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<html>
<head> <title>Ejemplo de servlet</title> </head>
<body>
<h1>Introduzca su nombre y pulse el boton de enviar</h1>
<form action="miaplicacion/HolaServlet" method="post">
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import java.io.*;
import javax.servlets.*;
import javax.servlets.http.*;
public class HolaServlet extends HttpServlet {
/** Redefinición del
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metodo
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public void init(ServletConfig config) throws ServletException {
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este caso*/
public void destroy() {
System.out.println("HolaServlet detenido a las " + new Date());
}
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doPost(),pudiéndose igualmente haberse optado por redefinir
service().Lo que sería incorrecto es redefinir doGet() ya que la
peticion se realizará por el método post*/
public void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException {
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String name = request.getParameter("nombre");
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response.setContentType("text/html");
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out.println("<title> Respuesta de HolaServlet </title>");
out.println("<head>");
out.println("<body>");
out.println("<h1>¡Funcionó!:El
pagina</h1>");
servlet
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generado
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out.println("<br>");
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out.println("<h2>Hola " + name + "</h2>");
out.println("</font>");
out.println("</body>");
out.println("</html>");
/** Se fuerza del volcado del buffer de la salida y se cierra
el canal*/
out.flush();
out.close();
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}//fin clase
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private static final long serialVersionUID = 1L;
public MiPrimerServletAsincrono() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request,
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ServletException, IOException {
// TODO Auto-generated method stub
procesandoElRequest(request, response);
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import javax.servlet.AsyncContext;
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@WebServlet(name="CabecerasServlet", urlPatterns={"/cabeceras"})
public class CabecerasServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request,
HttpServletResponse response) throws
ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try{
out.println("<html>");
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out.println("<head>");
out.println("<title>Cabeceras Servlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1> Cabeceras: </h1>");
out.println("<ul>");
Enumeration<String> nombresDeCabeceras =
request.getHeaderNames();
while (nombresDeCabeceras.hasMoreElements()) {
String cabecera = nombresDeCabeceras.nextElement();
out.println("<li><b>" + cabecera + ": </b>"
+ request.getHeader(cabecera) + "</li>");
}
out.println("</ul>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException,
IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException,
IOException {
processRequest(request, response);
}
}
Ejemplo 2
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<form method="get" action="/solicitud" name="datos">
Nombre: <input name="nombre"><br>
Apellidos: <input name="apellidos"><br>
Edad:
<select name="edad">
<option>Menor de 18</option>
<option>De 18 a 30</option>
<option>De 30 a 55</option>
<option>Mayor de 55</option>
</select>
<br>
Hobbies:<br>
<input name="hobbies" value="lectura"
type="checkbox">lectura<br>
<input name="hobbies" value="futbol"
type="checkbox">verfutbol<br>
<input name="hobbies" value="deporte" type="checkbox">jugar
tenis<br>
<br>
<button>Enviar</button></form>
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public class FormularioServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request,
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IOException {
String nombre = request.getParameter("nombre");
String apellidos = request.getParameter("apellidos");
String edad = request.getParameter("edad");
String[] hobbies = request.getParameterValues("hobbies");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet que procesa una
solicitud</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>" + "Hola " + nombre + " " + apellidos+
"</h1>");
out.println("Tu Franja de edad es " + edad + " y tus
hobbies son:");
}
out.println("<ul>");
for (String hobby : hobbies) {
out.println("<li>" + hobby + "</li>");
}
out.println("</ul>");
out.println("Esta solicitud ha sido invocado con Los
siguientes parametros:<br/>");
out.println(request.getQueryString());
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}