Question

我正在尝试将文件上传到Amazon S3，没什么特别的。我已设法进行实际上传，文件上传成功。剩下的唯一问题是如何取消或中止putobject请求

Answer 1

我遇到了同样的问题，最后使用FileInputStream代替File PutRequest并强制关闭流以取消上传。

这会取消put请求，因为它无法再次尝试，因为它缺少对文件的引用。

InputStream inputStream = new FileInputStream(file);
ObjectMetadata metadata = new ObjectMetadata();
metadata.setContentLength(file.length());
PutObjectRequest request = new PutObjectRequest(bucket, key, inputStream, metadata);

取消上传

inputStream.close();

不幸的是，这会使用ClientProtocolException堆栈跟踪来填充logcat。

Answer 2

要取消上传，请看一看，我也一样，并且工作正常。

public static void main(String[] args) throws Exception {
    String clientRegion = "*** Client region ***";
    String bucketName = "*** Bucket name ***";
    String keyName = "*** Object key ***";
    String filePath = "*** Path to file to upload ***";

    try {
        AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                .withRegion(clientRegion)
                .withCredentials(new ProfileCredentialsProvider())
                .build();
        TransferManager tm = TransferManagerBuilder.standard()
                            .withS3Client(s3Client)
                            .build();
        PutObjectRequest request = new PutObjectRequest(bucketName, keyName, new File(filePath));

        // To receive notifications when bytes are transferred, add a  
        // ProgressListener to your request.
        request.setGeneralProgressListener(new ProgressListener() {
            public void progressChanged(ProgressEvent progressEvent) {
                System.out.println("Transferred bytes: " + progressEvent.getBytesTransferred());
                }
        });
        // TransferManager processes all transfers asynchronously,
        // so this call returns immediately.
        Upload upload = tm.upload(request);

        // Optionally, you can wait for the upload to finish before continuing.
        upload.waitForCompletion();
    }
    catch(AmazonServiceException e) {
        // The call was transmitted successfully, but Amazon S3 couldn't process 
        // it, so it returned an error response.
        e.printStackTrace();
    }
    catch(SdkClientException e) {
        // Amazon S3 couldn't be contacted for a response, or the client 
        // couldn't parse the response from Amazon S3.
        e.printStackTrace();
    }
}

参考：https://docs.aws.amazon.com/AmazonS3/latest/dev/HLTrackProgressMPUJava.html

用于取消在后台线程上使用以下代码进行上传

transferManager.shutdownNow();

取消Amazon S3 Put对象请求

2 个答案: