java - 如何在Java中获取FileInputStream中的azure blob存储内容？

Question

我正在开发 API(Spring Boot)。其中我需要在 get 方法的响应主体中返回 FileInputStream。

预期 - 当前端调用 get-files API 时，浏览器上应该打开文件下载提示。

问题 - 我们无法使用 blob.downloadToFile 方法，因为它将在本地计算机(或托管 API 的位置)上下载文件，并且我们需要可以直接发送文件的东西到 API 调用的前端。 然而，还有另一种方法blob.download()，它返回OutputStream，而API调用时无法返回该OutputStream。

有没有什么方法可以将 OutputStream 转换为 FileInputStream，而无需保存到设备上的实际文件。

示例代码-

public ByteArrayOutputStream downloadBlob() throws URISyntaxException, InvalidKeyException, StorageException, IOException {
        String storageConnectionString = "DefaultEndpointsProtocol=https;" + "AccountName=" + accountName + ";"
                + "AccountKey=" + accountKey;

        CloudStorageAccount storageAccount = CloudStorageAccount.parse(storageConnectionString);

        CloudBlobClient blobClient = storageAccount.createCloudBlobClient();

        final CloudBlobContainer container = blobClient.getContainerReference("container name");


        CloudBlockBlob blob = container.getBlockBlobReference("image.PNG");
        ByteArrayOutputStream outputStream =new ByteArrayOutputStream();
        blob.download(outputStream);
        System.out.println("file downloaded");

        return outputStream;
    }

注意 - 文件可以是任何类型。

Answer 1

这是解决方案 - 在浏览器中点击 API 后，您的文件将在浏览器中下载 -

package com.example.demo.controllers;

import com.azure.storage.blob.BlobClient;
import com.azure.storage.blob.BlobContainerClient;
import com.azure.storage.blob.BlobServiceClient;
import com.azure.storage.blob.BlobServiceClientBuilder;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;


@RestController
public class FileDownload {
    @GetMapping(path="/download-file")
    public ResponseEntity<Resource> getFile(){
        String fileName = "Can not find symbol.docx";
        //azure credentials
        String connection_string = "Connection String of storage account on azure";

        BlobServiceClient blobServiceClient = new BlobServiceClientBuilder().connectionString(connection_string).buildClient();

        BlobContainerClient containerClient= blobServiceClient.getBlobContainerClient("Container name");
        System.out.println(containerClient.getBlobContainerName());

        BlobClient blob = containerClient.getBlobClient(fileName);

        //creating an object of output stream to recieve the file's content from azure blob.
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        blob.download(outputStream);

        //converting it to the inputStream to return
        final byte[] bytes = outputStream.toByteArray();
        ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
        ByteArrayResource resource = new ByteArrayResource(bytes);
        HttpHeaders headers = new HttpHeaders();
        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + fileName + "\"");

        return ResponseEntity.ok().contentType(MediaType.APPLICATION_OCTET_STREAM)
                .headers(headers)
                .body(resource);
    }

}