abt java 1 Answer(s) 2 years and 10 months ago
Posted in : Java Beginners
hiiiii i m new to this language i have some problem with my java code ... i working on netbeans .. i write a code for user authetication ... in this code it take user name password and a user certificate(which is given by master ) the problem is this that when i run this desktop application on netbeans its works but when i run this by commmand prompt or by double clickin on jar file it gives wrong out put and says certificate is tempered .. i found out that when it reads that file by executing in netbeans it reads its correctly but when i run this program by command prompt the file contents change ... i dnt know why ... plz help
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August 6, 2010 at 12:43 PM
Hi Friend,
It seems that you haven't set the Path variable in Environment Variables. Anyways we are sending you the Login Code in swings.
import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.sql.*; class LoginDemo extends JFrame{ JButton SUBMIT; JPanel panel; JLabel label1,label2; final JTextField text1; final JPasswordField text2; LoginDemo(){ label1 = new JLabel(); label1.setText("UserName:"); text1 = new JTextField(15); label2 = new JLabel(); label2.setText("Password:"); text2 = new JPasswordField(15); SUBMIT=new JButton("Login"); panel=new JPanel(new GridLayout(4,2)); panel.add(label1); panel.add(text1); panel.add(label2); panel.add(text2); panel.add(SUBMIT); add(panel,BorderLayout.CENTER); SUBMIT.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent ae){ String value1=text1.getText(); String value2=text2.getText(); String user1=""; String pass1=""; try{ Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root"); Statement st = con.createStatement(); ResultSet res = st.executeQuery("SELECT * FROM login where username='"+value1+"' && password='"+value2+"'"); while (res.next()) { user1 = res.getString("username"); pass1 = res.getString("password"); } if (value1.equals(user1) && value2.equals(pass1)) { JOptionPane.showMessageDialog(null,"Welcome"); } else{ JOptionPane.showMessageDialog(null,"Incorrect login or password","Error",JOptionPane.ERROR_MESSAGE); } } catch(Exception e){ System.out.println(e.getMessage()); } } }); } public static void main(String arg[]) { LoginDemo frame=new LoginDemo(); frame.pack(); frame.setVisible(true); } }
Thanks
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