How to save an html page in java

Question

I have a project that I need to make a report for each code. And save it on disk in PDF format. After generating the report, I don’t know how to pass the page (generated) to Servlet and save it in PDF.

I was able to upload the html to Servlet, now I need to know how to convert the tags (html) so that java can interpret them and transform them into PDF.

Servlet

    /*
     * To change this license header, choose License Headers in Project Properties.
     * To change this template file, choose Tools | Templates
     * and open the template in the editor.
     */
    package br.com.drz.paraopeba.servlets;

    import com.itextpdf.text.Document;
    import com.itextpdf.text.html.simpleparser.HTMLWorker;
    import com.itextpdf.text.pdf.PdfWriter;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.io.PrintWriter;
    import java.io.StringReader;
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;

    /**
     *
     * @author douglas
     */
    @WebServlet(name = "salvarPDF", urlPatterns = {"/salvarPDF"})
    public class salvarPDF extends HttpServlet {

        private static final String SAVE_DIR = "relatorios";

        /**
         * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
         * methods.
         *
         * @param request servlet request
         * @param response servlet response
         * @throws ServletException if a servlet-specific error occurs
         * @throws IOException if an I/O error occurs
         */
        protected void processRequest(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            response.setContentType("text/html;charset=UTF-8");
            try (PrintWriter out = response.getWriter()) {

            }
        }

        // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
        /**
         * Handles the HTTP <code>GET</code> method.
         *
         * @param request servlet request
         * @param response servlet response
         * @throws ServletException if a servlet-specific error occurs
         * @throws IOException if an I/O error occurs
         */
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {



            processRequest(request, response);
        }

        /**
         * Handles the HTTP <code>POST</code> method.
         *
         * @param request servlet request
         * @param response servlet response
         * @throws ServletException if a servlet-specific error occurs
         * @throws IOException if an I/O error occurs
         */
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

            String  html = request.getParameter("conteudo");


            try {

                String appPath = request.getServletContext().getRealPath("");
                String savePath = appPath  + SAVE_DIR + File.separator;

                OutputStream file = new FileOutputStream(new File(savePath + "teste.pdf"));
                Document document = new Document();
                PdfWriter.getInstance(document, file);
                document.open();
                HTMLWorker htmlWorker = new HTMLWorker(document);
                htmlWorker.parse(new StringReader(html));
                document.close();
                file.close();
            } catch (Exception e) {
                e.printStackTrace();
            }

            processRequest(request, response);
        }


        /**
         * Returns a short description of the servlet.
         *
         * @return a String containing servlet description
         */
        @Override
        public String getServletInfo() {
            return "Short description";
        }// </editor-fold>

    }

Answer 1

An option for PDF generation would be to generate a report even using iReports or Jasper.

If this is not an option, Voce can venture into libraries that convert HTML to PDF, some cases here

I don’t really recommend using this type of library, as PDF generation is usually not very consistent. Each of these libraries interprets the CSS in a different way, and some cases, it doesn’t even interpret. The end result usually gets coarse and ugly.

If your HTML is simple enough, maybe Voce can minimize these problems.