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20230403
Commit 3031b2d1 by Patryk Czarnik
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kalkulator POST - refaktoryzacja

parent 6c552be9
Showing with 47 additions and 22 deletions
PC24-Serwlety/src/main/java/formularze/KalkulatorPost.java
......@@ -14,10 +14,7 @@ public class KalkulatorPost extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String parametr1 = request.getParameter("liczba1");
String parametr2 = request.getParameter("liczba2");
String operacja = request.getParameter("operacja");
// w tej wersji GET służy tylko do wyświetlenia pustego formularza
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
......@@ -27,37 +24,65 @@ public class KalkulatorPost extends HttpServlet {
out.println("<title>Kalkulator</title>");
out.println("</head>");
out.println("<body>");
out.println("<form method='post'>");
out.println("<input type='number' name='liczba1'>");
out.println("<select name='operacja'>");
out.println("<option value='+'>+</option>");
out.println("<option value='-'>-</option>");
out.println("<option value='*'>*</option>");
out.println("<option value='/'>/</option>");
out.println("</select>");
out.println("<input type='number' name='liczba2'>");
out.println("<button>Oblicz</button>");
out.println("</form>");
wydrukujFormularz(out);
if(parametr1 != null && !parametr1.isBlank()
&& parametr2 != null && !parametr2.isBlank()
&& operacja != null && !operacja.isBlank()) {
koniecStrony(out);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// doPost obsługuje przysłane dane z formularza
PrintWriter out = poczatekStrony(response);
wydrukujFormularz(out);
try {
String parametr1 = request.getParameter("liczba1");
String parametr2 = request.getParameter("liczba2");
String operacja = request.getParameter("operacja");
int liczba1 = Integer.parseInt(parametr1);
int liczba2 = Integer.parseInt(parametr2);
int wynik = oblicz(liczba1, liczba2, operacja);
out.println("<div>Działanie: " + liczba1 + " " + operacja + " " + liczba2 + "</div>");
out.println("<div>Wynik: " + wynik + "</div>");
} catch (Exception e) {
out.println("<div>Błąd: " + e + "</div>");
}
koniecStrony(out);
}
private void koniecStrony(PrintWriter out) {
out.println("</body>");
out.println("</html>");
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
private PrintWriter poczatekStrony(HttpServletResponse response) throws IOException {
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html><head>");
out.println("<title>Kalkulator</title>");
out.println("</head>");
out.println("<body>");
return out;
}
private void wydrukujFormularz(PrintWriter out) {
out.println("<form method='post'>");
out.println("<input type='number' name='liczba1'>");
out.println("<select name='operacja'>");
out.println("<option value='+'>+</option>");
out.println("<option value='-'>-</option>");
out.println("<option value='*'>*</option>");
out.println("<option value='/'>/</option>");
out.println("</select>");
out.println("<input type='number' name='liczba2'>");
out.println("<button>Oblicz</button>");
out.println("</form>");
}
private int oblicz(int liczba1, int liczba2, String operacja) {
return switch (operacja) {
......
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