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.. _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
|
