java - Replace text inside a PDF file using iText

Java - Replace text inside a PDF file using iText

To replace text inside a PDF file using iText in Java, you'll need to follow a series of steps to locate and modify the text elements within the PDF document. iText is a powerful library for PDF manipulation in Java. Here's a basic guide on how to achieve text replacement using iText:

Step-by-Step Implementation

1. Add iText Dependency

First, ensure you have added the iText dependency to your project. If you're using Maven, include the following dependency in your pom.xml:

<dependency> <groupId>com.itextpdf</groupId> <artifactId>itext7-core</artifactId> <version>7.1.15</version> <!-- Update version as needed --> </dependency>

2. Implement Text Replacement Logic

Here's a basic example of how to replace text in a PDF file using iText:

import com.itextpdf.kernel.pdf.PdfDocument; import com.itextpdf.kernel.pdf.PdfReader; import com.itextpdf.kernel.pdf.PdfWriter; import com.itextpdf.kernel.pdf.canvas.parser.PdfTextExtractor; import com.itextpdf.kernel.pdf.canvas.parser.listener.ITextExtractionStrategy; import com.itextpdf.kernel.pdf.canvas.parser.listener.LocationTextExtractionStrategy; import com.itextpdf.layout.Document; import com.itextpdf.layout.element.Paragraph; import java.io.File; import java.io.IOException; public class PdfTextReplacement { public static void main(String[] args) { String inputPdf = "input.pdf"; String outputPdf = "output.pdf"; String searchText = "Old Text"; // Text to be replaced String replaceText = "New Text"; // Text to replace with try { // Read input PDF PdfReader reader = new PdfReader(inputPdf); PdfDocument pdfDoc = new PdfDocument(reader); // Create output PDF PdfWriter writer = new PdfWriter(outputPdf); PdfDocument outputDoc = new PdfDocument(writer); Document document = new Document(outputDoc); // Iterate through each page int numPages = pdfDoc.getNumberOfPages(); for (int i = 1; i <= numPages; i++) { // Extract text from the page ITextExtractionStrategy strategy = new LocationTextExtractionStrategy(); String pageText = PdfTextExtractor.getTextFromPage(pdfDoc.getPage(i), strategy); // Replace text if found if (pageText.contains(searchText)) { pageText = pageText.replace(searchText, replaceText); } // Add modified text to the output PDF Paragraph para = new Paragraph(pageText); document.add(para); } // Close documents document.close(); outputDoc.close(); pdfDoc.close(); System.out.println("Text replaced successfully in PDF."); } catch (IOException e) { e.printStackTrace(); } } }

Explanation:

  • Dependencies: Ensure you have imported the necessary iText classes for PDF manipulation (PdfDocument, PdfReader, PdfWriter, etc.).

  • Text Replacement:

    • Search Text: Define the text you want to find and replace (searchText and replaceText variables).
    • Text Extraction: Use PdfTextExtractor with LocationTextExtractionStrategy to extract text from each page.
    • Replacement: Check if the extracted text contains the searchText and replace it with replaceText.

  • PDF Handling: Open both the input and output PDFs (PdfReader and PdfWriter), iterate through each page, modify the text if necessary, and write the modified content to the output PDF (Document).

Considerations:

  • Performance: Depending on the size of the PDF and the complexity of the text replacement, performance considerations may vary.

  • Text Formatting: This example treats the entire page text as a single paragraph. For more complex layouts or formatting, you may need to use more advanced strategies to preserve structure.

  • Error Handling: Implement robust error handling and ensure proper closing of resources (pdfDoc.close(), document.close(), etc.).

This example provides a foundational approach to replacing text in a PDF using iText in Java. Adjustments may be necessary based on specific PDF structures and requirements of your application.

Examples

  1. Java iText replace text in PDF example? Description: Replace specific text in a PDF document using iText library in Java.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(inputFile), new PdfWriter(outputFile)); PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true); form.getField(fieldName).setValue(newValue); pdfDoc.close();

  2. iText replace text in PDF template Java? Description: Replace placeholder text in a PDF template using iText in a Java application.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(templateFile), new PdfWriter(outputFile)); PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true); form.getField(fieldName).setValue(newValue); pdfDoc.close();

  3. Java iText find and replace text in PDF programmatically? Description: Programmatically search for and replace text in a PDF file using iText in Java.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(inputFile), new PdfWriter(outputFile)); PdfTextSearch ts = new PdfTextSearch(pdfDoc); List<PdfTextRegion> matches = ts.searchText("oldText"); for (PdfTextRegion match : matches) { match.setText("newText"); } pdfDoc.close();

  4. iText replace text in specific page of PDF Java example? Description: Replace text on a specific page of a PDF document using iText library in Java.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(inputFile), new PdfWriter(outputFile)); PdfPage page = pdfDoc.getPage(pageNumber); PdfCanvas canvas = new PdfCanvas(page); Rectangle rect = new Rectangle(x, y, width, height); canvas.rectangle(rect); canvas.stroke(); pdfDoc.close();

  5. Java iText replace text placeholder in PDF template? Description: Replace placeholder text in a PDF template using iText in Java with predefined coordinates.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(templateFile), new PdfWriter(outputFile)); PdfPage page = pdfDoc.getPage(pageNumber); PdfCanvas canvas = new PdfCanvas(page); Rectangle rect = new Rectangle(x, y, width, height); canvas.rectangle(rect); canvas.stroke(); pdfDoc.close();

  6. iText replace text in PDF with regular expression Java? Description: Replace text in a PDF file using regular expressions with iText in a Java application.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(inputFile), new PdfWriter(outputFile)); PdfTextSearch ts = new PdfTextSearch(pdfDoc); List<PdfTextRegion> matches = ts.searchTextPattern(Pattern.compile("regexPattern")); for (PdfTextRegion match : matches) { match.setText("replacementText"); } pdfDoc.close();

  7. Java iText PDF form fill example? Description: Fill form fields in a PDF document using iText library in Java.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(templateFile), new PdfWriter(outputFile)); PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true); form.getField(fieldName).setValue(fieldValue); pdfDoc.close();

  8. iText add text to existing PDF Java example? Description: Add text to an existing PDF document using iText library in Java without replacing existing content.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(inputFile), new PdfWriter(outputFile)); Document doc = new Document(pdfDoc); Paragraph para = new Paragraph("Additional text"); doc.add(para); doc.close();

  9. Java iText replace image in PDF example? Description: Replace an image in a PDF file using iText library in Java.

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(inputFile), new PdfWriter(outputFile)); PdfPage page = pdfDoc.getPage(pageNumber); PdfCanvas canvas = new PdfCanvas(page); Image img = new Image(ImageDataFactory.create(imageFile)); canvas.addImage(img, x, y, width, height); pdfDoc.close();

  10. iText replace text in encrypted PDF Java example? Description: Replace text in a password-protected or encrypted PDF document using iText in a Java application.

    PdfReader reader = new PdfReader(inputFile, new ReaderProperties().setPassword("password")); PdfDocument pdfDoc = new PdfDocument(reader, new PdfWriter(outputFile)); PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true); form.getField(fieldName).setValue(newValue); pdfDoc.close();

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