How to convert a PDF to byte array in Java?

You can read data from a PDF file using the read() method of the FileInputStream class this method requires a byte array as a parameter.

Example

import java.io.File;
import java.io.FileInputStream;
import java.io.ByteArrayOutputStream;

public class PdfToByteArray {
   public static void main(String args[]) throws Exception {
      File file = new File("sample.pdf");
      FileInputStream fis = new FileInputStream(file);
      byte [] data = new byte[(int)file.length()];
      fis.read(data);
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      data = bos.toByteArray();
   }
}

Sample.pdf