java文件批量下载并打包，求请教

Question

java下载多个文件，并打包，为啥我浏览器弹出来的下载链接都不是zip格式，但是如果将该文件修改拓展名为zip，下载文件又都在里面

    public static void downLoadZipAllFile(HttpServletRequest request, HttpServletResponse response, List<Map<String,String>> maps) {
        OutputStream outp = null;
        ZipOutputStream zos = null;
        BufferedInputStream bis = null;
        try {
            outp = response.getOutputStream();
            response.setContentType("text/html; charset=UTF-8"); //设置编码字符
            response.setContentType("application/octet-stream"); //设置内容类型为下载类型
//            response.setContentType("application/zip");// 定义输出类型
            String timeSuffix = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
            String zipFilePath = "D:/ftpHome/" + timeSuffix + "_DataFile.zip";
            String filedisplay = zipFilePath;
            if (filedisplay.indexOf("/") >= 0) {
                filedisplay = filedisplay.substring(filedisplay.lastIndexOf("/") + 1);
            } else if (filedisplay.indexOf("\\") >= 0) {
                filedisplay = filedisplay.substring(filedisplay.lastIndexOf("\\") + 1);
            }
            String agent = (String) request.getHeader("USER-AGENT");
            // firefox
            if (agent != null && agent.indexOf("MSIE") == -1) {
                String enableFileName = "=?UTF-8?B?"
                        + (new String(Base64.getBase64(filedisplay))) + "?=";
                response.setHeader("Content-Disposition",
                        "attachment; filename=" + enableFileName);
            } else {
                filedisplay = URLEncoder.encode(filedisplay, "utf-8");
                response.addHeader("Content-Disposition",
                        "attachment;filename=" + filedisplay);
            }
            try {
                File zip = new File(zipFilePath);
                if (!zip.exists()) {
                    zip.createNewFile();
                }
                zos = new ZipOutputStream(outp);
                for (Map<String, String> map : maps) {
                    String filePath = map.get("filePath");
                    String filename = map.get("fileName");
                    File file = new File(filePath);
                    if (file.exists()) {
                        zos.putNextEntry(new ZipEntry(filename));
                        bis = new BufferedInputStream(new FileInputStream(filePath));
                        byte[] b = new byte[1024 * 64];
                        int i = 0;
                        while ((i = bis.read(b)) > 0) {
                            zos.write(b, 0, i);
                        }
                        zos.closeEntry();
                        bis.close();
                        String isDelete = request.getParameter("isDelete");
                        if ("1".equals(isDelete)) {
                            file.delete();
                        }
                    } else {
                        outp.write("文件不存在!".getBytes("GBK"));
                    }
                }
                zos.close();
                bis = new BufferedInputStream(new FileInputStream(zipFilePath));
                byte[] buff = new byte[1024 * 64];
                bis.read(buff);
                outp.write(buff);//输出数据文件
                outp.flush();//释放缓存
                outp.close();
                bis.close();
            } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    if (bis != null) {
                        bis.close();
                        bis = null;
                    }
                    if (zos != null) {
                        zos.close();
                        zos = null;
                    }
                    if (outp != null) {
                        outp.close();
                        outp = null;
                    }
                }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

然后目前下载的文件的效果如下：

求各位解答一下

Answer 1

“Devil组”引证GPT后的撰写：
将响应头中的内容类型

“application/octet-stream”

更改为

“application/zip”