Question

我正在尝试使用预签名的URL将文件上传到AWS s3。这是我的代码：

public void uploadImage(MultipartFile file) {
    Date expiration = new Date(System.currentTimeMillis() + 1000 * 60 * 60);
    // Generate the pre-signed URL.
    System.out.println("Generating pre-signed URL.");
    GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest(bucketName, this
            .generateFileName(file))
            .withMethod(HttpMethod.PUT)
            .withExpiration(expiration);
    URL url = s3client.generatePresignedUrl(generatePresignedUrlRequest);
    api.uploadFileTos3bucket(file, url);
}

public Response uploadFileTos3bucket(MultipartFile file, URL url) {
    WebTarget t = createRequest(url);
    Response r = this.getResponse("uploadImageToS3", t, file);
    return r;
}
private File convertMultiPartToFile(MultipartFile file) throws IOException {
    File convFile = new File(file.getOriginalFilename());
    FileOutputStream fos = new FileOutputStream(convFile);
    fos.write(file.getBytes());
    fos.close();
    return convFile;
}

protected Response getResponse(String apiName, WebTarget t, MultipartFile file) {
    MultiPart fileEntity = null;
    try {
        File fileToUpload = this.convertMultiPartToFile(file);
        fileEntity = new MultiPart();
        if (fileToUpload != null) {
            fileEntity.bodyPart(new FileDataBodyPart("file", fileToUpload,
                    MediaType.APPLICATION_OCTET_STREAM_TYPE));
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    Response r = t.request().put(Entity.entity(fileEntity, fileEntity.getMediaType()));
    if (r.getStatus() == 200) {
        return r;

    } else {
        log.error("API error: " + r.readEntity(String.class));
        throw new ServerRuntimeException("Failed to call " + apiName + " API due to status " + r.getStatus());
    }
}

// common helper for creating a base request with standard fields set
protected WebTarget createRequest(URL url) {
    try {
        return CLIENT.target(url.toURI()).register(MultiPartFeature.class);
    } catch (URISyntaxException e) {
        throw new ServerRuntimeException("Failed to transform url " + url.toString() + " to uri");
    }
}

我注意到，每次上传文件后，都会在我的应用程序根文件夹下创建一个相同的副本。如何防止应用程序中的文件复制？这是调用预签名URL上载文件的正确方法吗？

Spring Boot使用预签名的URL将文件上传到aws

0 个答案: