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TablaMultiplicarServelet.java 4.24 KB
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agregando detalles aprendidos en la clase de hoy
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Matias Ferreira committed
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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("/tabla-multiplicar")
public class TablaMultiplicarServelet 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.length() <1)
				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) {
				invalid(pw, parametro);
			}
			else {
				Integer numero = Integer.parseInt(parametro);
				if(numero > 100) {
					greaterThan100(pw, numero);
					
				}
				else if(numero<0) {
					negative(pw);
					
				}
				else{
					theTable(pw, numero);			
				}
			}
		}
		pw.close();
	}
	
	void initForm(PrintWriter pw) {
		pw.write("<html>"
				+ "<head>"
				+ "<title>Hola, Aqui te enseño las tablas de la multiplicacion</title>"
				+ "</head>"
				+ "<body>"
				+ "<h1>Soy un generador de tablas de multiplicar</h1>"
				+ "<div>"
				+ "<form action=\"tabla-multiplicar\">"
				+ "Enter 1st number: <input type=\"text\"  name=number><br>"
				+ "<input type=\"submit\">"
				+ "</form>"
				+ "</div>"
				+ "</body>"
				+ "</html>");
	}
	
	void theTable(PrintWriter pw, Integer numero) {
		pw.write("<html>"
				+ "<head>"
				+ "<title>Hola, bienvenidos al multiplicador</title>"
				+ "</head>"
				+ "<body>"
				+ "<h1>Soy un generador de tablas de multiplicar</h1>"
				+ "<div>"
				+ "<form action=\"tabla-multiplicar\">"
				+ "Enter 1st number: <input type=\"text\"  name=number><br>"
				+ "<input type=\"submit\">"
				+ "</form>"
				+ "</div>"
				+ "<table style=\"width:5%\">"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>1 </th>" +"<th>=</th>" + "<th>"+(numero*1) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>2 </th>" +"<th>=</th>" + "<th>"+(numero*2) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>3 </th>" +"<th>=</th>" + "<th>"+(numero*3) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>4 </th>" +"<th>=</th>" + "<th>"+(numero*4) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>5 </th>" +"<th>=</th>" + "<th>"+(numero*5) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>6 </th>" +"<th>=</th>" + "<th>"+(numero*6) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>7 </th>" +"<th>=</th>" + "<th>"+(numero*7) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>8 </th>" +"<th>=</th>" + "<th>"+(numero*8) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>9 </th>" +"<th>=</th>" + "<th>"+(numero*9) + "</th>" + "</tr>"
				+ "<tr>"+ "<th>"+numero+"</th>" + "<th>*</th>"+ "<th>10</th>" +"<th>=</th>" + "<th>"+(numero*10)+ "</th>" + "</tr>"
				+ "</tdr>"
				+ "</body>"
				+ "</html>");	
	}
	
	void invalid(PrintWriter pw, String parametro) {
		pw.write("<html>"
				+ "<head>"
				+ "<title>Error de parametro</title>"
				+ "</head>"
				+ "<body>"
				+ "No se puede generarla tabla de multiplicar. Valor del parametro \"" + parametro + "\" invalido."
				+ "</body>"
				+ "</html>");
	}
	void greaterThan100(PrintWriter pw, Integer numero) {
		pw.write("<html>"
				+ "<head>"
				+ "<title>Error de parametro</title>"
				+ "</head>"
				+ "<body>"
				+ "Mi programa solo conoce la tabla de multiplicar hasta el numero 100. El numero pasado fue: "+numero
				+ "</body>"
				+ "</html>");
	}
	void negative(PrintWriter pw) {
		pw.write("<html>"
				+ "<head>"
				+ "<title>Error de parametro</title>"
				+ "</head>"
				+ "<body>"
				+ "Mi programa no sabe las tablas de multiplicar de numeros negativos"
				+ "</body>"
				+ "</html>");
	}
}