Problème avec actionPerformed() unknown source
Bonjour,
J'ai une interface d'authentification, et je dois effectuer la vérification du login et mot de passe tapé en passant par la base de données, j'ai donc fais ce code mais lorsque j'exécute la classe, j'obtient une erreur lorsque je clique sur le bouton "login", de meme en cliquant sur "cancel".
Code:
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| package workflow.interfaces;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class UserLogin extends JFrame {
private Statement statement;
private ResultSet rs;
private JTextArea errorText;
private String passVerif;
private int id_entreprise;
JButton login, cancel;
JTextField uname;
JPasswordField pass;
JLabel u,p;
public UserLogin(){
setTitle("Login");
setLayout(new GridLayout(3,2));
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
u = new JLabel("Username");
p = new JLabel("Password");
uname = new JTextField(20);
pass = new JPasswordField(20);
login = new JButton("Login");
cancel = new JButton("Cancel");
add(u);
add(uname);
add(p);
add(pass);
add(login);
add(cancel);
uname.requestFocus();
login.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
String un=uname.getText();
String pa= new String(pass.getPassword());
connectToDB();
try {
rs = statement.executeQuery("SELECT * FROM entreprise WHERE login = " + un);
/* si le login existe dans la base de données
alors récuperer le password et vérifier sa correspondance */
while (rs.next()){
id_entreprise = rs.getInt("id_entreprise");
// String nom_entreprise = rs.getString("nom_entr");
// String login = rs.getString("login");
passVerif = rs.getString("passe");
int row = rs.getRow();
System.out.println("Données contenues dans la ligne "+row);
System.out.println("id entreprise : "+id_entreprise);
if ((pa.equals(passVerif))){
dispose();
new WelcomeFrame();
}
else errorText.append("Veuillez resaisir votre mot de passe");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
KeyAdapter k = new KeyAdapter(){
public void KeyPressed(KeyEvent ke){
if (ke.getKeyCode() == KeyEvent.VK_ENTER)
login.doClick();
}
};
pass.addKeyListener(k);
uname.addKeyListener(k);
pack();
setLocationRelativeTo(null);
}
public void connectToDB() {
try {
Connection connection = DriverManager
.getConnection("jdbc:mysql://localhost:3306/destockage", "xxx", "xxxx");
Statement statement = connection.createStatement();
} catch (SQLException connectException) {
System.out.println(connectException.getMessage());
System.out.println(connectException.getSQLState());
System.out.println(connectException.getErrorCode());
System.exit(1);
}
}
public static void main(String[] args) {
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch (Exception e) {
System.err.println("Unable to find and load driver");
System.exit(1);
}
new UserLogin();
}
} |
Erreur:
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| connexion bd établie
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at workflow.interfaces.UserLogin$1.actionPerformed(UserLogin.java:71)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source) |
Que pourra être le problème?
Merci pour votre aide
