPicId = (String) request.getParameter("YxPicId");
            String ATTACHMENT_NAME = (String) request.getParameter("ATTACHMENT_NAME");
            ATTACHMENT_NAME = URLDecoder.decode(ATTACHMENT_NAME, "UTF-8");
            logger.info("ATTACHMENT_NAME:"+ATTACHMENT_NAME);
            logger.info("YxPicId:"+YxPicId);
            boolean result =  getPicFromYxpt(request,YxPicId,ATTACHMENT_NAME);
            response.setHeader("Content-Disposition", "attachment;filename="+ATTACHMENT_NAME);
            response.setContentType("application/x-msdownload");
            if (result) {
                ServletContext ctx = request.getSession().getServletContext();
                InputStream is = ctx.getResourceAsStream("/upload/attachment/"+ATTACHMENT_NAME);
                OutputStream os = response.getOutputStream();
                byte[] buffer = new byte[1024];
                int i = -1;
                while ((i = is.read(buffer)) != -1) {
                    os.write(buffer, 0, i);
                }
                os.flush();
                os.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

`

Answer 1

response.setContentType("application/x-msdownload");

已经指定数据格式为word。