Boa Tarde,
estou fazendo uma tela de login , porem toda vez que vou logar da erro e aparece a exepitoin, não consigo achar o erro de forma alguma estou a muito tempo procurando o erro no codigo , se alguem poder ajudar, a conexao com o banco de dados ta ok,
package br.com.infox.telas;
//importando os dados do sql
import java.sql.*;
import br.com.infox.dal.ModuloConexao;
import javax.swing.JOptionPane;
public class TelaLogin extends javax.swing.JFrame {
Connection conexao = null;
PreparedStatement pst = null;
ResultSet rs = null;
//metodo logar
public void logar(){
String sql = "select * from tbusuarios where login_user=? and senha_user=?";
try {
// as linhas abaixo preparam a consulta ao banco em funcao do
// que foi digitado nas caixas de texto . o "?" e substituto
//conteudo das variaveis
pst = conexao.prepareStatement(sql);
pst.setString(1, txtusuarios.getText());
pst.setString(2, txtsenha.getText());
// a linha abaixo execulta a consulta ao banco de dados
rs = pst.executeQuery();
//se existir usuario e senha corespondente entao abra a tela principal , senao exibe messagem de erro
if(rs.next()){
TelaPrincipal principal = new TelaPrincipal();
principal.setVisible(true);
}else{ JOptionPane.showMessageDialog(null,"Usuario ou Senha invalida!");
}
} catch (Exception e) { JOptionPane.showMessageDialog(null, e);
}
}
public TelaLogin() {
initComponents();
Connection conexao = ModuloConexao.conector();
//a linha abaixo serve de apoia ao status de conexao
//System.out.println(conexao);
//Caso conectado vai aparecer "conectado" senao "Desconectado"
// com texto
/* if (conexao != null) {
jLabel3.setText("conectado");
} else {
jLabel3.setText("Desconcectado");
}
*/
//para imagem
if (conexao != null) {
lblstatus.setIcon(new javax.swing.ImageIcon(getClass().getResource("/br/com/infox/icones/1.png")));
} else {
lblstatus.setIcon(new javax.swing.ImageIcon(getClass().getResource("/br/com/infox/icones/02.png")));
}
}
/**
* 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();
jLabel2 = new javax.swing.JLabel();
txtusuarios = new javax.swing.JTextField();
btnLogin = new javax.swing.JButton();
txtsenha = new javax.swing.JPasswordField();
lblstatus = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("System X - Login");
setResizable(false);
jLabel1.setText("Usuário");
jLabel2.setText("Senha");
txtusuarios.setText(" ");
btnLogin.setText("Login");
btnLogin.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnLoginActionPerformed(evt);
}
});
lblstatus.setIcon(new javax.swing.ImageIcon(getClass().getResource("/br/com/infox/icones/1.png"))); // NOI18N
lblstatus.setText(" ");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(71, 71, 71)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(txtusuarios, javax.swing.GroupLayout.PREFERRED_SIZE, 201, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(layout.createSequentialGroup()
.addComponent(lblstatus)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(btnLogin, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(txtsenha, javax.swing.GroupLayout.PREFERRED_SIZE, 201, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addContainerGap(78, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(30, 30, 30)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(txtusuarios, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(txtsenha, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 36, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lblstatus)
.addComponent(btnLogin, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(22, 22, 22))
);
setSize(new java.awt.Dimension(406, 227));
setLocationRelativeTo(null);
}// </editor-fold>
private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {
//chamando o metodo logar
logar();
}
/**
* @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(TelaLogin.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(TelaLogin.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(TelaLogin.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TelaLogin.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 TelaLogin().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton btnLogin;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel lblstatus;
private javax.swing.JPasswordField txtsenha;
private javax.swing.JTextField txtusuarios;
// End of variables declaration
}