AmazonS3，如何检查是否上传成功了吗？ [英] AmazonS3, how to check if the upload succeeded?

问题描述

我写了一个简短的测试code在Java中上传在内存中生成一个PDF文件。在本次测试code我只是用一个虚拟的字节数组，但在实际使用中笔者将会把生成的PDF（最多2-3页）在该字节数组。一切正常：该文件被上传和权限设置

不过，因为我有一个PutObjectResult回来了，我想知道如何我应该检查一下。或者是不够看的例外AmazonClientException和AmazonServiceException？

在换句话说：如何检查上传succeded并没有破坏我的数据

 字符串桶=mybucket.example.com;
    字符串文件名=2011 /测试/的test.pdf;
    AmazonS3客户端=新AmazonS3Client（新BasicAWSCredentials（
        ACCESSKEY，SecretKey的））;
    字节[]内容=新的字节[] {1，2，3，4，5，6，7，8，9，10，11};
    InputStream的流=新ByteArrayInputStream的（内容）;
    ObjectMetadata元=新ObjectMetadata（）;
    meta.setContentLength（contents.length）;
    meta.setContentType（应用程序/ PDF格式）;
    PutObjectResult解析度= client.putObject（桶，文件名，流元）;
    client.setObjectAcl（桶，文件名，CannedAccessControlList.PublicRead）;
 

解决方案

我看AWS的来源$ C ​​$ c和调试，并发现了以下内容：

• 如果未提供的MD5它的计算（作品无论是真实的文件和InputStream的）
• 在当前MD5客户端和服务器端进行比较，如果它们不同的AmazonClientException被抛出上传完毕。 [行AmazonS3Client 1.19 1188]

在换句话说，要回答我的问题，这是不够的例外听，因为还上传了数据的MD5检查，因此，如果有一个腐败的异常将得到提升。

AmazonClientException和AmazonServiceException是强制异常，所以记得要听他们的，因为编译器不会强迫你这是非常重要的。

I wrote a short test code in Java to upload a PDF file generated in memory. In this test code I just use a dummy byte array, but in the real use I will put a generated PDF (max 2-3 pages) in that byte array. Everything works: the file gets uploaded and the permissions set.

However since I've a PutObjectResult returned, I was wondering how I'm supposed to check it. Or is it enough to look for the exceptions AmazonClientException and AmazonServiceException?

In other words: How to check that the upload succeded and didn't corrupt my data?

    String bucket = "mybucket.example.com";
    String fileName = "2011/test/test.pdf";
    AmazonS3 client = new AmazonS3Client(new BasicAWSCredentials(
        "accessKey", "secretKey"));
    byte[] contents = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
    InputStream stream = new ByteArrayInputStream(contents);
    ObjectMetadata meta = new ObjectMetadata();
    meta.setContentLength(contents.length);
    meta.setContentType("application/pdf");
    PutObjectResult res = client.putObject(bucket, fileName, stream, meta);
    client.setObjectAcl(bucket, fileName, CannedAccessControlList.PublicRead);

解决方案

I've looked the source code of AWS and debugged it and discovered the following:

• If MD5 is not provided it's calculated (works either for real files and InputStream)
• When the upload is finished md5 client side and server side are compared and if they differ an AmazonClientException is thrown. [line 1188 of AmazonS3Client 1.19]

In other words, to answer my own question, it's enough to listen for the exceptions because also the MD5 of the data uploaded is checked, so if there was a corruption an exception would be raised.

AmazonClientException and AmazonServiceException are unchecked exceptions, so it's important to remember to listen for them since the compiler won't force you to.

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