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Primer ejercicio de Java Web
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package com.roshka.bootcamp004;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Conversor
 */
@WebServlet("/conversor")
public class Conversor extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Conversor() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
		response.getWriter().println("hola");
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String tipo = request.getParameter("tipo_temperatura");
		String valor = request.getParameter("valor_temperatura");
		
		double valor_temperaturaD = Double.parseDouble(valor);
		
		double kel = 0;
		double fah = 0;
		double cel = 0;
		
		if (tipo.equals ("kelvin")) {
			kel = valor_temperaturaD;
			fah = fah + (valor_temperaturaD - 273.15) * 9/5 + 32;
			cel = cel + (valor_temperaturaD - 273.15);
		}
		if (tipo.equals("fahrenheit")) {
			fah = valor_temperaturaD;
			kel = kel + ((valor_temperaturaD - 32) * 5/9 + 273.15);
			cel = cel + ((valor_temperaturaD - 32) * 5/9);
		}
		if (tipo.equals("celcius")) {
			cel = valor_temperaturaD;
			kel = kel + (valor_temperaturaD + 273.15);
			fah = fah + ((valor_temperaturaD * 9/5) + 32 );
		}
		
		response.getWriter().println("<html>\n" + 
				"<head>\n" + 
				"<meta charset=\"UTF-8\">"
				+ "<title>Convertidor</title>\n" + 
				"</head>\n" + 
				"<body>"
				+ "La temperatura es en: <br>"
				+ "Kelvin: "+kel+ " grados <br>"
				+ "Fahrenheit "+fah+ " grados <br>"
				+ "Celcius "+cel+ " grados <br>"
						+ "</body>"
						+ "</html>"
				);
	}

}