使用iText7向现有的PDF添加标签、标题等

import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfOutline;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;

public class PdfTaggingExample {
    public static void main(String[] args) {
        try {
            // 打开现有的PDF文件
            PdfReader reader = new PdfReader("existing.pdf");
            PdfWriter writer = new PdfWriter("modified.pdf");
            PdfDocument document = new PdfDocument(reader, writer);

            // 创建标签和标题
            PdfOutline root = document.getOutlines(false);
            PdfOutline chapter1 = root.addOutline("Chapter 1");
            chapter1.addDestination(PdfDestination.makeDestination(new PdfString("chapter1")));
            PdfOutline section1 = chapter1.addOutline("Section 1");
            section1.addDestination(PdfDestination.makeDestination(new PdfString("section1")));

            // 保存修改后的PDF文件
            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}