javaWeb後端下載磁盤文件

@RequestMapping(value = "/download")
    public void queryByDictType(HttpServletRequest request, HttpServletResponse response) {
        String pathStr = request.getParameter("path")//文件路徑
        response.addHeader("Content-type", "appllication/octet-stream");//下載標識
		response.addHeader("Content-Disposition", "attachment;filename="+pathStr);////下載標識

        try (InputStream in = new FileInputStream(fileName);
             OutputStream out = response.getOutputStream()) {        
            int i;
            while ((i = in.read()) != -1) {
                out.write(i);
            }
           
        } catch (Exception e) {
            
        }
    }