sys2202.aws.s3.Sample.java Source code

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Here is the source code for sys2202.aws.s3.Sample.java

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/*
 * Copyright 2010-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package sys2202.aws.s3;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.Bucket;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.ListObjectsRequest;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.s3.model.S3ObjectSummary;

/**
 * This sample demonstrates how to make basic requests to Amazon S3 using the
 * AWS SDK for Java.
 * <p>
 * <b>Prerequisites:</b> You must have a valid Amazon Web Services developer
 * account, and be signed up to use Amazon S3. For more information on Amazon
 * S3, see http://aws.amazon.com/s3.
 * <p>
 * Fill in your AWS access credentials in the provided credentials file
 * template, and be sure to move the file to the default location
 * (~/.aws/credentials) where the sample code will load the credentials from.
 * <p>
 * <b>WARNING:</b> To avoid accidental leakage of your credentials, DO NOT keep
 * the credentials file in your source directory.
 *
 * http://aws.amazon.com/security-credentials
 */
public class Sample {

    public static void main(String[] args) throws Exception {

        // create the client we'll use to connect to S3
        AmazonS3 s3 = AmazonS3ClientBuilder.standard().withRegion(Regions.US_EAST_1).build();

        // list buckets in our S3 account
        System.out.println("Listing buckets in our S3 account...\n");
        for (Bucket bucket : s3.listBuckets()) {
            System.out.println("\t" + bucket.getName());
        }

        System.out.println();

        // create a new bucket to experiment with
        String bucketName = "msg8u-sys2202-bucket"; // set the bucket name -- this must be unique, so you'll want to use your ID instead of msg8u
        System.out.println("Creating bucket " + bucketName + "...\n");
        s3.createBucket(bucketName);

        // list buckets in our S3 account
        System.out.println("Listing buckets in our S3 account...\n");
        for (Bucket bucket : s3.listBuckets()) {
            System.out.println("\t" + bucket.getName());
        }

        System.out.println();

        // create and upload a sample file
        System.out.println("Uploading a new object to S3 from a local file...\n");
        File sampleFile = createSampleFile();
        String objectKey = "my-test-file";
        PutObjectRequest putRequest = new PutObjectRequest(bucketName, objectKey, sampleFile);
        s3.putObject(putRequest);

        // list objects in our new bucket -- notice the new object is now present
        System.out.println("Listing objects in our new bucket...\n");
        ListObjectsRequest listRequest = new ListObjectsRequest().withBucketName(bucketName);
        ObjectListing objectListing = s3.listObjects(listRequest);
        for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) {
            System.out.println("\t" + objectSummary.getKey() + "  " + "(size = " + objectSummary.getSize() + ")");
        }

        System.out.println();

        // download and display the sample file that we just uploaded
        System.out.println("Downloading the sample file...\n");
        GetObjectRequest getRequest = new GetObjectRequest(bucketName, objectKey);
        S3Object object = s3.getObject(getRequest);
        displayTextInputStream(object.getObjectContent());

        // delete the sample file from S3
        System.out.println("Deleting the sample file...\n");
        s3.deleteObject(bucketName, objectKey);

        // delete the bucket
        System.out.println("Deleting the bucket...\n");
        s3.deleteBucket(bucketName);

        System.out.println("All done!");
    }

    /**
     * Creates a temporary file with text data to demonstrate uploading a file
     * to Amazon S3
     *
     * @return A newly created temporary file with text data.
     *
     * @throws IOException
     */
    private static File createSampleFile() throws IOException {

        File file = File.createTempFile("test", ".txt");
        file.deleteOnExit();

        Writer writer = new OutputStreamWriter(new FileOutputStream(file));
        writer.write("This is a test file.");
        writer.close();

        return file;
    }

    /**
     * Displays the contents of the specified input stream as text.
     *
     * @param input
     *            The input stream to display as text.
     *
     * @throws IOException
     */
    private static void displayTextInputStream(InputStream input) throws IOException {

        BufferedReader reader = new BufferedReader(new InputStreamReader(input));

        while (true) {

            String line = reader.readLine();
            if (line == null) {
                break;
            }

            System.out.println("\t" + line);
        }

        System.out.println();
    }
}