[Solved] convert image inputstream to pdf inputstream – Java

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Introduction

This article will provide a step-by-step guide on how to convert an image inputstream to a PDF inputstream in Java. We will discuss the various methods available to achieve this conversion, as well as the advantages and disadvantages of each approach. We will also provide code snippets to help you get started. By the end of this article, you should have a better understanding of how to convert an image inputstream to a PDF inputstream in Java.

Solution

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;

public class ImageToPDF {

public static InputStream convertImageToPDF(InputStream imageInputStream) throws Exception {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Document document = new Document(PageSize.A4);
PdfWriter.getInstance(document, outputStream);
document.open();
Image image = Image.getInstance(imageInputStream);
float scaler = ((document.getPageSize().getWidth() – document.leftMargin()
– document.rightMargin() – 0) / image.getWidth()) * 100;
image.scalePercent(scaler);
image.setAlignment(Image.ALIGN_CENTER | Image.ALIGN_TOP);
document.add(image);
document.close();
return new ByteArrayInputStream(outputStream.toByteArray());
}
}


Some ideas may be useful instead of all the comments.. ?

At the risk of stating the obvious, do it in steps. For example …

  1. Use avax.imageio.ImageIO to create a java.awt.image.BufferedImage

  2. Wrap it as a com.itextpdf.text.Image

  3. Embed it in a com.itextpdf.text.PdfDocument

  4. Use com.itextpdf.text.DocumentWriter to write the com.itextpdf.text.PdfDocument to a java.io.ByteArrayOutputStream

  5. Get the byte[] and wrap it in a java.io.ByteArrayInputStream

It is theoretically possible to do the transformation without buffering the image in memory, but the existing APIs don’t support this. (You would have a lot of coding to do it in Java. It would be better to look for a standalone image-to-pdf conversion utility.)

You should be able to avoid the intermediate byte[] buffer using a PipedOutputStream / PipedInputStream pair.

2

solved convert image inputstream to pdf inputstream – Java


If you are looking for a way to convert an image inputstream to a PDF inputstream in Java, then you have come to the right place. In this article, we will discuss how to do this using the Apache PDFBox library. We will also discuss some of the advantages and disadvantages of using this library.

The Apache PDFBox library is an open-source Java library that can be used to create, manipulate, and extract data from PDF documents. It is a powerful library that can be used to create PDF documents from scratch, as well as to convert existing documents into PDF format. It also provides a number of features that make it easy to work with PDF documents, such as the ability to add text, images, and other elements to a PDF document.

To convert an image inputstream to a PDF inputstream in Java, we will need to use the PDFBox library. The first step is to create a PDF document from the image inputstream. This can be done using the PDDocument.load() method. This method takes an InputStream object as an argument and returns a PDDocument object. Once we have the PDDocument object, we can then use the PDDocument.save() method to save the document as a PDF file.

Once the PDF document has been created, we can then use the PDFBox library to convert the image inputstream to a PDF inputstream. This can be done using the PDFRenderer class. This class provides a number of methods that can be used to render a PDF document into an image. We can then use the PDFRenderer.render() method to render the PDF document into an image inputstream. Finally, we can use the PDFRenderer.write() method to write the image inputstream to a PDF inputstream.

Using the Apache PDFBox library to convert an image inputstream to a PDF inputstream in Java has a number of advantages. It is a powerful library that can be used to create PDF documents from scratch, as well as to convert existing documents into PDF format. It also provides a number of features that make it easy to work with PDF documents, such as the ability to add text, images, and other elements to a PDF document. Additionally, it is an open-source library, so it is free to use.

However, there are also some disadvantages to using the Apache PDFBox library. For example, it is not as user-friendly as some other libraries, and it can be difficult to debug errors. Additionally, it is not as fast as some other libraries, so it may take longer to convert an image inputstream to a PDF inputstream. Finally, it is not as feature-rich as some other libraries, so it may not be able to do all of the things that you need it to do.

In conclusion, the Apache PDFBox library can be used to convert an image inputstream to a PDF inputstream in Java. It is a powerful library that can be used to create PDF documents from scratch, as well as to convert existing documents into PDF format. However, it is not as user-friendly as some other libraries, and it can be difficult to debug errors. Additionally, it is not as fast as some other libraries, so it may take longer to convert an image inputstream to a PDF inputstream. Finally, it is not as feature-rich as some other libraries, so it may not be able to do all of the things that you need it to do.