上一篇文章說了一下檔案上傳至oss：https://blog.csdn.net/new_programmer_h/article/details/84307005

這裡說一下上傳後的一些後續操作：常用的獲取圖片縮率圖、獲取視訊截幀生成封面圖。自我感覺阿里oss對於這些處理封裝的很好，只要根據："%s|sys/saveas,o_%s,b_%s" 格式設定想要處理的方式他就會針對視訊或者圖片進行處理。

    private static String endpoint = "http://oss-cn-beijing.aliyuncs.com"; 
    private static String accessKeyId = "<yourAccessKeyId>";
    private static String accessKeySecret = "<yourAccessKeySecret>";
    private static String bucketName = "<yourBucketName>";

圖片上傳至oss後獲取縮率圖工具類：

   /**
     * 圖片處理：生成縮率圖
     *
     * @author LH_Yu
     * @Param uploadFile 上傳檔案
     * @Param picturePath 原圖key
     * @Param thumbPath 縮率圖上傳路徑及取出url的key
     * "%s|sys/saveas,o_%s,b_%s" 具體處理格式化
     */
    public static String compressPicture(MultipartFile uploadFile, String picturePath, String thumbPath) throws Exception {
        // 建立OSSClient例項。
        OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
        // 圖片處理持久化 : 縮放
        StringBuilder sbStyle = new StringBuilder();
        Formatter styleFormatter = new Formatter(sbStyle);
        //設定圖片
        String styleType = "image/resize,m_lfit,w_400,h_400"; //圖片設定
        String targetImage = thumbPath + uploadFile.getOriginalFilename();
        styleFormatter.format("%s|sys/saveas,o_%s,b_%s", styleType,
                BinaryUtil.toBase64String(targetImage.getBytes()),
                BinaryUtil.toBase64String(bucketName.getBytes()));
        ProcessObjectRequest request = new ProcessObjectRequest(bucketName, picturePath + uploadFile.getOriginalFilename(), sbStyle.toString());
        GenericResult processResult = ossClient.processObject(request);
        processResult.getResponse().getContent().close();
        //設定過期時間 -- 十年
        Date expiration = new Date(new Date().getTime() + 3600l * 1000 * 24 * 365 * 10);
        String url = ossClient.generatePresignedUrl(bucketName, thumbPath + uploadFile.getOriginalFilename(), expiration).toString();
        return url;
    }
 

視訊上傳至oss後截幀獲取視訊封面圖工具類：

     * 視訊處理：視訊截幀生成封面圖
     *
     * @author LH_Yu
     * @Param uploadFile 上傳檔案
     * @Param videoPath 原視訊key
     * @Param coverPicturePath 封面圖上傳路徑及取出url的key
     * "%s|sys/saveas,o_%s,b_%s" 具體處理格式化
     */
    public static String coverPicture(MultipartFile uploadFile, String videoPath, String coverPicturePath) throws Exception {
        // 建立OSSClient例項。
        OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
        // 圖片處理持久化 : 截幀生成封面圖
        StringBuilder sbStyle = new StringBuilder();
        Formatter styleFormatter = new Formatter(sbStyle);
        //設定圖片處理
        String styleType = "video/snapshot,t_3000,f_jpg,w_800,h_0,m_fast";//視訊處理
        String targetImage = coverPicturePath + uploadFile.getOriginalFilename();
        styleFormatter.format("%s|sys/saveas,o_%s,b_%s", styleType,
                BinaryUtil.toBase64String(targetImage.getBytes()),
                BinaryUtil.toBase64String(bucketName.getBytes()));
        ProcessObjectRequest request = new ProcessObjectRequest(bucketNamePrivate, videoPath + uploadFile.getOriginalFilename(), sbStyle.toString());
        GenericResult processResult = ossClient.processObject(request);
        processResult.getResponse().getContent().close();
        //設定過期時間 -- 十年
        Date expiration = new Date(new Date().getTime() + 3600l * 1000 * 24 * 365 * 10);
        String url = ossClient.generatePresignedUrl(bucketName, coverPicturePath + uploadFile.getOriginalFilename(), expiration).toString();
        return url;
    }