使用 AmazonS3Client java 在 S3 上上传文件 [关闭]答案

【问题标题】：Upload file on S3 using AmazonS3Client java [closed]使用 AmazonS3Client java 在 S3 上上传文件 [关闭]
【发布时间】：2011-10-31 11:04:09
【问题描述】：

我正在使用第三方服务器，它会返回以下内容。 1）网址 2)acl 3）政策 4)awsAccesskeyID 5)签名 6）钥匙我可以使用以下代码上传文件

final File localFile = new File(localFilePath);

final Part[] parts = { new StringPart("acl", acl),
    new StringPart("policy", policy),
    new StringPart("AWSAccessKeyId", awsAccessKeyId),
    new StringPart("signature", signature),
    new StringPart("key", key, HTTP.UTF_8), 
    new FilePart("file", localFile) };

    final MultipartRequestEntity mpRequestEntity = new MultipartRequestEntity(parts, filePost.getParams());

    filePost.setRequestEntity(mpRequestEntity);
    final HttpClient client = new HttpClient();
    try
    {

       status = client.executeMethod(filePost);
    }

但现在我想使用 AmazonS3Client 使用以下代码，但它会抛出异常

10-31 16:21:36.070：INFO/com.amazonaws.request(13882)：收到错误响应：状态代码：403，AWS 请求 ID：51F7CB27E58F88FD，AWS 错误代码：SignatureDoesNotMatch，AWS 错误消息：请求我们计算的签名与您提供的签名不匹配。检查您的密钥和签名方法。S3 扩展请求 ID： YwNNsWOXg71vXY1VS0apHnHpHp4YVWRJ63xm8C7w36SYg1MNuIykw75YhQco5Lk7

        final AmazonS3Client s3Client = new AmazonS3Client(new BasicAWSCredentials(awsAccessKeyId, key));


        // Create a list of UploadPartResponse objects. You get one of these
        // for each part upload.
        final List<PartETag> partETags = new ArrayList<PartETag>();

        // Step 1: Initialize.
        final InitiateMultipartUploadRequest initRequest = new InitiateMultipartUploadRequest(targetURL, key);
        final InitiateMultipartUploadResult initResponse = s3Client.initiateMultipartUpload(initRequest);

        final File file = new File(localFilePath);
        final long contentLength = file.length();
        long partSize = 5242880; // Set part size to 5 MB.

        try
        {
            // Step 2: Upload parts.
            long filePosition = 0;
            for ( int i = 1; filePosition < contentLength; i++ )
            {
                // Last part can be less than 5 MB. Adjust part size.
                partSize = Math.min(partSize, (contentLength - filePosition));

                // Create request to upload a part.
                final UploadPartRequest uploadRequest = new UploadPartRequest().withBucketName(targetURL).withKey(key)
                        .withUploadId(initResponse.getUploadId()).withPartNumber(i).withFileOffset(filePosition)
                        .withFile(file).withPartSize(partSize);

                // Upload part and add response to our list.
                partETags.add(s3Client.uploadPart(uploadRequest).getPartETag());

                filePosition += partSize;
            }

            // Step 3: complete.
            final CompleteMultipartUploadRequest compRequest = new CompleteMultipartUploadRequest(targetURL, key,
                    initResponse.getUploadId(), partETags);

            s3Client.completeMultipartUpload(compRequest);
        }
        catch ( final Exception e )
        {
            s3Client.abortMultipartUpload(new AbortMultipartUploadRequest(targetURL, key, initResponse.getUploadId()));
            return false;
        }
        return true;

我错过了什么吗？

【问题讨论】：

完成..我对签名和密钥有误解..dextercoder.blogspot.in/2012/02/…
嗨，使用此代码，我如何暂停上传并稍后恢复？

标签： java file-upload amazon-s3 multipart

【解决方案1】：

我发现服务器发送签名以一次性上传文件。如果需要多部分上传多个签名，并且在各个步骤中都需要.. 在服务器共享密钥之前，无法多部分上传文件:(。

http://dextercoder.blogspot.in/2012/02/multipart-upload-to-amazon-s3-in-three.html

【讨论】：