hola ...
quiero insertar datos que capto desde un formulario con un boton este es mi codigo, me devuelve este error:
java.lang.NullPointerException
// FormInsertarDatos.java
package inicio;
public class FormInsertar extends javax.swing.JFrame {
public FormInsertar() {
initComponents();
}
/**
* 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">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);
jLabel1.setText("jLabel1");
jButton1.setText("REGISTRAR");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
}
});
jLabel2.setText("NOMBRE");
jLabel3.setText("SUELDO");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILI NG, layout.createSequentialGroup()
.addGap(99, 99, 99)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jLabel3))
.addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED, 70, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILI NG, layout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 0, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(84, 84, 84))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILI NG, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.TRAILING, false)
.addComponent(jTextField2, javax.swing.GroupLayout.DEFAULT_SIZE, 166, Short.MAX_VALUE)
.addComponent(jTextField1))
.addGap(111, 111, 111))))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILI NG, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_S IZE, Short.MAX_VALUE)
.addComponent(jButton1)
.addGap(154, 154, 154))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(40, 40, 40)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addGap(18, 18, 18)
.addComponent(jLabel1)
.addGap(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3))
.addGap(28, 28, 28)
.addComponent(jButton1)
.addContainerGap(32, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
try{
RegistrarDatos mRegistrar=new RegistrarDatos();
mRegistrar.MetodoRegistrar(jTextField1.getText() ,jTextField2.getText());
}
catch(Exception e)
{
System.out.println(e);
}
// TODO add your handling code here:
}
/**
* @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.getClass Name());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(FormInsertar.cl ass.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(FormInsertar.cl ass.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(FormInsertar.cl ass.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(FormInsertar.cl ass.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 FormInsertar().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declaration
}
//RegistrarDatos.java
package inicio;
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;
public class RegistrarDatos {
String nombre, sueldo;
String user,pass,db,url,driver,sql;
Connection conn; Statement stmt;
public RegistrarDatos(){
this.user="root";this.pass="1234santiago";this.db= "inicioj";
this.url = "jdbc:mysql://localhost:3307/" ;
this.driver = "com.mysql.jdbc.Driver" ;
this.conn = null ;
}
public void MetodoRegistrar (String nombre , String sueldo) throws SQLException, InstantiationException, IllegalAccessException, ClassNotFoundException
{
this.nombre=nombre;
this.sueldo=sueldo;
System.out.println ( "MySQL Connect Example." ) ;
try {
Class.forName ( driver ) .newInstance () ;
conn = DriverManager.getConnection ( url+db,user,pass ) ;
sql = "INSERT INTO contactos (Nombre,Sueldo) VALUES ("+"'"+this.nombre+"','"+this.sueldo+"')";
JOptionPane.showMessageDialog(null,this.nombre+" "+this.sueldo);
stmt.execute(sql);
}
catch ( SQLException ex )
{
Logger.getLogger(FormInsertar.class.getName()).log (Level.SEVERE, null, ex);
System.out.println(ex);
}
}
}