AWS S3 Java SDK - 下载文件帮助

Question

下面的代码仅适用于从 S3 中的存储桶下载文本文件。这不适用于图像。使用 AWS 开发工具包是否有更简单的方法来管理下载/类型？文档中包含的示例并不明显。谢谢！

 AWSCredentials myCredentials = new BasicAWSCredentials(
       String.valueOf(Constants.act), String.valueOf(Constants.sk));
AmazonS3Client s3Client = new AmazonS3Client(myCredentials);
S3Object object = s3Client.getObject(new GetObjectRequest("bucket", "file"));

BufferedReader reader = new BufferedReader(new InputStreamReader(
       object.getObjectContent()));
File file = new File("localFilename");
Writer writer = new OutputStreamWriter(new FileOutputStream(file));

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

     writer.write(line + "\n");
}

writer.close();

原文由 user375566 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

代替 Reader OutputStream InputStream Writer

 InputStream reader = new BufferedInputStream(
   object.getObjectContent());
File file = new File("localFilename");
OutputStream writer = new BufferedOutputStream(new FileOutputStream(file));

int read = -1;

while ( ( read = reader.read() ) != -1 ) {
    writer.write(read);
}

writer.flush();
writer.close();
reader.close();

原文由 Maurício Linhares 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 2

虽然 Mauricio 的答案中编写的代码可以工作——而且他关于流的观点当然是正确的——亚马逊提供了一种更快的方法来将文件保存在他们的 SDK 中。我不知道它在 2011 年是否不可用，但现在可用。

 AmazonS3Client s3Client = new AmazonS3Client(myCredentials);

File localFile = new File("localFilename");

ObjectMetadata object = s3Client.getObject(new GetObjectRequest("bucket", "s3FileName"), localFile);

原文由 Eyal 发布，翻译遵循 CC BY-SA 4.0 许可协议