我正在使用Java和Sping Boot 创建一个应用程序，我正在使用itext库生成一个pdf。这个pdf有泰卢固语和英语语言。但是，问题是英语正确地出现在PDF中，但来到泰卢固语语言，我得到空白，而不是泰卢固语文本。
我已经包含了字符. Unicode脚本.TELUGU和基本字体.IDENTITY_H
但是什么都不起作用。所以，任何人请指导我解决这个问题。谢谢。
下面我附上代码请，检查.
1.代码
公共类PdfTelugu {

public void export(HttpServletRequest request, HttpServletResponse response, School school)    
                throws DocumentException, ParseException, java.io.IOException
{
    

    //Create Document
    Document doc  = new Document();
    
    //Pass 2 things ---> What to render & where to render
    PdfWriter instance2 = PdfWriter.getInstance(doc, response.getOutputStream());

    //Open the document to start the work
    doc.open();

    PdfPTable table = new PdfPTable(3);
    table.setWidthPercentage(100.0f);

    table.setWidths(new float[] {1.5f, 11.6f, 10.0f });
    Paragraph heading = new Paragraph();

    //Testing for Telugu Text

    Font font = FontFactory.getFont(FontFactory.defaultEncoding, 11, Font.NORMAL);

                PdfPCell c1 = new PdfPCell(new Phrase("1", font));
                c1.setVerticalAlignment(Element.ALIGN_CENTER);
                c1.setPaddingBottom(12f);
                //c1.setBorder(Rectangle.NO_BORDER);
                table.addCell(c1);

                c1 = new PdfPCell(new Phrase("పాఠశాల పేరు", font));
                c1.setVerticalAlignment(Element.ALIGN_CENTER);
                c1.setPaddingBottom(12f);
                //c1.setBorder(Rectangle.NO_BORDER);            
                table.addCell(c1);

                c1 = new PdfPCell(new Phrase("School Name",  font));
                c1.setVerticalAlignment(Element.ALIGN_CENTER);
                c1.setPaddingBottom(12f);
                //c1.setBorder(Rectangle.NO_BORDER);        
                table.addCell(c1);  

            //Here, Closing the document.
            doc.close();
            try {
                ServletOutputStream os = response.getOutputStream();
                os.flush();
                os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
}

}