logindialog.java~33~

简单的信息录入系统 大家可以在这个基础上将其完善 是对初学者的有力帮助

package mvcdemo;

import java.awt.*;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;

public class LoginDialog extends JDialog {
    JPanel panel1 = new JPanel();
    JLabel jLabel1 = new JLabel();
    JLabel jLabel2 = new JLabel();
    JTextField txtName = new JTextField();
    JPasswordField txtPwd = new JPasswordField();
    JButton btnCancel = new JButton();
    JButton btnLogin = new JButton();
    public LoginDialog(Frame owner, String title, boolean modal) {
        super(owner, title, modal);
        try {
            setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    public LoginDialog() {
        this(new Frame(), "LoginDialog", false);
    }

    private void jbInit() throws Exception {
        this.setSize(260, 160);
        panel1.setLayout(null);
        jLabel1.setText("密    码");
        jLabel1.setBounds(new Rectangle(30, 60, 40, 16));
        jLabel2.setText("用户名");
        jLabel2.setBounds(new Rectangle(31, 21, 40, 16));
        txtName.setText("");
        txtName.setBounds(new Rectangle(82, 17, 122, 23));
        txtPwd.setText("");
        txtPwd.setBounds(new Rectangle(80, 56, 124, 24));
        btnCancel.setBounds(new Rectangle(125, 98, 67, 24));
        btnCancel.setText("取消");
        btnCancel.addActionListener(new LoginDialog_btnCancel_actionAdapter(this));
        btnLogin.setBounds(new Rectangle(40, 99, 67, 24));
        btnLogin.setText("登陆");
        btnLogin.addActionListener(new LoginDialog_btnLogin_actionAdapter(this));
        this.addWindowListener(new LoginDialog_this_windowAdapter(this));
        getContentPane().add(panel1);
        panel1.add(jLabel2);
        panel1.add(jLabel1, null);
        panel1.add(txtName);
        panel1.add(txtPwd);
        panel1.add(btnLogin);
        panel1.add(btnCancel);
    }

    public void btnLogin_actionPerformed(ActionEvent e) {
        //取用户名和密码
        String name = txtName.getText();
        String password = new String(txtPwd.getPassword());
        //数据验证
        if (name.equals("") || name == null) {
            JOptionPane.showMessageDialog(this, "用户名不能为空");
            return;
        }
        if (password.equals("") || password == null) {
            JOptionPane.showMessageDialog(this, "密码不能为空");
            return;
        }
        //封装成User对象
        User user = new User();
        user.setName(name);
        user.setPassword(password);
        //调用dao的select方法
        if (UserDAO.select(user)) {
            //显示主窗体
            TableFrame frame = new TableFrame();
            // Center the window
            Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
            Dimension frameSize = frame.getSize();
            if (frameSize.height > screenSize.height) {
                frameSize.height = screenSize.height;
            }
            if (frameSize.width > screenSize.width) {
                frameSize.width = screenSize.width;
            }
            frame.setLocation((screenSize.width - frameSize.width) / 2,
                              (screenSize.height - frameSize.height) / 2);
            frame.setVisible(true);

            //关闭登陆对话框
            this.dispose();
        } else {
            JOptionPane.showMessageDialog(this, "该用户不存在");
        }
    }

    public void this_windowClosing(WindowEvent e) {
        System.exit(0);
    }

    public void btnCancel_actionPerformed(ActionEvent e) {
        int cho = JOptionPane.showConfirmDialog(this,"确定退出么","温馨提示",JOptionPane.OK_CANCEL_OPTION)
        if (cho == JOptionPane.OK_OPTION) {
            System.exit(0);
        }
    }
}


class LoginDialog_this_windowAdapter extends WindowAdapter {
    private LoginDialog adaptee;
    LoginDialog_this_windowAdapter(LoginDialog adaptee) {
        this.adaptee = adaptee;
    }

    public void windowClosing(WindowEvent e) {
        adaptee.this_windowClosing(e);
    }
}


class LoginDialog_btnCancel_actionAdapter implements ActionListener {
    private LoginDialog adaptee;
    LoginDialog_btnCancel_actionAdapter(LoginDialog adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.btnCancel_actionPerformed(e);
    }
}


class LoginDialog_btnLogin_actionAdapter implements ActionListener {
    private LoginDialog adaptee;
    LoginDialog_btnLogin_actionAdapter(LoginDialog adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.btnLogin_actionPerformed(e);
    }
}