import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.util.ArrayList; 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 jakarta.servlet.http.HttpSession; @WebServlet("/Quiz") public class Quiz extends HttpServlet { private static final String ANSWER = "answer"; private static final String SCORE = "score"; private static final String NUMBER = "number"; private static final String QUESTIONS = "questions"; @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 最初の問は GET doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType( "text/html; charset=UTF-8"); PrintWriter out = response.getWriter(); out.println(""); int i, number = 0, score = 0; ArrayList questions; HttpSession session = request.getSession(true); if (session.isNew() || session.getAttribute(QUESTIONS) == null) { // 最初の問 questions = new ArrayList(); File f = new File(getServletContext() .getRealPath("/WEB-INF/quiz.txt")); BufferedReader in = new BufferedReader(new InputStreamReader( new FileInputStream(f), "UTF-8")); String line=""; while ((line = in.readLine()) != null) { line = line.trim(); if (line.trim().equals("")) continue; // 空白の１つ以上の繰返し questions.add(line.split("\\s+")); } in.close(); session.setAttribute(QUESTIONS, questions); out.println("

ようこそ QUIZへ!
"); out.println(" では最初の問題です。

"); } else { // 最初の問ではない try { number = (int)session.getAttribute(NUMBER); score = (int)session.getAttribute(SCORE); questions = (ArrayList) session.getAttribute(QUESTIONS); String[] tokens = questions.get(number - 1); int a = Integer.parseInt( tokens[tokens.length - 1]); int answer = Integer.parseInt( request.getParameter(ANSWER)); if (a == answer) { // a は最後の文字 out.println("正解です。
"); score++; } else { out.println("残念でした。
"); } } catch (Exception e) { session.removeAttribute(QUESTIONS); out.println( "想定外のアクセスでエラーが起こりました。" + "タブを閉じるかリロードしてください。"); e.printStackTrace(out); out.println(""); out.close(); return; } } if (number >= questions.size()) { // 終 out.println("
"); out.println("これで QUIZは終わりです。
"); out.printf("正解数は、%d問でした。%n", score); session.removeAttribute(QUESTIONS); } else { // 次の問を表示 String[] tokens = questions.get(number); out.println("次の問: " + tokens[0] + "
"); out.println(""); number++; session.setAttribute(NUMBER, number); session.setAttribute(SCORE, score); } out.println(""); out.close(); } }