From d48f72fd266fb9b6b48122a4b192140774475416 Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Sat, 22 Apr 2023 19:27:58 +0200
Subject: Change PDF form field font

Use iText to change the font of interactive form fields in a PDF.

Changes the font in 'f1040.pdf' to Courier.

This code is based on the following example from iText:
https://kb.itextsupport.com/home/it7kb/ebooks/itext-7-jump-start-tutorial-for-net/chapter-5-manipulating-an-existing-pdf-document-net#Chapter5:ManipulatinganexistingPDFdocument|.NET-Changingthepropertiesofformfields

For now I just downloaded the dependencies' JAR files and put them in a
'lib/' directory rather than have to learn how to use a dependency
management tool like Maven. Here is the contents of the 'lib/'
directory:

    barcodes-7.2.2.jar
    commons-7.2.2.jar
    font-asian-7.2.2.jar
    forms-7.2.2.jar
    hyph-7.2.2.jar
    io-7.2.2.jar
    kernel-7.2.2.jar
    layout-7.2.2.jar
    pdfa-7.2.2.jar
    pdftest-7.2.2.jar
    sign-7.2.2.jar
    slf4j-api-1.7.9.jar
    styled-xml-parser-7.2.2.jar
    svg-7.2.2.jar

To run this:

    $ make
    $ make run
---
 Main.java | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Main.java

(limited to 'Main.java')

diff --git a/Main.java b/Main.java
new file mode 100644
index 0000000..7ae3719
--- /dev/null
+++ b/Main.java
@@ -0,0 +1,29 @@
+import com.itextpdf.kernel.pdf.*;
+import com.itextpdf.kernel.font.*;
+import com.itextpdf.io.font.constants.StandardFonts;
+import com.itextpdf.forms.*;
+import com.itextpdf.forms.fields.*;
+
+import java.io.*;
+import java.util.Map;
+
+public class Main {
+	public static void main(String args[]) throws IOException {
+		PdfDocument pdf = new PdfDocument(
+			new PdfReader("f1040.pdf"),
+			new PdfWriter("f1040-courier.pdf")
+		);
+
+		PdfAcroForm form = PdfAcroForm.getAcroForm(pdf, false);
+
+		PdfFont courier = PdfFontFactory.createFont(StandardFonts.COURIER);
+		Map<String, PdfFormField> fields = form.getFormFields();
+
+		for (var entry : fields.entrySet()) {
+			PdfFormField field = entry.getValue();
+			field.setFont(courier);
+		}
+
+		pdf.close();
+	}
+}
-- 
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