删除每页第一行中的FixedLeading itext 7

import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;

public class RemoveFixedLeadingExample {
    public static void main(String[] args) {
        try {
            PdfReader reader = new PdfReader("input.pdf");
            PdfWriter writer = new PdfWriter("output.pdf");
            PdfDocument document = new PdfDocument(reader, writer);

            int totalPages = document.getNumberOfPages();

            for (int i = 1; i <= totalPages; i++) {
                PdfPage page = document.getPage(i);
                Document doc = new Document(document, page.getPageSize());

                // 移除第一行的行间距
                doc.setFixedLeading(0);

                // 添加内容到新的文档中
                Paragraph paragraph = new Paragraph();
                paragraph.add(page.getContentStream());
                doc.add(paragraph);

                doc.close();
            }

            document.close();
            reader.close();

            System.out.println("删除每页第一行中的 FixedLeading 完成。");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}