AmazonS3にjavaSDKを用いて文字列を書き込む

ポイントは２回InputStreamを作成することです。

http://stackoverflow.com/questions/8351886/amazons3-putobject-with-inputstream-length-example

package awssample;

import java.io.ByteArrayInputStream;

import java.io.InputStream;

import java.sql.SQLException;

import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.util.IOUtils;

public class S3Write {

	private static String endpoint = "https://s3-ap-northeast-1.amazonaws.com";

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

		String s = "2011-01-01,9999,1,100,1.0,-1.0,0.5";
		// 認証オブジェクトを作成
		String accessKey = "xxxxxx";
		String accessSecretKey = "xxxxxxxx";
		AWSCredentials credentials = new BasicAWSCredentials(accessKey, accessSecretKey);

		// ConfigurationでTimeout時間を30秒に設定
		ClientConfiguration clientConfiguration = new ClientConfiguration();
		clientConfiguration.setConnectionTimeout(30000);

		// AmazonS3Clientをインスタンス化
		AmazonS3Client s3 = new AmazonS3Client(credentials, clientConfiguration);
		s3.setEndpoint(endpoint);
		try {
			InputStream is = new ByteArrayInputStream(s.getBytes("UTF-8"));
			byte[] contentBytes = IOUtils.toByteArray(is);
			Long contentLength = Long.valueOf(contentBytes.length);
			System.out.println("contentLength=" + contentLength + ",s=" + s);

			ObjectMetadata metadata = new ObjectMetadata();
			metadata.setContentLength(contentLength);
											 // isではなく new ByteStreamInputStreamでもう一度さくせいしたものを渡す
			s3.putObject(new PutObjectRequest("bucketname", "path/to/file.txt",
					new ByteArrayInputStream(s.getBytes("UTF-8")), metadata));

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}