package com.roshka.webprojecttest.servlets;
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("/factorial")
public class FactorialServlet extends HttpServlet {
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
PrintWriter pw = new PrintWriter(resp.getOutputStream());
Boolean valido=true;
String parametro = req.getParameter("number");
if(parametro == null ) {
initForm(pw);
}
else {
if(parametro.equals(""))
valido=false;
for(int i = 0 ; i < parametro.length(); i++) {
if( ( !Character.isDigit(parametro.charAt(i)) && i > 0) && !(Character.isDigit(parametro.charAt(i)) && i == 0 && parametro.charAt(i) != '-' ) ) {
valido=false;
break;
}
}
if (!valido) {
error(pw, parametro);
}
else {
Integer numero = Integer.parseInt(parametro);
if(numero > 100) {
greaterThan100(pw, numero);
}
else if(numero<0) {
negative(pw);
}
else{
long facto=1;
for (long i = 2; i <=numero;i++)
facto*=i;
factoDisplay(pw, numero, facto);
}
}
}
pw.close();
}
void factoDisplay(PrintWriter pw, Integer numero, Long facto) {
pw.write(""
+ ""
+ "Hola, bienvenidos al factorializador"
+ ""
+ ""
+ "Soy un generador de factorial de numeros
"
+ ""
+ ""
+ "
"
+ ""
+ "
El factorial de "+ numero+" es: " + facto +"
"
+ "
Soy un factorializador
"
+ ""
+ ""
+ "
"
+ ""
+ "");
}
}