Itext 7覆盖pdfHtml中的默认页边距

import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.property.UnitValue;
import com.itextpdf.styledxmlparser.css.page.PageMarginBoxContextNode;
import com.itextpdf.styledxmlparser.css.page.PageMarginBoxContextNodeConstants;
import com.itextpdf.styledxmlparser.css.page.PageMarginBoxContextNodeUtil;
import com.itextpdf.styledxmlparser.css.page.PageMarginBoxElementNode;
import com.itextpdf.styledxmlparser.node.IElementNode;
import com.itextpdf.styledxmlparser.node.impl.jsoup.JsoupHtmlParser;
import com.itextpdf.styledxmlparser.resolver.resource.ResourceResolver;
import com.itextpdf.styledxmlparser.resolver.resource.ResourceResolverFactory;
import com.itextpdf.styledxmlparser.resolver.resource.UriResolver;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class CustomPageMarginExample {

    public static void main(String[] args) throws IOException {
        // 输入HTML文件路径
        String htmlFilePath = "path/to/input.html";
        // 输出PDF文件路径
        String pdfFilePath = "path/to/output.pdf";

        // 创建PDF文档
        PdfDocument pdfDocument = new PdfDocument(new PdfWriter(pdfFilePath));
        Document document = new Document(pdfDocument, PageSize.A4);

        // 读取HTML文件内容
        InputStream inputStream = new FileInputStream(htmlFilePath);
        JsoupHtmlParser parser = new JsoupHtmlParser();
        IElementNode elementNode = parser.parse(inputStream, "UTF-8");

        // 设置自定义页边距
        PageMarginBoxContextNode pageMarginBoxContextNode = new PageMarginBoxContextNode();
        pageMarginBoxContextNode.setMarginTop(new UnitValue(UnitValue.PT, 50));
        pageMarginBoxContextNode.setMarginBottom(new UnitValue(UnitValue.PT, 50));
        pageMarginBoxContextNode.setMarginLeft(new UnitValue(UnitValue.PT, 50));
        pageMarginBoxContextNode.setMarginRight(new UnitValue(UnitValue.PT, 50));

        // 将自定义页边距应用到HTML内容中
        PageMarginBoxElementNode pageMarginBoxElementNode = new PageMarginBoxElementNode();
        pageMarginBoxElementNode.setContextNode(pageMarginBoxContextNode);
        pageMarginBoxElementNode.setTagName(PageMarginBoxContextNodeConstants.MARGIN_BOX_TAG);
        pageMarginBoxElementNode.setParent(elementNode);
        elementNode.addChild(pageMarginBoxElementNode);

        // 将HTML内容转换为PDF
        ConverterProperties converterProperties = new ConverterProperties();
        converterProperties.setBaseUri(htmlFilePath);
        ResourceResolver resourceResolver = ResourceResolverFactory.getInstance().createResourceResolver(htmlFilePath);
        converterProperties.setResourceResolver(new UriResolver(resourceResolver));
        HtmlConverter.convertToPdf(elementNode, document, converterProperties);

        // 关闭文档
        document.close();

        System.out.println("PDF生成成功！");
    }
}