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>
<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
Codigos en gdrive: https://drive.google.com/file/d/10uLG9o2oDV-qB32G4kMIpzXgLCiUYaYz/view?usp=sharing
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