java - Amazon S3GeneratePresignedUrlRequest - 新文件

Question

我想将新文件上传到 Amazon s3 到我的测试存储桶。

这是java代码:

    AmazonS3 s3Client = new AmazonS3Client(new ProfileCredentialsProvider());
    java.util.Date expiration = new java.util.Date();
    long msec = expiration.getTime();
    msec += 1000 * 60 * 60; // Add 1 hour.
    expiration.setTime(msec);
    GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest("test-bucket", filename);
    generatePresignedUrlRequest.setMethod(HttpMethod.GET);
    generatePresignedUrlRequest.setExpiration(expiration);
    URL s = s3Client.generatePresignedUrl(generatePresignedUrlRequest);

但是我不断得到:

“指定的键不存在。”为文件名变量。

如何使此代码适用于新文件？

Answer 1

从外观上看，GeneratePresignedUrlRequest 适用于 S3 中的现有对象。

public GeneratePresignedUrlRequest(String bucketName, String key)

Creates a new request for generating a pre-signed URL that can be used as part of an HTTP GET request to access the Amazon S3 object stored under the specified key in the specified bucket.
Parameters:
bucketName - The name of the bucket containing the desired Amazon S3 object.
key - The key under which the desired Amazon S3 object is stored.

您可以使用 AmazonS3Client 类中的 putObject 方法之一。

PutObjectResult putObject(PutObjectRequest putObjectRequest)
Uploads a new object to the specified Amazon S3 bucket.

PutObjectResult putObject(String bucketName, String key, File file)
Uploads the specified file to Amazon S3 under the specified bucket and key name.

PutObjectResult putObject(String bucketName, String key, InputStream input, ObjectMetadata metadata)
Uploads the specified input stream and object metadata to Amazon S3 under the specified bucket and key name.

将对象放入 S3 后，您就可以使用 key 实例化GeneratePresignedUrlRequest 对象并获取 URL。