Java Requires Chilkat v11.7.0+

Replace the Value After a Label in a PDF (Re-issue an Invoice)

See more PDF Text Replacement Examples

Demonstrates replacing the values that follow labels such as "Invoice Number:" on a PDF that has no placeholders -- an ordinary invoice. Each entry of the "labels" array names a label as it appears on the page and the new value; the value replaces the rest of the label's line. Label matching ignores case, extra spaces and a trailing colon. The replaced text is read back with ExtractText to confirm it. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  The PDF used in this example is available at invoice_labels.pdf

    CkPdf pdf = new CkPdf();
    success = pdf.LoadFile("qa_data/pdf/invoice_labels.pdf");
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    //  The invoice has lines such as "Invoice Number:   INV-2026-0412" and "Total Due:  $1,234.53".
    //  Each label's new value replaces whatever follows the label on its line.
    CkJsonObject json = new CkJsonObject();
    json.UpdateString("labels[0].label","Invoice Number:");
    json.UpdateString("labels[0].value","INV-2026-0500");
    json.UpdateString("labels[1].label","Invoice Date:");
    json.UpdateString("labels[1].value","April 2, 2026");
    json.UpdateString("labels[2].label","customer");
    json.UpdateString("labels[2].value","Contoso Ltd");
    json.UpdateString("labels[3].label","Total Due:");
    json.UpdateString("labels[3].value","$1,999.99");

    CkJsonObject jsonOut = new CkJsonObject();
    success = pdf.TextReplace("apply",json,jsonOut);
    if (success == false) {
        System.out.println("Not applied: " + jsonOut.emit());
        if (success == false) {
            System.out.println(pdf.lastErrorText());
            return;
            }

        }

    int i = 0;
    int count_i = jsonOut.SizeOfArray("replacements");
    while (i < count_i) {
        jsonOut.put_I(i);
        System.out.println("Replaced the value of \"" + jsonOut.stringOf("replacements[i].label") + "\" on page " + jsonOut.stringOf("replacements[i].pages"));
        i = i+1;
        }

    success = pdf.WriteFile("qa_output/invoice_reissued.pdf");
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    //  Read the new values back with ExtractText's label option.
    CkJsonObject jsonRead = new CkJsonObject();
    CkJsonObject jsonText = new CkJsonObject();
    jsonRead.UpdateString("label","Total Due");
    jsonRead.UpdateString("labelValue","right");
    success = pdf.ExtractText("text",jsonRead,jsonText);
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    System.out.println("Total Due is now: " + jsonText.stringOf("text"));

    //  Sample output:

    //  Replaced the value of "Invoice Number:" on page 1
    //  Replaced the value of "Invoice Date:" on page 1
    //  Replaced the value of "customer" on page 1
    //  Replaced the value of "Total Due:" on page 1
    //  Total Due is now: $1,999.99
  }
}