AWS Lambda Java，写入 S3 存储桶

Question

我正在创建一个每月运行的 AWS Lambda 函数。 每个月都会处理一些数据并将其写回 S3 Bucket。

您知道如何将 AWS Lambda Java 中的文件写入 S3 存储桶吗？

Answer 1

是的，您必须在 S3 存储桶中创建一个文本文件并参考以下代码来根据您的要求更新文件内容。

AmazonS3 client = new AmazonS3Client();
/**
 * @param bucketName
 *            The name of the bucket to place the new object in.
 * @param key
 *            The key of the object to create.
 * @param content
 *            The String to encode
 */
client.putObject("**Bucket Name**", "**File Name to write**", "updated string contents");

Answer 2

与您可以从任何 Java 应用程序将文件写入 S3 的方式相同。 使用适用于 Java的AWS 开发工具包。

Answer 3

我建议使用AWS Kinesis FireHose服务，该服务允许将数据作为字符串从AWS SDK 发送。 该服务将为您编写文件、聚合事件，甚至使用时间戳压缩文件。

Answer 4

试试这个：

try{
            // Create new file
            Util._logger.log(" Creating file transfer ");

            StringBuilder stringBuilder = new StringBuilder();

            //Writing in file
            stringBuilder.append('Data you want to write in file');

            // Upload file
            ByteArrayInputStream inputStream = new ByteArrayInputStream(stringBuilder.toString().getBytes(Constants.UTF_8));
            s3Client.putObject(dstBucket, uploadFileName, inputStream, new ObjectMetadata());

        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 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());
            Util._logger.log(Constants.EXCEPTION_ERROR + ase.getMessage());
            ase.printStackTrace();
        } 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(Constants.EXCEPTION_ERROR + ace.getMessage());
                Util._logger.log(Constants.EXCEPTION_ERROR + ace.getMessage());
                ace.printStackTrace();
        } catch (Exception e) {
                Util._logger.log(Constants.EXCEPTION_ERROR + e.getMessage());
                e.printStackTrace();
        }

Answer 5

这是来自官方 Git 存储库的示例

https://github.com/awsdocs/aws-lambda-developer-guide/blob/master/sample-apps/s3-java/src/main/java/example/Handler.java