Programador Novato

En este tutorial vamos llenar nuestra tabla (JTable) con los datos de nuestra base de datos en mysql. Para esto vamos a inicializar la conexión cuando se cargue el constructor de nuestro formulario para después llenar la tabla desde el botón llenarTabla

Java swing: https://es.wikipedia.org/wiki/Swing_(biblioteca_gr%C3%A1fica)
Documentación de java: https://docs.oracle.com/javase/8/docs/api/

Codigo: https://github.com/programadornovato/JavaGUI/commit/24b1ccbea738a671d6560b100dd45461ee9043a1

package com.programadornovato.javagui;

import javax.swing.JOptionPane;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.table.DefaultTableModel;

/**
 *
 * @author eugenio
 */
public class Formulario extends javax.swing.JFrame {
    DefaultTableModel modelo=new DefaultTableModel();
    Statement ejecutor=null;
    Connection con;
    String driver="com.mysql.cj.jdbc.Driver";
    String user="eugenio";
    String pass="123456";
    String url="jdbc:mysql://localhost:3306/empleados?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC";
    protected void cargaTabla(){
        modelo.addColumn("id");
        modelo.addColumn("nombre");
        modelo.addColumn("puesto");
        modelo.addColumn("edad");
        modelo.setRowCount(0);
        String datos[]=new String[4];
        String query="select * from empleados;";
        ResultSet rs;
        try {
            ejecutor=con.createStatement();
            ejecutor.setQueryTimeout(20);
            rs=ejecutor.executeQuery(query);
            while(rs.next()==true){
                datos[0]=rs.getString("id");
                datos[1]=rs.getString("nombre");
                datos[2]=rs.getString("puesto");
                datos[3]=rs.getString("edad");
                modelo.addRow(datos);
            }
            tablaEmpleados.setModel(modelo);
            
        } catch (Exception e) {
        }
        
        
        
    }
    public void conectar(){
        con=null;
        try {
            Class.forName(driver);
            con=(Connection) DriverManager.getConnection(url,user,pass);
            if(con!=null){
                estadoCon.setText("Conexion exitosa");
            }
        } catch (Exception e) {
            estadoCon.setText("Conexion no exitosa "+e);
        }
    }
    /**
     * Creates new form Formulario
     */
    public Formulario() {
        initComponents();
        conectar();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        estadoCon = new javax.swing.JLabel();
        llenarTabla = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        tablaEmpleados = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        llenarTabla.setText("Llenar tabla");
        llenarTabla.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                llenarTablaActionPerformed(evt);
            }
        });

        tablaEmpleados.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null}
            },
            new String [] {
                "id", "nombre", "puesto", "edad"
            }
        ));
        jScrollPane1.setViewportView(tablaEmpleados);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(llenarTabla)
                        .addGap(18, 18, 18)
                        .addComponent(estadoCon, javax.swing.GroupLayout.PREFERRED_SIZE, 345, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(130, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(estadoCon, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(llenarTabla))
                .addGap(28, 28, 28)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(77, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void llenarTablaActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_llenarTablaActionPerformed
        //conectar();
        cargaTabla();
    }//GEN-LAST:event_llenarTablaActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Formulario.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Formulario.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Formulario.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Formulario.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Formulario().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel estadoCon;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JButton llenarTabla;
    private javax.swing.JTable tablaEmpleados;
    // End of variables declaration//GEN-END:variables
}

[Curso] Java Netbeans GUI Completo☕: https://www.youtube.com/watch?v=S0XKc_MJCS0&list=PLCTD_CpMeEKThfXo8D-RXOGu5FarO7_qv

? Instalar Netbeans 11 en Windows 10: https://www.youtube.com/watch?v=EouitrKS6Cw
? Instalar Netbeans 11 en Ubuntu con Snap [Más fácil que en windows?]: https://www.youtube.com/watch?v=LllPPV9SMzQ
? Descargar e Instalar Netbeans 11 en ubuntu 18 04: https://www.youtube.com/watch?v=tWiX3Z5t5kQ
? Netbeans Sublime Theme ?: https://www.youtube.com/watch?v=oAF2Q7mTZZM
? Editar CSS directamenete en Chrome con Netbeans: https://www.youtube.com/watch?v=HlQs0a7R2cY
Pagina de netbeans: https://netbeans.org/

Instalar MySQL? en Ubuntu 18.04: https://www.youtube.com/watch?v=hx-nGKFVixA
Instalar PhpMyAdmin en Windows 10 ⛵: https://youtu.be/36ritPuyd00
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