테스트 코드 작성

pom.xml

        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-s3</artifactId>
            <version>1.11.91</version>
        </dependency>
        <dependency>
            <groupId>com.scireum</groupId>
            <artifactId>s3ninja</artifactId>
            <version>2.7</version>
        </dependency>

JUnit 코드

    static {
        //必要なフォルダを掘る
        try {
            Files.createDirectories(Paths.get("data/s3"));
        } catch (IOException e) {
        }

        //s3ninja起動
        Thread thread = new Thread(() -> {
            try {
                Method main = Class.forName("IPL").getMethod("main", new Class[] { String[].class });
                main.invoke(null, (Object) new String[0]);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        });
        thread.start();

        try {
            Thread.sleep(1000);//念のため
        } catch (InterruptedException e) {
        }

    }

    @Test
    public void test() throws IOException {
        AmazonS3 s3 = AmazonS3Client.builder()
                .withEndpointConfiguration(new EndpointConfiguration("http://localhost:9444/s3", null))
                .withCredentials(new AWSStaticCredentialsProvider(
                        new BasicAWSCredentials("AKIAIOSFODNN7EXAMPLE", "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY")))
                .withPathStyleAccessEnabled(true)
                .withClientConfiguration(new ClientConfiguration().withSignerOverride("S3SignerType"))
                .build();

        //アップロード
        s3.putObject(new PutObjectRequest("bucket", "s3test.txt", new File("test.txt")));

        //ダウンロード
        try (S3Object s3Object = s3.getObject(new GetObjectRequest("bucket", "s3test.txt"));
                InputStream input = s3Object.getObjectContent()) {
            assertThat(IOUtils.toByteArray(input), is(Files.readAllBytes(Paths.get("test.txt"))));
        }

    }

설명