小编Bar*_*rsk的帖子

我正在尝试用Java编写一个用于AWS Lambda函数的字节流客户端.我已经创建了Lambda函数作为RequestStreamHandler的实现.该项目的基础是在文档中概述这里.

public class LambdaFunctionHandler implements RequestStreamHandler {
    static final String bucket = "anS3bucket";
    static final String key = "anS3KeyToAJpegFile";

    @Override
    public void  handleRequest(InputStream input, OutputStream output, 
            Context context) throws IOException {

        AmazonS3 s3Client = new AmazonS3Client(
                new EnvironmentVariableCredentialsProvider());
        try {
            context.getLogger().log("Downloading an object\n");
            S3Object s3object = s3Client.getObject(new GetObjectRequest(
                    bucket, key));
            context.getLogger().log("Content-Type: "  + 
                    s3object.getObjectMetadata().getContentType() 
                       + "\n");
            InputStream in = s3object.getObjectContent();
            int b = 0;
            context.getLogger().log("Writing jpeg on output\n");
            while ((b = in.read()) > -1) {
                output.write(b);
            } …