package au.schnabbeldiwauw.webapp2; import jakarta.servlet.ServletException; import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; @WebServlet("/g") public class Gaestebuch extends HttpServlet { ArrayList buch = new ArrayList<>(); private String escapeHtml(String input) { if (input == null) return ""; return input.replace("&", "&") .replace("<", "<") .replace(">", ">") .replace("\"", """) .replace("'", "'"); } public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { PrintWriter w = res.getWriter(); res.setCharacterEncoding("UTF-8"); res.setContentType("text/html"); String content = ""; for (String s : buch) { content += "

" + escapeHtml(s) + "

"; } w.println(String.format(""" Gästebuch
%s """, content )); } public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { String text = req.getParameter("gaestepost"); buch.add(text); res.sendRedirect("./g"); } }