import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name="PdfServlet", urlPatterns={"/PdfServlet"})
public class PdfServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        doPost(request, response);
    } 

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException{
        response.setContentType("application/pdf");
        Document document = new Document();
        try{           
            PdfWriter.getInstance(document, response.getOutputStream());
            document.open();
            document.add(new Paragraph("Hello Table"));
            PdfPTable table = new PdfPTable(2);
            table.addCell("One");
            table.addCell("Two");
            table.addCell("Three");
            table.addCell("Four");
            table.addCell("Five");
            table.addCell("Six");
            
            document.add(table);
            document.close();
        }
        catch(DocumentException e){
            e.printStackTrace();
        }
    }
}