无法正确切换字体的Itext7 Html到PDF的转换

import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
import com.itextpdf.layout.font.FontProvider;
import com.itextpdf.layout.font.FontSet;
import com.itextpdf.layout.font.IFontProvider;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class HtmlToPdfConverter {
    public static void main(String[] args) throws IOException {
        ConverterProperties converterProperties = new ConverterProperties();

        // 设置自定义字体映射
        FontProvider fontProvider = new FontProvider();
        fontProvider.addFont("path/to/font.ttf"); // 替换为实际字体文件的路径
        converterProperties.setFontProvider(fontProvider);

        FileInputStream htmlFile = new FileInputStream("path/to/input.html"); // 替换为实际HTML文件的路径
        FileOutputStream pdfFile = new FileOutputStream("path/to/output.pdf"); // 替换为生成的PDF文件的路径

        // 执行HTML到PDF转换
        HtmlConverter.convertToPdf(htmlFile, pdfFile, converterProperties);

        htmlFile.close();
        pdfFile.close();
    }
}