MakeQuizServlet.java - まるるん備忘録

※マーカーのようなものが引かれていますが、特に支障はないので気にしないで下さい。

MakeQuizServlet.java

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;
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(urlPatterns = {"/makequizservlet"})
public class MakeQuizServlet extends HttpServlet {

protected void processRequest(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");

try (PrintWriter out = response.getWriter()) {
request.setCharacterEncoding("UTF-8");

String name = request.getParameter("name");

Random r = new Random();
int[] formula = new int[2];
for(int i = 0; i < 2; i++) formula[i] = r.nextInt(99) + 1;

out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>問題</title>");
out.println("</head>");
out.println("<body>");
out.println("<h3>ようこそ" + name + "さん。この問題が解けるかな？</h3>");

// 数が１桁なら、空白を多めに詰める
switch(formula[0]){
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9: out.println("<h2 value=" + formula[0] + ">    " + formula[0] + "</h2>"); break;
default: out.println("<h2 value=" + formula[0] + ">  " + formula[0] + "</h2>"); break;
}

// 数が１桁なら、空白を多めに詰める
switch(formula[1]){
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9: out.println("<h2 value=" + formula[1] + ">+  " + formula[1] + "</h2>"); break;
default: out.println("<h2 value=" + formula[1] + ">+" + formula[1] + "</h2>"); break;
}

out.println("<hr>");
out.println("<form action=teachanswerservlet method=POST>");
out.println("<input type=text name=userAnswer value=0>");
out.println("<input type=hidden name=formula1 value=" + formula[0] + ">");
out.println("<input type=hidden name=formula2 value=" + formula[1] + ">");
out.println("<input type=submit>");
out.println("</form>");
out.println("</body>");
out.println("</html>");
}
}

@Override
protected void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {
processRequest(request, response);
}

@Override
protected void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {
processRequest(request, response);
}

@Override
public String getServletInfo() {
return "Short description";
}

}