Question

我使用AWS S3构建webapp。

问题：如何从S3下载文件并将文件保存在用户下载文件夹中？

到目前为止我的代码：

this.getS3().getObject({Bucket:bucket_name, Key:keys},
      function(error, data) {
        if (error) {
          console.log("Error!")
        } else {
          // How to save 'data' file in Download folder?
        }
      });

Answer 1

这就是我在.NET中使用适用于.Net的AWS SDK的方式

public class AmazonS3
    {
        //Local varaibles to get the accesskey and secretkey
        private readonly string accessKey;
        private readonly string secretKey;
        private RegionEndpoint regionEndpoint;
        AmazonS3Client client = null;
        TransferUtility utility = null;

        /// <summary>
        /// Class Constructor for getting the accesskey and secretkey for the Amazon S3 bucket
        /// </summary>
        public AmazonS3Operations()
        {
            //get the accesskey and secretkey from the web.config

            accessKey = ConfigurationManager.AppSettings["AWSS3AccessKey"];
            secretKey = ConfigurationManager.AppSettings["AWSS3SecretKey"];
            regionEndpoint = RegionEndpoint.GetBySystemName(ConfigurationManager.AppSettings["AWSS3RegionEndPoint"]);

            //Initialize the connection here and use it every where in a singleton model
            client = GetS3ClientConnection();
        }

public byte[] GetFileObject(string filePath, string fileNameInS3, out string strContentType)
        {
            byte[] data = null;

            GetObjectRequest request = new GetObjectRequest();
            request.BucketName = filePath;
            request.Key = fileNameInS3;

            //get the object response here
            GetObjectResponse response = client.GetObject(request);
            using (MemoryStream ms = new MemoryStream())
            {
                response.ResponseStream.CopyTo(ms);
                data = ms.ToArray();
            }
            //get the Mimetype here                
            strContentType = MimeMapping.GetMimeMapping(fileNameInS3);
            return data;

        }

}

将您的参数传递给方法GetFileObject，方法将返回byte[]数组作为响应。在用户下载文件夹中创建具有相应名称和MIME类型的相应文件。

请参阅此处以了解与Java相同的内容：http://docs.aws.amazon.com/AmazonS3/latest/dev/RetrievingObjectUsingJava.html

其他语言也可以在线获取其他AWS文档。

下载S3文件

1 个答案: