AWS-Amazon S3文档示例无法工作SignatureDoesNotMatch

Question

我正试图生成一个预先签名的URL，其中包含文档中可用的确切代码：

https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/examples-s3-presign.html

PutObjectRequest objectRequest = PutObjectRequest.builder()
                .bucket(bucketName)
                .key(keyName)
                .contentType("text/plain")
                .build();

        PutObjectPresignRequest presignRequest = PutObjectPresignRequest.builder()
                .signatureDuration(Duration.ofMinutes(10))
                .putObjectRequest(objectRequest)
                .build();

        PresignedPutObjectRequest presignedRequest = presigner.presignPutObject(presignRequest);


        String myURL = presignedRequest.url().toString();
        System.out.println("Presigned URL to upload a file to: " +myURL);
        System.out.println("Which HTTP method needs to be used when uploading a file: " +
                presignedRequest.httpRequest().method());

        // Upload content to the Amazon S3 bucket by using this URL
        URL url = presignedRequest.url();

        // Create the connection and use it to upload the new object by using the presigned URL
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setRequestProperty("Content-Type","text/plain");
        connection.setRequestMethod("PUT");
        OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());
        out.write("This text was uploaded as an object by using a presigned URL.");
        out.close();

        connection.getResponseCode();
        System.out.println("HTTP response code is " + connection.getResponseCode());

    } catch (S3Exception e) {
        e.getStackTrace();
    } catch (IOException e) {
        e.getStackTrace();
    }

但我有一个错误：

SignatureDoesNotMatch我们计算的请求签名与您提供的签名不匹配。检查您的密钥和签名方法。

知道文档代码为什么不起作用吗？这似乎与AWS签名V4有关。我不知道

Answer 1

我刚刚针对JavaV2代码示例测试了这个AWS SDK，它运行良好，并生成了一个预签名URL——如下所示，这是逐行调试代码的屏幕截图：

完整示例如下：

https://github.com/awsdocs/aws-doc-sdk-examples/blob/main/javav2/example_code/s3/src/main/java/com/example/s3/GeneratePresignedUrlAndUploadObject.java

您是否在这个Github位置使用了POM文件中显示的依赖项？

其他可能的问题可能是您将S3客户端对象设置到了错误的区域，或者出现了此处讨论的密钥名称问题——Amazon S3——如何修复“我们计算的请求签名与签名不匹配”错误？。