使用itext在amazon s3上存储pdf文件

要将文件上载到Amazon s3,您需要使用 putObject AmazonS3Client类的方法如下:

    AWSCredentials credentials = new BasicAWSCredentials(appId,appSecret);
    AmazonS3 s3Client = new AmazonS3Client(credentials);

    String bucketPath = "YOUR_BUCKET_NAME/FOLDER_INSIDE_BUCKET";
    InputStream is = new FileInputStream("YOUR_PDF_FILE_PATH");
    ObjectMetadata meta = new ObjectMetadata();
    meta.setContentLength(is.available());
    s3Client.putObject(new PutObjectRequest(bucketPath,"YOUR_FILE.pdf", is, meta).withCannedAcl(CannedAccessControlList.Private));

要从S3获取文件,您需要生成一个预签名URL来访问S3中的私有文件,或者如果您的文件是公共文件,那么您可以通过点击浏览器中的文件链接直接访问您的文件,您的文件链接将在AWS S3控制台中可用。

我们还指定了 CannedAccessControlList.Private

  AWSCredentials credentials = new BasicAWSCredentials(appId,appSecret);
  AmazonS3 s3Client = new AmazonS3Client(credentials);

  GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest("YOUR_BUCKET_NAME", "FOLDER_INSIDE_BUCKET/YOUR_FILE.pdf");

  generatePresignedUrlRequest.setMethod(HttpMethod.GET); 

  Date expiration = new Date();
  long milliSeconds = expiration.getTime();
  milliSeconds += 1000 * 60 * 60; // Add 1 hour.
  expiration.setTime(milliSeconds);
  generatePresignedUrlRequest.setExpiration(expiration);
  URL url = s3Client.generatePresignedUrl(generatePresignedUrlRequest); 
  String finalUrl  = url.toString();