Java 使用itext在AmazonS3上存储pdf文件

这是我第一次使用AmazonS3，我想存储我在JavaSpring中使用itext创建的pdf文件

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代码（托管在ec2实例上）创建了一个pdf，我想将其存储在某个地方。我正在探索AmazonS3是否可以保存这些文件。最后，我也想找回它。这可以使用itext和JavaSpring来完成吗？任何例子都很好

要将文件上载到Amazon s3，您需要使用AmazonS3Client类的

putObject

方法，如下所示：

    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));

  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();  

要从S3获取文件，您需要生成一个预签名URL以访问S3中的私有文件，或者如果您的文件是公共文件，则您可以通过点击浏览器中的文件链接直接访问您的文件，AWS S3控制台中将提供您文件的链接

此外，我们在上述上传代码中指定了

CannedAccessControlList.Private

，这意味着我们将文件权限设置为Private，因此我们需要生成预签名的URL来访问文件，如下所示：

    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));

  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();  

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要将文件上载到Amazon s3，您需要使用AmazonS3Client类的

putObject

方法，如下所示：

    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));

  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();  

要从S3获取文件，您需要生成一个预签名URL以访问S3中的私有文件，或者如果您的文件是公共文件，则您可以通过点击浏览器中的文件链接直接访问您的文件，AWS S3控制台中将提供您文件的链接

此外，我们在上述上传代码中指定了

CannedAccessControlList.Private

，这意味着我们将文件权限设置为Private，因此我们需要生成预签名的URL来访问文件，如下所示：

    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));

  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();  

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只需使用java，您就可以将文件移动到S3（谷歌？：）或者只需使用java，您就可以将文件移动到S3（谷歌？：）或者像个魔术师一样工作……）工作得很有魅力……）