问题：

在开发项目中，遇到前端传递多个图片URL到后端，实现图片的批量下载并压缩为Zip。

业务代码：

Controller

@PostMapping("/batchDownload")public void batchDownload(@RequestBody PassportDTO passportDTO, HttpServletResponse response) {    passportService.batchDownload(passportDTO, response);}

Service

public void batchDownload(PassportDTO passportDTO, HttpServletResponse response) {        String zipName = "通行证" + ".zip";        response.setHeader("content-type", "application/octet-stream");        response.setHeader("Content-disposition", "attachment;filename=" + zipName);        response.setCharacterEncoding("utf-8");        ZipOutputStream zipOutputStream = null;        try {            zipOutputStream = new ZipOutputStream(response.getOutputStream());            for (String pictureUrl : passportDTO.getPictureUrls()) {                String fileName = pictureUrl.substring(pictureUrl.lastIndexOf("/") + 1);                zipOutputStream.putNextEntry(new ZipEntry(fileName));                URL url = new URL(pictureUrl);                InputStream inputStream = new DataInputStream(url.openStream());                byte[] buff = new byte[1024];                int len;                while ((len = inputStream.read(buff)) != -1) {                    zipOutputStream.write(buff, 0, len);                }                zipOutputStream.closeEntry();                inputStream.close();            }        } catch (Exception e) {            e.printStackTrace();        } finally {            if (zipOutputStream != null) {                try {                    zipOutputStream.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }

说明：

通过图片路径创建输入流获取图片数据：

 File file = new File("/test/temp/vehicles/" + pictureUrl); InputStream inputStream = new FileInputStream(file);

通过图片URL路径创建输入流获取图片数据：

URL url = new URL(pictureUrl);InputStream inputStream = new DataInputStream(url.openStream());

路漫漫其修远兮，吾将上下而求索

译文：在追寻真理方面，前方的道路还很漫长，但我将百折不挠，不遗余力地去追求和探索。

如果您有什么好的想法与方法，欢迎在评论区留言，我们一起讨论~