升级到 XML Java SDK

<!-- https://mvnrepository.com/artifact/com.qcloud/cos_api -->
<dependency>
    <groupId>com.qcloud</groupId>
    <artifactId>cos_api</artifactId>
    <version>5.x.x</version>
</dependency>


// 存储桶名称，格式为：BucketName-APPID
String bucketName = "examplebucket-1250000000";

// 以下是向这个存储桶上传一个文件的示例
String key = "exampleobject";
// 本地文件路径
String localFilePath = "/path/to/localFile";
File localFile = new File(localFilePath);
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, key, localFile);
// 设置存储类型：标准存储（Standard）, 低频存储（Standard_IA）和归档存储（ARCHIVE）。默认是标准存储（Standard）
putObjectRequest.setStorageClass(StorageClass.Standard_IA);

PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
// putobjectResult 会返回文件的 etag
String etag = putObjectResult.getETag();

ClientConfig clientConfig = new ClientConfig(new Region("ap-beijing-1"));
COSClient cosClient = new COSClient(cred, clientConfig);

String bucketName = "examplebucket-1250000000";
cosClient.putObject(bucketName, "project/folder1/picture.jpg", "content");
cosClient.putObject(bucketName, "project/folder2/text.txt", "content");
cosClient.putObject(bucketName, "project/folder2/music.mp3", "content");
cosClient.putObject(bucketName, "project/video.mp4", "content");

ListObjectsRequest listObjectsRequest = new ListObjectsRequest();
listObjectsRequest.setBucketName(bucketName);
listObjectsRequest.setPrefix("project/");
listObjectsRequest.setDelimiter("/");
// 实际使用，您可以将 maxKeys 设为最大值 1000，以减少请求次数
listObjectsRequest.setMaxKeys(2);
String nextMarker = "";
for (; ; ) {
    listObjectsRequest.setMarker(nextMarker);
    ObjectListing objectListing = cosClient.listObjects(listObjectsRequest);
    // getCommonPrefixes + getObjectSummaries 返回条目数 <= maxKeys
    // 两次循环会输出 project/folder1/ 和 project/folder2/
    for (String prefix : objectListing.getCommonPrefixes()) {
        System.out.println(prefix);
    }
    // 两次循环会输出 project/video.mp4
    for (COSObjectSummary object : objectListing.getObjectSummaries()) {
        System.out.println(object.getKey());
    }
    // 判断是否还有条目
    if (!objectListing.isTruncated()) {
        break;
    }
    // 一次未获取完毕，以 nextMarker 作为下一次 listObjects 请求的 marker
    nextMarker = objectListing.getNextMarker();
}

String key = "exampleobject";
File localFile = new File(localFilePath);
String bucketName = "examplebucket-1250000000";
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, key, localFile);
// 返回一个异步结果 Upload, 可同步的调用 waitForUploadResult 等待 upload 结束, 成功返回 UploadResult, 失败抛出异常.
Upload upload = transferManager.upload(putObjectRequest);
Thread.sleep(1000);

// 暂停任务，获取 PersistableUpload
PersistableUpload persistableUpload = upload.pause();
//也可通过如下方式，获取 PersistableUpload
// while(persistableUpload == null) {
//     persistableUpload = upload.getResumeableMultipartUploadId();
//     System.out.println(System.currentTimeMillis());
//     Thread.sleep(100);
// }
// 恢复上传
upload = transferManager.resumeUpload(persistableUpload);
// 等待上传任务完成
UploadResult uploadResult = upload.waitForUploadResult();
System.out.println(uploadResult.getETag());