Question

我正在尝试使用spring mvc rest api将文件上传到aws-s3存储桶。这是我访问s3存储桶的凭据格式

[default]
aws_access_key_id = Access key id
aws_secret_access_key = secret access key

这是我的Java代码：

@RestController
public class UploadController {

private static String bucketName= "mp4-upload-1";
private static String keyName= "secret access key";
public static final Logger logger=LogManager.getLogger(UploadController.class);

@RequestMapping(value="/uploadVideo", method = RequestMethod.POST, consumes=MediaType.MULTIPART_FORM_DATA_VALUE)
public ResponseEntity<String> uploadVideo(@RequestParam("file") MultipartFile file) throws IOException {


    AmazonS3 s3client = new AmazonS3Client(new ProfileCredentialsProvider());
    try {
        System.out.println("Uploading a new object to S3 from a file\n");

        InputStream is=file.getInputStream();

        s3client.putObject(new PutObjectRequest(bucketName, keyName,is,new ObjectMetadata()).withCannedAcl(CannedAccessControlList.PublicRead));


    } catch (AmazonServiceException ase) {
        System.out.println("Caught an AmazonServiceException, which " +
                "means your request made it " +
                "to Amazon S3, but was rejected with an error response" +
                " for some reason.");
        System.out.println("Error Message:    " + ase.getMessage());
        System.out.println("HTTP Status Code: " + ase.getStatusCode());
        System.out.println("AWS Error Code:   " + ase.getErrorCode());
        System.out.println("Error Type:       " + ase.getErrorType());
        System.out.println("Request ID:       " + ase.getRequestId());
    } catch (AmazonClientException ace) {
        System.out.println("Caught an AmazonClientException, which " +
                "means the client encountered " +
                "an internal error while trying to " +
                "communicate with S3, " +
                "such as not being able to access the network.");
        System.out.println("Error Message: " + ace.getMessage());
    }
    return new ResponseEntity<>(HttpStatus.OK);

}

}

问题是我没有收到任何错误，但文件没有上传到s3-bucket。我在这里错过了什么吗？提前致谢

Answer 1

当流直接上传到S3时，应在请求中指定内容长度。

ObjectMetadata objMetadata = new ObjectMetadata()
objMetadata.setContentLength(20L);

直接从输入流上传时，内容长度必须为在将数据上传到Amazon S3之前指定。如果没有提供，库必须缓冲输入流的内容为了计算它。 Amazon S3明确要求提供内容在发送任何数据之前，请在请求标头中发送长度。

Refer this for content length calculation

替代方法： -

使用org.springframework.util.FileCopyUtils.copyToByteArray()将流转换为byte[]并将字节数组上传到S3。

文件未上传到s3存储桶

1 个答案: