各位朋友，现在用itext将html转为pdf时，用到HtmlParser.parse报错，是缺jar包吗

package topdf;

import java.io.FileOutputStream;

import com.itextpdf.text.Document;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;

public class HtmlToPdf {
public static void main(String[] args){
Document pdf = new Document(PageSize.A4, 50, 50, 50, 50);
try {
PdfWriter.getInstance(pdf, new FileOutputStream("d:/t.pdf"));
pdf.open();
HtmlParser.parse(pdf, "D:/t.html");//报错？？
} finally {
pdf.close();
}

}

}