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harmohit
jdbc problem
1 Answer(s)      2 years and 8 months ago
Posted in : JDBC


hi my name is mohit...i am making a project in java swings....pls help me how to check that the username and password are correct...the user inputs the username and password and then i want to match the username and password with the already entered username and password in the database...if the entered values match then the user goes to another page and if the entered values are not correct then the program ends...it just like yahoo mail , gmail....i have made this code in netbeans...i have already entered the values in the database....pls help me guys...i am new to java...pls help me learn...

thanks a lot...

1)login page(this is made in swings)

public class loginpage extends javax.swing.JFrame {

String Username= " " , Password =" ";

public loginpage() {
    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();
    jLabel2 = new javax.swing.JLabel();
    jPasswordField1 = new javax.swing.JPasswordField();
    jButton1 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jLabel1.setText("Username");

    jLabel2.setText("Password");

    jButton1.setText("login");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    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(108, 108, 108)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel2))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 134, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                .addComponent(jPasswordField1)
                .addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 181, Short.MAX_VALUE))
            .addGap(121, 121, 121))
        .addGroup(layout.createSequentialGroup()
            .addGap(217, 217, 217)
            .addComponent(jButton1)
            .addContainerGap(334, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(94, 94, 94)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(103, 103, 103)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel2)
                .addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(78, 78, 78)
            .addComponent(jButton1)
            .addContainerGap(39, Short.MAX_VALUE))
    );

    pack();
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
   Username = jTextField1.getText();
   Password = jPasswordField1.getText();
 loginconnection c1 = new loginconnection();
  //c1.openconnection();
  //msg = c1.querydetails(Userid , Password);



   /* if(Userid.equals("mohit")&&Password.equals("abc"))
       {
      firstpage b=new firstpage();
      b.setVisible(true);
      this.dispose();    
       }
   else
   {
       System.out.println("wrong");
       System.exit(1);
    }*/
}                                        

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {

        public void run() {
            new loginpage().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.JPasswordField jPasswordField1;
private javax.swing.JTextField jTextField1;
// End of variables declaration

}

2)login connection with the database(this is made in java class)

public class loginconnection { public static void main(String[] args) {

   try
   {

Connection con = null; Statement stmt = null; String querydetails = null;

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); con = DriverManager.getConnection("jdbc:odbc:mohit");

      stmt=con.createStatement();
      stmt.executeUpdate("select * from stud1 where Username = 'at'");
   }
  catch(Exception e3)
  {
      System.out.println(e3);              
  }   

}

}


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View Answers

August 17, 2011 at 11:52 AM


import javax.swing.*;
import java.sql.*;
import java.awt.*;
import java.awt.event.*;

class LoginDemo extends JFrame{
 JButton SUBMIT;
 JLabel label1,label2;
 final JTextField  text1,text2;
  LoginDemo(){
    setTitle("Login Form");
    setLayout(null);
    label1 = new JLabel();
    label1.setText("Username:");
    text1 = new JTextField(15);

    label2 = new JLabel();
    label2.setText("Password:");
    text2 = new JPasswordField(15);

    SUBMIT=new JButton("SUBMIT");
    label1.setBounds(350,100,100,20);
    text1.setBounds(450,100,200,20);
    label2.setBounds(350,130,100,20);
    text2.setBounds(450,130,200,20);
    SUBMIT.setBounds(450,160,100,20);
    add(label1);
    add(text1);
    add(label2);
    add(text2);
    add(SUBMIT);

   setVisible(true);
   setSize(1024,768);

 SUBMIT.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent ae){
    String value1=text1.getText();
    String value2=text2.getText();
    try{
    Class.forName("com.mysql.jdbc.Driver");
           Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
           Statement st=con.createStatement();
           ResultSet rs=st.executeQuery("select * from login where username='"+value1+"' and password='"+value2+"'");
           int count=0;
           while(rs.next()){
               count++;
           }
    if(count>0){
     JOptionPane.showMessageDialog(null,"Welcome "+value1+" !");
       }
    else{
     JOptionPane.showMessageDialog(null,"Error!");
     text1.setText("");
     text2.setText("");
     }
    }
    catch(Exception e){}
}
 });
  }
  public static void main(String arg[]){
  new LoginDemo();
}
}


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