AWSのS3へJavaのSDKを使用してアップロード

AWSへプログラムよりアクセスする

なんかやることが多くなってきた

準備

AWSのIAMでS3用のユーザーを作成し、アクセスキーとシークレットアクセスキーを取得

eclipseへ機能を追加

新規ソフトウェアのインストールで「https://aws.amazon.com/eclipse」を設定

アクセスキーとシークレットアクセスキーを設定する

設定を変更して東京リージョンへする

eclipse

プロジェクトで「AWS Java Project」で作成

Amazon S3 Sample

サンプル

package com.example.awssample;

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 java.util.UUID;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
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.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;

public class S3Sample {

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

        // eclipseの設定ファイルのパスよりアクセスキー、シークレットアクセスキーを参照
        AWSCredentials credentials = null;
        try {
            credentials = new ProfileCredentialsProvider("default").getCredentials();
        } catch (Exception e) {
            throw new AmazonClientException(
                    "Cannot load the credentials from the credential profiles file. " +
                    "Please make sure that your credentials file is at the correct " +
                    e);
        }

        AmazonS3 s3 = new AmazonS3Client(credentials);
        Region usWest2 = Region.getRegion(Regions.AP_NORTHEAST_1);
        s3.setRegion(usWest2);

        String bucketName = "awsuploadsample";
        String key = UUID.randomUUID().toString();

        System.out.println("===========================================");
        System.out.println("Getting Started with Amazon S3");
        System.out.println("===========================================\n");

        try {
            // バケット名
            System.out.println("Creating bucket " + bucketName + "\n");
            
            // バケット一覧
            System.out.println("Listing buckets");
            for (Bucket bucket : s3.listBuckets()) {
                System.out.println(" - " + bucket.getName());
            }
            System.out.println();

            // ファイルアップロード
            System.out.println("Uploading a new object to S3 from a file\n");
            s3.putObject(new PutObjectRequest(bucketName, key, createSampleFile()));

            // ・ダウンロード
            System.out.println("Downloading an object");
            S3Object object = s3.getObject(new GetObjectRequest(bucketName, key));
            System.out.println("Content-Type: "  + object.getObjectMetadata().getContentType());
            displayTextInputStream(object.getObjectContent());

            // 一覧を表示
            System.out.println("Listing objects");
            ObjectListing objectListing = s3.listObjects(new ListObjectsRequest()
                    .withBucketName(bucketName)
                    .withPrefix("My"));
            for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) {
                System.out.println(" - " + objectSummary.getKey() + "  " +
                                   "(size = " + objectSummary.getSize() + ")");
            }
            System.out.println();

            // アップロードファイルの削除
            //System.out.println("Deleting an object\n");
            //s3.deleteObject(bucketName, key);
            
        } catch (AmazonServiceException ase) {
            System.out.println("Caught an AmazonServiceException, which means your request made it "
                    + "to Amazon S3, but was rejected with an error response for some reason.");
            System.out.println("Error Message:    " + ase.getMessage());
            System.out.println("HTTP Status Code: " + ase.getStatusCode());
            System.out.println("AWS Error Code:   " + ase.getErrorCode());
            System.out.println("Error Type:       " + ase.getErrorType());
            System.out.println("Request ID:       " + ase.getRequestId());
        } catch (AmazonClientException ace) {
            System.out.println("Caught an AmazonClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with S3, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message: " + ace.getMessage());
        }
    }

    /**
     * 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("aws-java-sdk-", ".txt");
        file.deleteOnExit();

        Writer writer = new OutputStreamWriter(new FileOutputStream(file));
        writer.write("abcdefghijklmnopqrstuvwxyz\n");
        writer.write("01234567890112345678901234\n");
        writer.write("!@#$%^&*()-=[]{};':',.<>/?\n");
        writer.write("01234567890112345678901234\n");
        writer.write("abcdefghijklmnopqrstuvwxyz\n");
        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("    " + line);
        }
        System.out.println();
    }

}

結果

参考

EclipseでAWS Toolkitを使う - Qiita
[AWS SDK for Java] S3からファイルをダウンロードするアプリケーションの作成 ｜ Developers.IO
覚え書き: AWS SDK for JAVA -S3 アップロード編-