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

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
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 Agenda
 */
@WebServlet("/agenda")
public class Agenda extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Agenda() {
        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 name = request.getParameter("nombre");
		String correo = request.getParameter("correo_electronico");
		String tel = request.getParameter("telefono");
		String dir = request.getParameter("direccion");
		
		int contador = 1;
		String ruta;
		File archivo;
		BufferedWriter bw;
		do {
			ruta = this.getServletContext().getRealPath("/Pagina/archivo"+contador+".txt");
			archivo = new File(ruta);
			contador++;
			
		} while (archivo.exists());
		System.out.println(archivo.getAbsolutePath());
		archivo.createNewFile();
		bw = new BufferedWriter(new FileWriter(archivo));
		
		bw.write(name);
		bw.write(correo);
		bw.write(tel);
		bw.write(dir);
		bw.close();
		
		response.getWriter().println("<html>\n" + 
				"<head>\n" + 
				"<meta charset=\"UTF-8\">"
				+ "<title>Agenda</title>\n" + 
				"</head>\n" + 
				"<body>"
					+ "Nombre: "+name+"<br>"
					+ "Correo: "+correo+"<br>"
					+ "Telefono: "+tel+"<br>"
					+ "Direccion: "+dir+"<br>"
					+ "Archivo Nro: "+contador+"."
				+ "</body>"
				+ "</html>"
				);
	}

}