Upload and download notes in java on S3

Introduction

It is a memo of uploading and downloading from java to S3. In the case of proxy environment, if proxy is not set, it will time out. Other than that, it was made with the official sample.

I would like to investigate the details and add them.

Introducing jar (maven)

pom.xml

    <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-s3</artifactId>
            <version>1.11.112</version>
    </dependency>

Declaration of constants

java

	static final String S3_ACCESS_KEY			= "";
	static final String S3_SECRET_KEY			= "";
	static final String S3_SERVICE_END_POINT	= "";
	static final String S3_REGION				= "";
	static final String S3_BUCKET_NAME			= "";

Authentication process

java

    //Authentication process
    private static AmazonS3 auth(){
    	System.out.println("auth start");

    	//AWS credentials
    	AWSCredentials credentials = new BasicAWSCredentials(S3_ACCESS_KEY, S3_SECRET_KEY);

    	//Client settings
    	ClientConfiguration clientConfig = new ClientConfiguration();
    	clientConfig.setProxyHost("[proxyHost]");
    	clientConfig.setProxyPort([portNo]);

    	//Endpoint setting
    	EndpointConfiguration endpointConfiguration = new EndpointConfiguration(S3_SERVICE_END_POINT,  S3_REGION);

    	//Generate S3 access client
    	AmazonS3 client = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(credentials))
    			.withClientConfiguration(clientConfig)
    			.withEndpointConfiguration(endpointConfiguration).build();

    	System.out.println("auth end");
    	return client;
    }

Upload process

java

    //Upload processing
    private static void upload() throws Exception{
    	System.out.println("upload start");

        //Authentication process
    	AmazonS3 client = auth();

    	File file = new File("[Upload file path]");
    	FileInputStream fis = new FileInputStream(file);


    	ObjectMetadata om = new ObjectMetadata();
    	om.setContentLength(file.length());

    	final PutObjectRequest putRequest = new PutObjectRequest(S3_BUCKET_NAME, file.getName(), fis, om);

    	//Permission settings
    	putRequest.setCannedAcl(CannedAccessControlList.PublicRead);

    	//upload
    	client.putObject(putRequest);

    	fis.close();

    	System.out.println("upload end");
    }

Download process

java

    //Download processing
    private static void download() throws Exception{
    	System.out.println("download start");

        //Authentication process
    	AmazonS3 client = auth();

    	final GetObjectRequest getRequest = new GetObjectRequest(S3_BUCKET_NAME, "[Download file name");

    	S3Object object = client.getObject(getRequest);

    	FileOutputStream fos = new FileOutputStream(new File("[Output destination path]"));
    	IOUtils.copy(object.getObjectContent(), fos);

    	fos.close();

    	System.out.println("download end");
    }