从阿里云OSS获取文件，下载打包

 从OSS服务上批量获取文件下载，并打包zip。

@Slf4j
@Component
@RefreshScope
public class OssBootUtil {


     /**
     * 初始化 oss 客户端
     *
     * @return
     */
    private static OSSClient initOSS(String endpoint, String accessKeyId, String accessKeySecret) {
        if (ossClient == null) {
            ossClient = new OSSClient(endpoint,
                    new DefaultCredentialProvider(accessKeyId, accessKeySecret),
                    new ClientConfiguration());
        }
        return ossClient;
    }


    /**
     * @param zipName 压缩文件名称
     * @param paths oss文件列表
     * @return
     */
    public static void getZipFromOSSByPaths(String zipName, List paths) {
        endPoint = "oss 路径";
        accessKeyId = "key";
        accessKeySecret = "秘钥";
        bucketName = "桶名称";
        initOSS(endPoint, accessKeyId, accessKeySecret);
        FileOutputStream fos = null;
        // 压缩文件输出流
        ZipOutputStream zos = null;
        try {
            // 创建zip文件
            fos = new FileOutputStream(zipName);
            // 作用是为任何OutputStream产生校验和
            // 第一个参数是制定产生校验和的输出流，第二个参数是指定Checksum的类型 （Adler32（较快）和CRC32两种）
            CheckedOutputStream cos = new CheckedOutputStream(fos, new Adler32());
            // 用于将数据压缩成zip文件格式
            zos = new ZipOutputStream(cos);

            OSSObject ossObject = null;
            InputStream is = null;
            // 循环根据路径从OSS获得对象，存入临时文件zip中
            for (String path : paths) {
                try {
                    log.info("下载文件路径 {}", path);
                    // 根据path 和 bucket 从OSS获取对象
                    ossObject = ossClient.getObject("dpxdata", path);
                    // 获取输出流
                    is = ossObject.getObjectContent();
                    // 将文件放入zip中，并命名不能重复
                    zos.putNextEntry(new ZipEntry(path));
                    // 向压缩文件中写数据
                    int len = 0;
                    while ((len = is.read()) != -1) {
                        zos.write(len);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    log.info("未找到文件 {}", path);
                    continue;
                } finally {
                    is.close();
                    zos.closeEntry();
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭流
                zos.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

Controller

    @GetMapping("/download2zip")
    public void export(HttpServletRequest request, HttpServletResponse response) {
        List pathList = new ArrayList<>();
        // https://oss域名/upload/agree/张**-《同意函》(2022-08-23)_1661246208735.pdf
        pathList.add("upload/agree/张**-《同意函》(2022-08-23)_1661246208735.pdf");
         String zipName = System.currentTimeMillis() + ".zip";
        // 设置响应类型，以附件形式下载文件
        response.reset();
        response.setContentType("text/plain");
        response.setContentType("application/octet-stream; charset=utf-8");
        response.setHeader("Location", zipName);
        response.setHeader("Cache-Control", "max-age=0");
        response.setHeader("Content-Disposition", "attachment; filename=" + zipName);
        OssBootUtil.getZipFromOSSByPath(zipName, pathList);
        BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
        final File tempZipFile = new File(zipName);
        FileUtils.copyFile(tempZipFile, bos);
        bos.close();
        if (tempZipFile.exists()) {
            tempZipFile.delete();
        }

    }