loginjdialog.java

电子通讯录实现网上保存朋友

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * LoginJDialog.java
 *
 * Created on 2008-12-23, 11:20:29
 */

package frame;

import java.awt.Dimension;
import java.awt.Toolkit;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import utils.UIUtils;

/**
 *
 * @author Jason
 */
public class LoginJDialog extends javax.swing.JDialog {

    /** Creates new form LoginJDialog */
    public LoginJDialog(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        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">//GEN-BEGIN:initComponents
    private void initComponents() {

        usernameJLbl = new javax.swing.JLabel();
        usernameJTxt = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        jPasswordField1 = new javax.swing.JPasswordField();
        loginJBtn = new javax.swing.JButton();
        exitJBtn = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setTitle("欢迎使用电子通讯录");

        usernameJLbl.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
        usernameJLbl.setText("用户名：");

        usernameJTxt.setText("admin");

        jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
        jLabel2.setText("密码：");

        loginJBtn.setText("登录");
        loginJBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                loginJBtnActionPerformed(evt);
            }
        });

        exitJBtn.setText("退出");
        exitJBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                exitJBtnActionPerformed(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()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(loginJBtn)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(exitJBtn))
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(usernameJLbl)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(usernameJTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 189, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jLabel2)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addContainerGap())
        );

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jLabel2, usernameJLbl});

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jPasswordField1, usernameJTxt});

        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(usernameJLbl)
                    .addComponent(usernameJTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .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))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(loginJBtn)
                    .addComponent(exitJBtn))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void exitJBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_exitJBtnActionPerformed
        // TODO add your handling code here:
        System.exit(0);

}//GEN-LAST:event_exitJBtnActionPerformed

    private void loginJBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_loginJBtnActionPerformed
        try {
            // TODO add your handling code here:
            String username = this.usernameJTxt.getText();
            if (username.trim().length() == 0) {
                JOptionPane.showMessageDialog(this, "用户名不能为空！", "警告",
                        JOptionPane.WARNING_MESSAGE);
                return;
            }
            String pwd = String.valueOf(this.jPasswordField1.getPassword());
            if (pwd.trim().length() == 0) {
                JOptionPane.showMessageDialog(this, "密码不能为空！");
                return;
            }
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection(
                     "jdbc:mysql://localhost:3306/eabook",
                     "root","root"
                    );
            Statement stmt = con.createStatement();
            String sql = "select * from t_userinfo where username = '"
                    + username + "' and pwd = '" + pwd + "'";
            System.out.print(sql);
            ResultSet rs = stmt.executeQuery(sql);
            if(rs.next()){
                JOptionPane.showMessageDialog(this,"登录成功！");
                this.dispose();
                RecordJFrame recordJFrame = new RecordJFrame();
                recordJFrame.setVisible(true);
            }else{
                JOptionPane.showMessageDialog(this, "用户名或密码有误，请检查！");
            }
            if(stmt != null){
                stmt.close();
            }
            if(con != null){
                con.close();
            }

        } catch (SQLException ex) {
            Logger.getLogger(LoginJDialog.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(LoginJDialog.class.getName()).log(Level.SEVERE, null, ex);
        }




    }//GEN-LAST:event_loginJBtnActionPerformed

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(
                        "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
                    LoginJDialog dialog = new LoginJDialog(new javax.swing.JFrame(), true);
                    dialog.addWindowListener(new java.awt.event.WindowAdapter() {
                        public void windowClosing(java.awt.event.WindowEvent e) {
                            System.exit(0);
                        }
                    });
//                Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
//                int x = (screenSize.width - dialog.getWidth())/2;
//                int y = (screenSize.height - dialog.getHeight())/2;
//                dialog.setLocation(x,y);
                    UIUtils.setComponentAtScreenCenter(dialog);
                    dialog.setVisible(true);
                } catch (ClassNotFoundException ex) {
                    Logger.getLogger(LoginJDialog.class.getName()).log(Level.SEVERE, null, ex);
                } catch (InstantiationException ex) {
                    Logger.getLogger(LoginJDialog.class.getName()).log(Level.SEVERE, null, ex);
                } catch (IllegalAccessException ex) {
                    Logger.getLogger(LoginJDialog.class.getName()).log(Level.SEVERE, null, ex);
                } catch (UnsupportedLookAndFeelException ex) {
                    Logger.getLogger(LoginJDialog.class.getName()).log(Level.SEVERE, null, ex);
                }

            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton exitJBtn;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JPasswordField jPasswordField1;
    private javax.swing.JButton loginJBtn;
    private javax.swing.JLabel usernameJLbl;
    private javax.swing.JTextField usernameJTxt;
    // End of variables declaration//GEN-END:variables

}