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JPG to PDF in Java

Problem:

Scanned document stored as series of jpeg images and I needed a PDF. There are ways to accomplish this without code (print to PDF), but I needed to make the file a particular size and print to pdf made the single PDF larger than the combined size of the images.

Solution:

iText PDF library and Java program to create a PDF with the images. See more about iText here: http://developers.itextpdf.com/itext-java

See the code in Main.java. It started with a piece of code from nathan on stackoverflow with modifications to resize the image and to add multiple images (1 per page). See: http://stackoverflow.com/questions/15744454/how-to-convert-jpg-to-pdf-in-android-java

Maven dependency:

  <dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.9</version>
  </dependency>

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import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
public class JpgToPdf {
public static void main(String arg[]) throws Exception {
File root = new File("<folder containing images>");
String outputFile = "output.pdf";
List<String> files = new ArrayList<String>();
files.add("page1.jpg");
files.add("page2.jpg");
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(new File(root, outputFile)));
document.open();
for (String f : files) {
document.newPage();
Image image = Image.getInstance(new File(root, f).getAbsolutePath());
image.setAbsolutePosition(0, 0);
image.setBorderWidth(0);
image.scaleAbsolute(PageSize.A4);
document.add(image);
}
document.close();
}
}
@geckoway

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geckoway commented Apr 25, 2019

image file : https://drugdoc.ysbang.cn/1642/11210020_f4f28633-7678-4278-89a7-4b7bbc3b7887.jpg
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
at com.itextpdf.text.Jpeg.processParameters(Jpeg.java:290)
at com.itextpdf.text.Jpeg.(Jpeg.java:117)

@lfo

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lfo commented May 10, 2019

It is exactly what I was looking for. It was a time saver.

Thanks.

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