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. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Pdf;

public class ChilkatExample {

    public static void main(String[] args) {
        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

        Pdf pdf = new Pdf();
        try {
            pdf.loadFile("qa_data/pdf/invoice_labels.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            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.
        JsonObject json = new JsonObject();
        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");

        JsonObject jsonOut = new JsonObject();
        try {
            pdf.textReplace("apply", json, jsonOut);
            success = true;
        } catch (ChilkatException e) {
            success = false;
        }
        if (!success) {
            System.out.println("Not applied: " + jsonOut.emit());
            if (!success) {
                System.out.println(pdf.getLastErrorText());
                return;
            }
        }

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

        try {
            pdf.writeFile("qa_output/invoice_reissued.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Read the new values back with ExtractText's label option.
        JsonObject jsonRead = new JsonObject();
        JsonObject jsonText = new JsonObject();
        jsonRead.updateString("label", "Total Due");
        jsonRead.updateString("labelValue", "right");
        try {
            pdf.extractText("text", jsonRead, jsonText);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            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
    }
}