您必须在代码中执行其他操作.我刚刚尝试使用1.9.6 S3 SDK的代码示例,该文件获取“text / html”内容类型.

以下是确切的(Groovy)代码：

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,md))

def object = s3.getObject(bucketName,keyName)

println(object.objectMetadata.contentType)

object.close()

}

}

程序打印

text/html

而S3元数据也是一样的：

以下是通过网络发送的通信(由Apache HTTP Commons调试日志提供)：

>> PUT /content-type-test HTTP/1.1

>> Host: raniz-playground.s3.amazonaws.com

>> Authorization: AWS

>> 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

>> 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

这也是source code显示我们的行为 – 如果您设置内容类型,SDK将不会覆盖它.