通过COS多版本功能快速批量恢复数据

final int maxKeyNum = 400;
ListVersionsRequest listVersionsRequest = new ListVersionsRequest();
listVersionsRequest.withBucketName(srcbucket).withPrefix(keyPrefix).withMaxResults(maxKeyNum);

VersionListing versionListing = cossrcclient.listVersions(listVersionsRequest);
List < String > objectlist = new ArrayList < String > ();

int i = 0;
while (true) {
    List < COSVersionSummary > versionSummaries = versionListing.getVersionSummaries();

    for (COSVersionSummary versionInfo: versionSummaries) {
        // 对相同可key的文件list出来的顺序是版本号由近到远
        i++;

        String versionId = versionInfo.getVersionId();
        String key = versionInfo.getKey();
        long expectedLength = versionInfo.getSize();
        String expectedEtag = versionInfo.getETag();
        Boolean islatest = versionInfo.isLatest();
        Owner owner = versionInfo.getOwner();
        String getStorageClass = versionInfo.getStorageClass();
        Boolean isDeleteMarker = versionInfo.isDeleteMarker();

        System.out.println("Id:" + i); //ID
        System.out.println("versionId:" + versionId); //版本ID
        System.out.println("key:" + key); //对象全称
        System.out.println("islatest:" + islatest); //是否最新
        System.out.println("isDeleteMarker:" + isDeleteMarker); //是否有删除标记
        System.out.println("expectedLength:" + expectedLength); //对象大小
        System.out.println("expectedEtag:" + expectedEtag); //Etag值
        System.out.println("Owner:" + owner.getId() + ":" + owner.getDisplayName()); //资源拥有者ID和名称
        System.out.println("getStorageClass:" + getStorageClass); //对象类型

        if (isDeleteMarker == false) //标记不是删除标记的记录
        {
            if (islatest == true) //标记是最新的记录
            {
                System.out.println("最新版文件,拷贝" + "key:" + key + ",version:" + versionId);
                copyObjectRequest(cosdstclient, srcappid, srcbucket, key, versionId, dstbucket, key);
                objectlist.add(key);
            } else {
                if (!copiedobject(key, objectlist)) {
                    System.out.println("次新文件,拷贝" + "key:" + key + ",version:" + versionId);
                    copyObjectRequest(cosdstclient, srcappid, srcbucket, key, versionId, dstbucket, key);
                    objectlist.add(key);
                }

            }
        }
    }
    if (!versionListing.isTruncated()) {

        break;
    }
    versionListing = cossrcclient.listNextBatchOfVersions(versionListing); //列出下一批版本
    System.out.println("--------------------------------------");
}

private static Boolean copiedobject(String object, List < String > objectlist) {
    for (int i = 0; i < objectlist.size(); i++) {
        //System.out.println("object:"+object);
        //System.out.println("objectlist.get(i):"+objectlist.get(i));
        if (object.equals(objectlist.get(i))) {
            return true;
        }
    }
    return false;
}