为什么上传到S3文件有内容类型应用程序/八位字节流，除非我命名该文件的.html

问题描述

尽管我设置内容类型为text / html它结束了作为S3应用程序/八位字节流。

Even though I set content type to text/html it ends up as application/octet-stream on S3.

ByteArrayInputStream contentsAsStream = new ByteArrayInputStream(contentAsBytes);
ObjectMetadata md = new ObjectMetadata();
md.setContentLength(contentAsBytes.length);
md.setContentType("text/html");
s3.putObject(new PutObjectRequest(ARTIST_BUCKET_NAME, artistId, contentsAsStream, md));

如果这样，它最终以.html但我将文件命名为

If however I name the file so that it ends up with .html

s3.putObject(new PutObjectRequest(ARTIST_BUCKET_NAME, artistId + ".html", contentsAsStream, md));

然后它工作。

then it works.

是我的MD对象只是被忽视？我怎样才能克服这个编程随着时间的推移，我需要上传成千上万的文件，所以不能随便进入S3的用户界面和手动修复的contentType。

Is my md object just being ignored ? How can I get round this programmatically as over time I need to upload thousands of files so cannot just go into S3 UI and manually fix the contentType.

推荐答案

您必须做别的事情在你的code。我只是想用1.9.6 S3 SDK的code为例，该文件得到了text / html的内容类型。

You must be doing something else in your code. I just tried your code example using the 1.9.6 S3 SDK and the file gets the "text/html" content type.

下面是准确的（Groovy的）code：

Here's the exact (Groovy) code:

class S3Test {
    static void main(String[] args) {

        def s3 = new AmazonS3Client()

        def random = new Random()
        def bucketName = "raniz-playground"
        def keyName = "content-type-test"

        byte[] contentAsBytes = new byte[1024]
        random.nextBytes(contentAsBytes)

        ByteArrayInputStream contentsAsStream = new ByteArrayInputStream(contentAsBytes);
        ObjectMetadata md = new ObjectMetadata();
        md.setContentLength(contentAsBytes.length);
        md.setContentType("text/html");
        s3.putObject(new PutObjectRequest(bucketName, keyName, contentsAsStream, md))

        def object = s3.getObject(bucketName, keyName)
        println(object.objectMetadata.contentType)
        object.close()
    }
}

该程序打印

text / html的

和S3的元数据，说是相同的：

And the S3 metadata says the same:

下面是送过网的通信（礼貌的Apache HTTP共享调试日志记录）：

Here are the communication sent over the net (courtesy of Apache HTTP Commons debug logging):

>> PUT /content-type-test HTTP/1.1
>> Host: raniz-playground.s3.amazonaws.com
>> Authorization: AWS <nope>
>> User-Agent: aws-sdk-java/1.9.6 Linux/3.2.0-84-generic Java_HotSpot(TM)_64-Bit_Server_VM/25.45-b02/1.8.0_45
>> Date: Fri, 12 Jun 2015 02:11:16 GMT
>> Content-Type: text/html
>> Content-Length: 1024
>> Connection: Keep-Alive
>> Expect: 100-continue
<< HTTP/1.1 200 OK
<< x-amz-id-2: mOsmhYGkW+SxipF6S2+CnmiqOhwJ62WfWUkmZk4zU3rzkWCEH9P/bT1hUz27apmO
<< x-amz-request-id: 8706AE3BE8597644
<< Date: Fri, 12 Jun 2015 02:11:23 GMT
<< ETag: "6c53debeb28f1d12f7ad388b27c9036d"
<< Content-Length: 0
<< Server: AmazonS3

>> GET /content-type-test HTTP/1.1
>> Host: raniz-playground.s3.amazonaws.com
>> Authorization: AWS <nope>
>> User-Agent: aws-sdk-java/1.9.6 Linux/3.2.0-84-generic Java_HotSpot(TM)_64-Bit_Server_VM/25.45-b02/1.8.0_45
>> Date: Fri, 12 Jun 2015 02:11:23 GMT
>> Content-Type: application/x-www-form-urlencoded; charset=utf-8
>> Connection: Keep-Alive
<< HTTP/1.1 200 OK
<< x-amz-id-2: 9U1CQ8yIYBKYyadKi4syaAsr+7BV76Q+5UAGj2w1zDiPC2qZN0NzUCQNv6pWGu7n
<< x-amz-request-id: 6777433366DB6436
<< Date: Fri, 12 Jun 2015 02:11:24 GMT
<< Last-Modified: Fri, 12 Jun 2015 02:11:23 GMT
<< ETag: "6c53debeb28f1d12f7ad388b27c9036d"
<< Accept-Ranges: bytes
<< Content-Type: text/html
<< Content-Length: 1024
<< Server: AmazonS3

和这也是看来源$ C ​​$ C 向我们展示了 - 如果你设置内容类型的SDK将不会覆盖它。

And this is also the behaviour that looking at the source code shows us - if you set the content type the SDK won't override it.

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