如何使用iText get pdf渲染多种字体

import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.font.PdfFontProvider;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;

public class FontRenderingExample {
    public static void main(String[] args) {
        String dest = "output.pdf";
        
        try {
            // 创建PDF文档
            PdfWriter writer = new PdfWriter(dest);
            PdfDocument pdf = new PdfDocument(writer);
            Document document = new Document(pdf);
            
            // 设置字体
            PdfFontProvider fontProvider = new PdfFontProvider();
            fontProvider.addFont("fonts/Arial.ttf");
            fontProvider.addFont("fonts/TimesNewRoman.ttf");
            
            // 渲染字体
            PdfFont fontArial = fontProvider.getFont("Arial");
            PdfFont fontTimes = fontProvider.getFont("Times New Roman");
            
            PdfCanvas canvas = new PdfCanvas(pdf.addNewPage());
            canvas.setFontAndSize(fontArial, 12);
            canvas.beginText();
            canvas.moveText(50, 700);
            canvas.showText("This is Arial font.");
            canvas.endText();
            
            canvas.setFontAndSize(fontTimes, 12);
            canvas.beginText();
            canvas.moveText(50, 650);
            canvas.showText("This is Times New Roman font.");
            canvas.endText();
            
            // 添加内容
            document.add(new Paragraph("Hello, World!"));
            
            // 关闭文档
            document.close();
            
            System.out.println("PDF created successfully!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}