将 AWS s3 文件读取为 Java 代码
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Read AWS s3 File to Java code
提问by Edamame
I tried to read a file from AWS s3 to my java code:
我试图从 AWS s3 读取文件到我的 java 代码：
File file = new File("s3n://mybucket/myfile.txt");
FileInputStream fileInput = new FileInputStream(file);
Then I got an error:
然后我得到一个错误：
java.io.FileNotFoundException: s3n:/mybucket/myfile.txt (No such file or directory) at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.(FileInputStream.java:146)
java.io.FileNotFoundException: s3n:/mybucket/myfile.txt (No such file or directory) at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.(FileInputStream.java:146)
Is there a way to open/read a file from AWS s3? Thanks a lot!
有没有办法从 AWS s3 打开/读取文件？非常感谢！
采纳答案by tedder42
The 'File' class from Java doesn't understand that S3 exists. Here's an example of reading a file from the AWS documentation:
Java 中的“文件”类不了解 S3 的存在。以下是从 AWS 文档中读取文件的示例：
AmazonS3 s3Client = new AmazonS3Client(new ProfileCredentialsProvider());
S3Object object = s3Client.getObject(new GetObjectRequest(bucketName, key));
InputStream objectData = object.getObjectContent();
// Process the objectData stream.
objectData.close();
回答by Enigo
In 2019 there's a bit more optimal way to read a file from S3:
在 2019 年，有一种更好的方法可以从 S3 读取文件：
private final AmazonS3 amazonS3Client = AmazonS3ClientBuilder.standard().build();
private Collection<String> loadFileFromS3() {
try (final S3Object s3Object = amazonS3Client.getObject(BUCKET_NAME,
FILE_NAME);
final InputStreamReader streamReader = new InputStreamReader(s3Object.getObjectContent(), StandardCharsets.UTF_8);
final BufferedReader reader = new BufferedReader(streamReader)) {
return reader.lines().collect(Collectors.toSet());
} catch (final IOException e) {
log.error(e.getMessage(), e)
return Collections.emptySet();
}
}
