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diff --git a/doc/radosgw/s3/java.rst b/doc/radosgw/s3/java.rst new file mode 100644 index 00000000..057c09c2 --- /dev/null +++ b/doc/radosgw/s3/java.rst @@ -0,0 +1,212 @@ +.. _java: + +Java S3 Examples +================ + +Setup +----- + +The following examples may require some or all of the following java +classes to be imported: + +.. code-block:: java + + import java.io.ByteArrayInputStream; + import java.io.File; + import java.util.List; + import com.amazonaws.auth.AWSCredentials; + import com.amazonaws.auth.BasicAWSCredentials; + import com.amazonaws.util.StringUtils; + import com.amazonaws.services.s3.AmazonS3; + import com.amazonaws.services.s3.AmazonS3Client; + import com.amazonaws.services.s3.model.Bucket; + import com.amazonaws.services.s3.model.CannedAccessControlList; + import com.amazonaws.services.s3.model.GeneratePresignedUrlRequest; + import com.amazonaws.services.s3.model.GetObjectRequest; + import com.amazonaws.services.s3.model.ObjectListing; + import com.amazonaws.services.s3.model.ObjectMetadata; + import com.amazonaws.services.s3.model.S3ObjectSummary; + + +If you are just testing the Ceph Object Storage services, consider +using HTTP protocol instead of HTTPS protocol. + +First, import the ``ClientConfiguration`` and ``Protocol`` classes. + +.. code-block:: java + + import com.amazonaws.ClientConfiguration; + import com.amazonaws.Protocol; + + +Then, define the client configuration, and add the client configuration +as an argument for the S3 client. + +.. code-block:: java + + AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey); + + ClientConfiguration clientConfig = new ClientConfiguration(); + clientConfig.setProtocol(Protocol.HTTP); + + AmazonS3 conn = new AmazonS3Client(credentials, clientConfig); + conn.setEndpoint("endpoint.com"); + + +Creating a Connection +--------------------- + +This creates a connection so that you can interact with the server. + +.. code-block:: java + + String accessKey = "insert your access key here!"; + String secretKey = "insert your secret key here!"; + + AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey); + AmazonS3 conn = new AmazonS3Client(credentials); + conn.setEndpoint("objects.dreamhost.com"); + + +Listing Owned Buckets +--------------------- + +This gets a list of Buckets that you own. +This also prints out the bucket name and creation date of each bucket. + +.. code-block:: java + + List<Bucket> buckets = conn.listBuckets(); + for (Bucket bucket : buckets) { + System.out.println(bucket.getName() + "\t" + + StringUtils.fromDate(bucket.getCreationDate())); + } + +The output will look something like this:: + + mahbuckat1 2011-04-21T18:05:39.000Z + mahbuckat2 2011-04-21T18:05:48.000Z + mahbuckat3 2011-04-21T18:07:18.000Z + + +Creating a Bucket +----------------- + +This creates a new bucket called ``my-new-bucket`` + +.. code-block:: java + + Bucket bucket = conn.createBucket("my-new-bucket"); + + +Listing a Bucket's Content +-------------------------- +This gets a list of objects in the bucket. +This also prints out each object's name, the file size, and last +modified date. + +.. code-block:: java + + ObjectListing objects = conn.listObjects(bucket.getName()); + do { + for (S3ObjectSummary objectSummary : objects.getObjectSummaries()) { + System.out.println(objectSummary.getKey() + "\t" + + objectSummary.getSize() + "\t" + + StringUtils.fromDate(objectSummary.getLastModified())); + } + objects = conn.listNextBatchOfObjects(objects); + } while (objects.isTruncated()); + +The output will look something like this:: + + myphoto1.jpg 251262 2011-08-08T21:35:48.000Z + myphoto2.jpg 262518 2011-08-08T21:38:01.000Z + + +Deleting a Bucket +----------------- + +.. note:: + The Bucket must be empty! Otherwise it won't work! + +.. code-block:: java + + conn.deleteBucket(bucket.getName()); + + +Forced Delete for Non-empty Buckets +----------------------------------- +.. attention:: + not available + + +Creating an Object +------------------ + +This creates a file ``hello.txt`` with the string ``"Hello World!"`` + +.. code-block:: java + + ByteArrayInputStream input = new ByteArrayInputStream("Hello World!".getBytes()); + conn.putObject(bucket.getName(), "hello.txt", input, new ObjectMetadata()); + + +Change an Object's ACL +---------------------- + +This makes the object ``hello.txt`` to be publicly readable, and +``secret_plans.txt`` to be private. + +.. code-block:: java + + conn.setObjectAcl(bucket.getName(), "hello.txt", CannedAccessControlList.PublicRead); + conn.setObjectAcl(bucket.getName(), "secret_plans.txt", CannedAccessControlList.Private); + + +Download an Object (to a file) +------------------------------ + +This downloads the object ``perl_poetry.pdf`` and saves it in +``/home/larry/documents`` + +.. code-block:: java + + conn.getObject( + new GetObjectRequest(bucket.getName(), "perl_poetry.pdf"), + new File("/home/larry/documents/perl_poetry.pdf") + ); + + +Delete an Object +---------------- + +This deletes the object ``goodbye.txt`` + +.. code-block:: java + + conn.deleteObject(bucket.getName(), "goodbye.txt"); + + +Generate Object Download URLs (signed and unsigned) +--------------------------------------------------- + +This generates an unsigned download URL for ``hello.txt``. This works +because we made ``hello.txt`` public by setting the ACL above. +This then generates a signed download URL for ``secret_plans.txt`` that +will work for 1 hour. Signed download URLs will work for the time +period even if the object is private (when the time period is up, the +URL will stop working). + +.. note:: + The java library does not have a method for generating unsigned + URLs, so the example below just generates a signed URL. + +.. code-block:: java + + GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucket.getName(), "secret_plans.txt"); + System.out.println(conn.generatePresignedUrl(request)); + +The output will look something like this:: + + https://my-bucket-name.objects.dreamhost.com/secret_plans.txt?Signature=XXXXXXXXXXXXXXXXXXXXXXXXXXX&Expires=1316027075&AWSAccessKeyId=XXXXXXXXXXXXXXXXXXX + |