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java_dzienna_15_09
Commit 4506f643 by Patryk Czarnik
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Refaktoryzacja kalkulatora

parent 0e9e6483
Showing with 97 additions and 1 deletions
PC25-Serwlety/src/main/java/kalkulator/Kalkulator3.java
......@@ -31,8 +31,8 @@ public class Kalkulator3 extends HttpServlet {
out.println("</head>");
out.println("<body>");
out.println("<h1>Kalkulator 3</h1>");
out.println("<p>Wpisz liczby i wybierz działanie:</p>");
out.println("<form method='post'>");
out.println("<p>Wpisz liczby i wybierz działanie:</p>");
out.println("<input name='liczba1' type='number'>");
out.println("<select name='operacja'>");
out.println("<option value='+'>+</option>");
......
PC25-Serwlety/src/main/java/kalkulator/Kalkulator4.java 0 → 100644
package kalkulator;
import java.io.IOException;
import java.io.PrintWriter;
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("/Kalkulator4")
public class Kalkulator4 extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = naglowkiHTTP(response);
poczatekHTML(out);
wypiszFormularz(out);
koniecHTML(out);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = naglowkiHTTP(response);
poczatekHTML(out);
wypiszFormularz(out);
pobierzParametryIOblicz(request, out);
koniecHTML(out);
}
private PrintWriter naglowkiHTTP(HttpServletResponse response) throws IOException {
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
return out;
}
private void poczatekHTML(PrintWriter out) {
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Kalkulator serwletowy</title>");
out.println("<link rel='stylesheet' type='text/css' href='styl.css'>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Kalkulator 4</h1>");
}
private void koniecHTML(PrintWriter out) {
out.println("</body>");
out.println("</html>");
}
private void wypiszFormularz(PrintWriter out) {
out.println("<form method='post'>");
out.println("<p>Wpisz liczby i wybierz działanie:</p>");
out.println("<input name='liczba1' type='number'>");
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 name='liczba2' type='number'>");
out.println("<button>=</button>");
out.println("</form>");
}
private void pobierzParametryIOblicz(HttpServletRequest request, PrintWriter out) {
String param1 = request.getParameter("liczba1");
String param2 = request.getParameter("liczba2");
String operacja = request.getParameter("operacja");
try {
long liczba1 = Long.parseLong(param1);
long liczba2 = Long.parseLong(param2);
long wynik = oblicz(liczba1, liczba2, operacja);
out.printf("<div class='wynik'>%d %s %d = <strong>%d</strong></div>\n",
liczba1, operacja, liczba2, wynik);
} catch (NumberFormatException e) {
out.printf("<div class='error'>Niepoprawny format liczby</div>\n");
} catch(Exception e) {
out.printf("<div class='error'>Błąd: %s</div>\n", e.getMessage());
}
}
private long oblicz(long liczba1, long liczba2, String operacja) {
return switch(operacja) {
case "+" -> liczba1 + liczba2;
case "-" -> liczba1 - liczba2;
case "*" -> liczba1 * liczba2;
case "/" -> liczba1 / liczba2;
default -> throw new IllegalArgumentException("Nieznane działanie: " + operacja);
};
}
}
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