AWS S3存储桶有1个pdf文件。这个pdf文件的内容需要使用iText Java库进行编辑。修改后的文件需要再次存储在S3存储桶中。目前,我们正在使用AWS Lambda函数。在目的地S3存储桶是越来越创建空的PDF文件与AWS CloudWatch的错误消息:“管道关闭”使用iText在AWS S3存储桶中编辑pdf文件
LAMBDA Java代码:
private String bucketName = "forms-storage";
public String getProposalPdf(InputRequest inputRequest, Context context) throws DocumentException, IOException{
final BasicAWSCredentials awsCreds = new BasicAWSCredentials(ConstantValues.AccessKey, ConstantValues.SecretKey);
final AmazonS3Client s3client = (AmazonS3Client) AmazonS3ClientBuilder.standard().withRegion(Regions.AP_SOUTH_1)
.withCredentials(new AWSStaticCredentialsProvider(awsCreds)).build();
S3Object object = s3client.getObject(new GetObjectRequest(bucketName, "forms/COMBO ver 1.1.pdf"));
InputStream objectData = object.getObjectContent();
PdfReader reader;
PdfStamper stamper = null;
BaseFont bf;
PipedOutputStream pdfBytes = new PipedOutputStream();
try {
reader = new PdfReader(objectData);
stamper = new PdfStamper(reader, pdfBytes);
bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
PdfContentByte over = stamper.getOverContent(1);
over.beginText();
over.setColorFill(BaseColor.BLACK);
over.setFontAndSize(bf, 12);
over.setTextMatrix(120,717);
over.showText("this is edited text");
over.endText();
PipedInputStream inputStream = new PipedInputStream(pdfBytes);
ObjectMetadata meta = new ObjectMetadata();
meta= object.getObjectMetadata();
meta.setContentLength(inputStream.available());
s3client.putObject(new PutObjectRequest(bucketName, "forms/123.pdf", inputStream, meta));
} catch (IOException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
}
finally
{
stamper.close();
objectData.close();
}
return "PDF Created";
}