如何设置通过SDK一个S3对象的内容类型？ [英] How to set the content type of an S3 object via the SDK?

问题描述

我试图使用AWS API来设置多个对象的内容类型，并添加一个内容编码：gzip头给他们。这是我的code做的：

I'm trying to use AWS Api to set the content type of multiple objects and to add a 'content-encoding: gzip' header to them. Here's my code for doing that:

for (S3ObjectSummary summary : objs.getObjectSummaries() )
   {
       String key = summary.getKey();
       if (! key.endsWith(".gz"))
           continue;

       ObjectMetadata metadata = new ObjectMetadata();
       metadata.addUserMetadata("Content-Encoding", "gzip");
       metadata.addUserMetadata("Content-Type", "application/x-gzip");
       final CopyObjectRequest request = new CopyObjectRequest(bucket, key, bucket, key)
               .withSourceBucketName( bucket )
               .withSourceKey(key)
               .withNewObjectMetadata(metadata);

       s3.copyObject(request);
   }

当我运行这个然而，以下是结果：

When I run this however, the following is the result:

正如你所看到的，preFIX X-AMZ-元添加到我的自定义页眉和他们是低套管。而内容类型头被忽略，而是把 WWW /形式恩codeD 作为标题

As you can see, the prefix x-amz-meta was added to my custom headers, and they were lower cased. And the content-type header was ignored, instead it put www/form-encoded as the header.

我能做到这一点，以使其接受我的头值？

What can I do it to cause it to accept my header values?

推荐答案

发现问题。 ObjectMetadata 要求要设置的内容类型/编码明确，而不是通过 addUserMetadata（）。更改如下：

Found the problem. ObjectMetadata requires the content-type / encoding to be set explicitly rather than via addUserMetadata(). Changing the following:

   metadata.addUserMetadata("Content-Encoding", "gzip");
   metadata.addUserMetadata("Content-Type", "application/x-gzip");

到

       metadata.setContentEncoding("gzip");
       metadata.setContentType("application/x-gzip");

修正了这个。

fixed this.

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