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Java Web desde cero en Netbeans ☁️[20.- JSP Centralizar codigo en servelets]

En este tutorial vamos a centralizar nuestro codigo de empleados en un servelet para mandarlo a llamar desde donde lo necesitemos.

Codigo: https://github.com/programadornovato/javaWeb/commit/6e2de4ee31128a846f9828ce724f9f638c3d87fb

package Servelets;

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;

import java.sql.*;

import com.mysql.jdbc.Driver;

/**

* @author eugenio

@WebServlet(name = "Empleados", urlPatterns = {"/Empleados"})

public class Empleados extends HttpServlet {

Connection con = null;

Statement st = null;

ResultSet rs = null;

/**

* Processes requests for both HTTP <code>GET</code> and <code>POST</code>

* methods.

* @param request servlet request

* @param response servlet response

* @throws ServletException if a servlet-specific error occurs

* @throws IOException if an I/O error occurs

protected void processRequest(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

try (PrintWriter out = response.getWriter()) {

/* TODO output your page here. You may use following sample code. */

try {

Class.forName("com.mysql.jdbc.Driver");

con = DriverManager.getConnection("jdbc:mysql://localhost/jsp?user=eugenio&password=123456");

st = con.createStatement();

rs = st.executeQuery("SELECT * FROM `empledos`;");

while (rs.next()) {

out.print("<tr>"

+ "<th scope=\"row\">" + rs.getString(1) + "</th>"

+ "<td>" + rs.getString(2) + "</td>"

+ "<td>" + rs.getString(3) + "</td>"

+ "<td>" + rs.getString(4) + "</td>"

+ "<td>"

+ " <a href=\"editar.jsp?id=" + rs.getString(1) + "&nombre=" + rs.getString(2) + "&direccion=" + rs.getString(3) + "&telefono=" + rs.getString(4) + "\"><i class=\"fa fa-pencil\" aria-hidden=\"true\"></i></a>"

+ " <a href=\"borrar.jsp?id=" + rs.getString(1) + "\" class=\"ml-1\"><i class=\"fa fa-trash\" aria-hidden=\"true\"></i></a>"

+ "</td>"

+ "</tr>"

);

}

} catch (Exception e) {

out.print("error mysql " + e);

}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

/**

* Handles the HTTP <code>GET</code> method.

* @param request servlet request

* @param response servlet response

* @throws ServletException if a servlet-specific error occurs

* @throws IOException if an I/O error occurs

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request, response);

}

/**

* Handles the HTTP <code>POST</code> method.

* @param request servlet request

* @param response servlet response

* @throws ServletException if a servlet-specific error occurs

* @throws IOException if an I/O error occurs

@Override

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request, response);

}

/**

* Returns a short description of the servlet.

* @return a String containing servlet description

@Override

public String getServletInfo() {

return "Short description";

}// </editor-fold>

}

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<title>Lista de empleados</title>

</head>

<body>

HttpSession sesion = request.getSession();

if (sesion.getAttribute("logueado") == null || sesion.getAttribute("logueado").equals("0")) {

response.sendRedirect("login.jsp");

}

<a class="navbar-brand">Programador novato</a>

</form>

</nav>

<thead>

<tr>

<th scope="col" colspan="4" class="text-center"><h3>Empleados</h3></th>

</th>

</tr>

<tr>

<th scope="col">Nombre</th>

<th scope="col">Direccion</th>

<th scope="col">Telefono</th>

<th scope="col">Acciones</th>

</tr>

</thead>

<tbody>

<jsp:include page="Empleados"/>

</tbody>

</table>

</div>

</body>

</html>

package Servelets; 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; import java.sql.*; import com.mysql.jdbc.Driver; /** * * @author eugenio */ @WebServlet(name = "Empleados", urlPatterns = {"/Empleados"}) public class Empleados extends HttpServlet { Connection con = null; Statement st = null; ResultSet rs = null; /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> * methods. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try (PrintWriter out = response.getWriter()) { /* TODO output your page here. You may use following sample code. */ try { Class.forName("com.mysql.jdbc.Driver"); con = DriverManager.getConnection("jdbc:mysql://localhost/jsp?user=eugenio&password=123456"); st = con.createStatement(); rs = st.executeQuery("SELECT * FROM `empledos`;"); while (rs.next()) { out.print("<tr>" + "<th scope=\"row\">" + rs.getString(1) + "</th>" + "<td>" + rs.getString(2) + "</td>" + "<td>" + rs.getString(3) + "</td>" + "<td>" + rs.getString(4) + "</td>" + "<td>" + " <a href=\"editar.jsp?id=" + rs.getString(1) + "&nombre=" + rs.getString(2) + "&direccion=" + rs.getString(3) + "&telefono=" + rs.getString(4) + "\"><i class=\"fa fa-pencil\" aria-hidden=\"true\"></i></a>" + " <a href=\"borrar.jsp?id=" + rs.getString(1) + "\" class=\"ml-1\"><i class=\"fa fa-trash\" aria-hidden=\"true\"></i></a>" + "</td>" + "</tr>" ); } } catch (Exception e) { out.print("error mysql " + e); } } } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP <code>GET</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP <code>POST</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> } <%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous"> <link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous"> <title>Lista de empleados</title> </head> <body> <% HttpSession sesion = request.getSession(); if (sesion.getAttribute("logueado") == null || sesion.getAttribute("logueado").equals("0")) { response.sendRedirect("login.jsp"); } %> <div class="container"> <nav class="navbar navbar-light bg-light"> <a class="navbar-brand">Programador novato</a> <form class="form-inline" action="logout.jsp"> <a href="datosUsuario.jsp"><i class="fa fa-user-circle" aria-hidden="true"></i> <%= sesion.getAttribute("user")%></a> <button class="btn btn-outline-danger my-2 my-sm-0 ml-2" type="submit">Log out</button> </form> </nav> <div class="row mt-2"> <div class="col-sm"> <table class="table table-striped"> <thead> <tr> <th scope="col" colspan="4" class="text-center"><h3>Empleados</h3></th> <th scope="col" > <a href="crear.jsp"><i class="fa fa-user-plus" aria-hidden="true"></i></a> </th> </tr> <tr> <th scope="col">ID</th> <th scope="col">Nombre</th> <th scope="col">Direccion</th> <th scope="col">Telefono</th> <th scope="col">Acciones</th> </tr> </thead> <tbody> <jsp:include page="Empleados"/> </tbody> </table> </div> </div> </div> </body> </html>

package Servelets;

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;
import java.sql.*;
import com.mysql.jdbc.Driver;

/**
 *
 * @author eugenio
 */
@WebServlet(name = "Empleados", urlPatterns = {"/Empleados"})
public class Empleados extends HttpServlet {

    Connection con = null;
    Statement st = null;
    ResultSet rs = null;

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */

            try {

                Class.forName("com.mysql.jdbc.Driver");
                con = DriverManager.getConnection("jdbc:mysql://localhost/jsp?user=eugenio&password=123456");
                st = con.createStatement();
                rs = st.executeQuery("SELECT * FROM `empledos`;");
                while (rs.next()) {

                    out.print("<tr>"
                            + "<th scope=\"row\">" + rs.getString(1) + "</th>"
                            + "<td>" + rs.getString(2) + "</td>"
                            + "<td>" + rs.getString(3) + "</td>"
                            + "<td>" + rs.getString(4) + "</td>"
                            + "<td>"
                            + "  <a href=\"editar.jsp?id=" + rs.getString(1) + "&nombre=" + rs.getString(2) + "&direccion=" + rs.getString(3) + "&telefono=" + rs.getString(4) + "\"><i class=\"fa fa-pencil\" aria-hidden=\"true\"></i></a>"
                            + "  <a href=\"borrar.jsp?id=" + rs.getString(1) + "\" class=\"ml-1\"><i class=\"fa fa-trash\" aria-hidden=\"true\"></i></a>"
                            + "</td>"
                            + "</tr>"
                    );

                }
            } catch (Exception e) {
                out.print("error mysql " + e);
            }

        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
        <link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
        <title>Lista de empleados</title>
    </head>
    <body>
        <%
            HttpSession sesion = request.getSession();
            if (sesion.getAttribute("logueado") == null || sesion.getAttribute("logueado").equals("0")) {
                response.sendRedirect("login.jsp");
            }
        %>
        <div class="container">
            <nav class="navbar navbar-light bg-light">
                <a class="navbar-brand">Programador novato</a>
                <form class="form-inline" action="logout.jsp">
                    <a href="datosUsuario.jsp"><i class="fa fa-user-circle" aria-hidden="true"></i> <%= sesion.getAttribute("user")%></a>
                    <button class="btn btn-outline-danger my-2 my-sm-0 ml-2" type="submit">Log out</button>
                </form>
            </nav>
            <div class="row mt-2">
                <div class="col-sm">
                    <table class="table table-striped">
                        <thead>
                            <tr>
                                <th scope="col" colspan="4" class="text-center"><h3>Empleados</h3></th>
                                <th scope="col" >
                                    <a href="crear.jsp"><i class="fa fa-user-plus" aria-hidden="true"></i></a>
                                </th>

                            </tr>
                            <tr>
                                <th scope="col">ID</th>
                                <th scope="col">Nombre</th>
                                <th scope="col">Direccion</th>
                                <th scope="col">Telefono</th>
                                <th scope="col">Acciones</th>
                            </tr>
                        </thead>
                        <tbody>
                            <jsp:include page="Empleados"/>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </body>
</html>

Curso de Java de 0 a 100: https://www.youtube.com/playlist?list=PLCTD_CpMeEKTT-qEHGqZH3fkBgXH4GOTF

? Esta lista de reproducción: https://www.youtube.com/playlist?list=PLCTD_CpMeEKRAgcBmPee0Wjx5HsJ0nb0L
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