Using the AWS Java SDK for Multipart Upload (High-Level API)
The AWS SDK for Java exposes a high-level API that simplifies multipart upload (seeUploading Objects Using Multipart Upload API). You can upload data from a file or a stream. You can also set advanced options, such as the part size you want to use for the multipart upload, or the number of threads you want to use when uploading the parts concurrently. You can also set optional object properties, the storage class, or ACL. You use the PutObjectRequest and the TransferManagerConfiguration classes to set these advanced options. The TransferManager class of the Java API provides the high-level API for you to upload data.
When possible, TransferManager attempts to use multiple threads to upload multiple parts of a single upload at once. When dealing with large content sizes and high bandwidth, this can have a significant increase on throughput.
In addition to file upload functionality, the TransferManager class provides a method for you to abort multipart upload in progress. You must provide a Date value, and then the API aborts all the multipart uploads that were initiated before the specified date.
Upload a File
The following tasks guide you through using the high-level Java classes to upload a file. The API provides several variations, called overloads, of the upload method to easily upload your data.
High-Level API File Uploading Process
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1 |
Create an instance of the |
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2 |
Execute one of the |
The following Java code example demonstrates the preceding tasks.
Example
The following Java code example uploads a file to an Amazon S3 bucket. For instructions on how to create and test a working sample, see Testing the Java Code Examples.
import java.io.File; import com.amazonaws.AmazonClientException;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.services.s3.transfer.TransferManager;
import com.amazonaws.services.s3.transfer.Upload; public class UploadObjectMultipartUploadUsingHighLevelAPI { public static void main(String[] args) throws Exception {
String existingBucketName = "*** Provide existing bucket name ***";
String keyName = "*** Provide object key ***";
String filePath = "*** Path to and name of the file to upload ***"; TransferManager tm = new TransferManager(new ProfileCredentialsProvider());
System.out.println("Hello");
// TransferManager processes all transfers asynchronously,
// so this call will return immediately.
Upload upload = tm.upload(
existingBucketName, keyName, new File(filePath));
System.out.println("Hello2"); try {
// Or you can block and wait for the upload to finish
upload.waitForCompletion();
System.out.println("Upload complete.");
} catch (AmazonClientException amazonClientException) {
System.out.println("Unable to upload file, upload was aborted.");
amazonClientException.printStackTrace();
}
}
}
http://docs.aws.amazon.com/AmazonS3/latest/dev/HLuploadFileJava.html