ดึงข้อมูลจากรูปแบบ PDF ผ่าน Java

// Open document
String inputFile = DATA_DIR.resolve("sample.pdf").toString();
try (Document pdfDocument = new Document(inputFile)) {

    // Get values from all fields
    for (WidgetAnnotation field : pdfDocument.getForm()) {
        // Cast to FormField
        Field formField = (Field) field;
        // Analyze names and values if needed
        System.out.println("Field Name : " + formField.getPartialName());
        System.out.println("Value : " + formField.getValue());
    }
}