java - 如何将图像直接上传到S3，而不让在Ec2中运行的java webapp来存储多部分图像？

Question

在我的笔记本电脑中，本地主机，

以下代码上传通过浏览器上传的图片，然后上传到S3。

我了解到 Elastic Beanstalk 应用程序在没有持久本地存储的 Amazon EC2 实例上运行。我们应该将文件直接写入S3。

当我的 java web 应用程序在 Ec2 实例中运行时，如何将文件直接写入 S3？

这是我用来将图像上传到 S3 的代码，它在我的本地主机中运行良好

try {
            final ObjectMetadata objectMetadata = new ObjectMetadata();
            objectMetadata.setContentType(file.getContentType());
            byte[] contentBytes = null;
            try {
              final InputStream is = file.getInputStream();
              contentBytes = IOUtils.toByteArray(is);
            } catch (final IOException e) {
              log.error("Failed while reading bytes from %s" + e.getMessage());
            }

            final Long contentLength = Long.valueOf(contentBytes.length);
            objectMetadata.setContentLength(contentLength);
            objectMetadata.setHeader("filename", fileNameWithExtn);

            /*
             * Reobtain the tmp uploaded file as input stream
             */
            final InputStream inputStream = file.getInputStream();

            final File convFile = new File(fileNameWithExtn);
            file.transferTo(convFile);


            FileUtils.copyInputStreamToFile(inputStream, convFile);
            try {

              final AmazonS3 s3Client = AmazonS3ClientBuilder.standard().build();
              versionId = s3Client.putObject(new PutObjectRequest("bucketName", name, convFile))
                  .getVersionId();
            } catch (final 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());
            } catch (final 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("Error Message: " + ace.getMessage());
            }
          } catch (final Exception e) {
            log.error("You failed to upload " + name + " => " + e.getMessage());
          }

我查了这篇文章Converting MultipartFile to java.io.File without copying to local machine但一个答案说它不适用于 File 或 String ，而其他答案没有明确的代码或答案。

请帮忙。

Answer 1

您可以尝试直接使用前端，查看S3文档关于直接提交html表单到s3检查链接以供引用将表单数据直接上传到 AWS S3 - 东西......还有东西......( https://stuff-things.net/2016/03/30/uploading-form-data-directly-to-aws-s3/ )使用 HTML5 和 Backbone.js 将图像文件从 Web 浏览器直接保存到 S3 ( http://www.tweetegy.com/2012/01/save-an-image-file-directly-to-s3-from-a-web-browser-using-html5-and-backbone-js/ )