Question

由于我是该领域的新手，所以需要您的帮助。我想使用Azure存储Blob服务上载图像，列出和下载，但是遇到一些问题。

我已经从this repository导入了一个项目，并且一旦导入，我就会收到错误消息：

Description Resource    Path    Location    Type
Archive for required library: 'C:/Users/NUTRIP-DEVLP1/.m2/repository/org/apache/commons/commons-lang3/3.4/commons-lang3-3.4.jar' in project 'blobAzureApp' cannot be read or is not a valid ZIP file    blobAzureApp        Build path  Build Path Problem

Description Resource    Path    Location    Type
The project cannot be built until build path errors are resolved    blobAzureApp        Unknown Java Problem

我应该将其作为普通的Java应用程序还是Maven项目运行？如果是Maven，我该如何运行？

Answer 1

我建议您在Maven项目中使用官方的java sdk。

<dependency>
    <groupId>com.microsoft.azure</groupId>
    <artifactId>azure-storage-blob</artifactId>
    <version>10.1.0</version>
</dependency>

示例上传代码：

static void uploadFile(BlockBlobURL blob, File sourceFile) throws IOException {

    FileChannel fileChannel = FileChannel.open(sourceFile.toPath());

    // Uploading a file to the blobURL using the high-level methods available in TransferManager class
    // Alternatively call the Upload/StageBlock low-level methods from BlockBlobURL type
    TransferManager.uploadFileToBlockBlob(fileChannel, blob, 8*1024*1024, null)
        .subscribe(response-> {
            System.out.println("Completed upload request.");
            System.out.println(response.response().statusCode());
        });
}

示例列表代码：

static void listBlobs(ContainerURL containerURL) {
    // Each ContainerURL.listBlobsFlatSegment call return up to maxResults (maxResults=10 passed into ListBlobOptions below).
    // To list all Blobs, we are creating a helper static method called listAllBlobs, 
    // and calling it after the initial listBlobsFlatSegment call
    ListBlobsOptions options = new ListBlobsOptions(null, null, 10);

    containerURL.listBlobsFlatSegment(null, options)
        .flatMap(containersListBlobFlatSegmentResponse -> 
            listAllBlobs(containerURL, containersListBlobFlatSegmentResponse))    
                .subscribe(response-> {
                    System.out.println("Completed list blobs request.");
                    System.out.println(response.statusCode());
                });
}

private static Single <ContainersListBlobFlatSegmentResponse> listAllBlobs(ContainerURL url, ContainersListBlobFlatSegmentResponse response) {                
    // Process the blobs returned in this result segment (if the segment is empty, blobs() will be null.
    if (response.body().blobs() != null) {
        for (Blob b : response.body().blobs().blob()) {
            String output = "Blob name: " + b.name();
            if (b.snapshot() != null) {
                output += ", Snapshot: " + b.snapshot();
            }
            System.out.println(output);
        }
    }
    else {
        System.out.println("There are no more blobs to list off.");
    }

    // If there is not another segment, return this response as the final response.
    if (response.body().nextMarker() == null) {
        return Single.just(response);
    } else {
        /*
        IMPORTANT: ListBlobsFlatSegment returns the start of the next segment; you MUST use this to get the next
        segment (after processing the current result segment
        */

        String nextMarker = response.body().nextMarker();

        /*
        The presence of the marker indicates that there are more blobs to list, so we make another call to
        listBlobsFlatSegment and pass the result through this helper function.
        */

    return url.listBlobsFlatSegment(nextMarker, new ListBlobsOptions(null, null,1))
        .flatMap(containersListBlobFlatSegmentResponse ->
            listAllBlobs(url, containersListBlobFlatSegmentResponse));
    }
}

示例下载代码：

static void getBlob(BlockBlobURL blobURL, File sourceFile) {
    try {
        // Get the blob using the low-level download method in BlockBlobURL type
        // com.microsoft.rest.v2.util.FlowableUtil is a static class that contains helpers to work with Flowable
        blobURL.download(new BlobRange(0, Long.MAX_VALUE), null, false)
            .flatMapCompletable(response -> {
                AsynchronousFileChannel channel = AsynchronousFileChannel.open(Paths
                    .get(sourceFile.getPath()), StandardOpenOption.CREATE,  StandardOpenOption.WRITE);
                        return FlowableUtil.writeFile(response.body(), channel);
            }).doOnComplete(()-> System.out.println("The blob was downloaded to " + sourceFile.getAbsolutePath()))
            // To call it synchronously add .blockingAwait()
            .subscribe();
    } catch (Exception ex){
        System.out.println(ex.toString());
    }
}

更多详细信息，请参阅此doc。希望它对您有所帮助。

如何使用Azure存储Blob服务

1 个答案: