loginui.java

ibatis + sqlserver 学生成绩管理

package ui;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import bean.User;
import dao.IUserDAO;
import dao.IUserDAOImpl;

public class LogInUI {
	private static final long serialVersionUID = -6646173435421766907L;
	private JTextField username;
	private JPasswordField passwordField;
	private JLabel labName, labPassword;
	private JButton butConfirm, butCancel;
	private MainUI mainUI = new MainUI();
	private JFrame frame;

	public LogInUI() {
		frame = new JFrame("请登录...");
		frame.setSize(300, 120);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		Dimension scrSize = Toolkit.getDefaultToolkit().getScreenSize();
		frame.setLocation((scrSize.width - frame.getSize().width) / 2,
				(scrSize.height - frame.getSize().height) / 2);

		Container contentPane = frame.getContentPane();
		contentPane.setLayout(new GridLayout(3, 2));

		labName = new JLabel("请输入用户名：");
		contentPane.add(labName);
		username = new JTextField(10);
		username.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				loginAction();
			}
		});
		contentPane.add(username);

		labPassword = new JLabel("请输用户入密码：");
		contentPane.add(labPassword);
		passwordField = new JPasswordField();
		passwordField.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				loginAction();
			}
		});
		contentPane.add(passwordField);

		butConfirm = new JButton("确定");
		butConfirm.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent event) {
				loginAction();
			}
		});
		contentPane.add(butConfirm);

		butCancel = new JButton("取消");
		butCancel.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent event) {
				username.setText("");
				passwordField.setText("");
			}
		});
		contentPane.add(butCancel);

		frame.setVisible(true);
	}

	private boolean validate(String username, String password) {
		IUserDAO userDAO = new IUserDAOImpl();
		List<User> list = userDAO.queryUserByName(username);
		for (User o : list) {
			if (username.equals(o.getUsername().trim())
					&& password.equals(o.getPassword().trim()))
				return true;
		}
		return false;
	};

	private void loginAction() {
		String password = new String(passwordField.getPassword());
		if (username.getText().trim().equals("")) {
			JOptionPane.showMessageDialog(null, "用户名不能为空！ 请重试！");
			return;
		}
		if (password.equals("")) {
			JOptionPane.showMessageDialog(null, "密码不能为空！ 请重试！");
			return;
		}
		if (validate(username.getText(), String.valueOf(passwordField
				.getPassword()))) {
			JOptionPane.showMessageDialog(null, "祝贺你：" + username.getText()
					+ "，陆成功了哦！");
			mainUI.setVisible(true);
			frame.dispose();
			return;
		} else {
			JOptionPane.showMessageDialog(null, "密码不正确！ 请重试！");
			passwordField.setText("");
		}
	}

	public static void main(String args[]) {
		new LogInUI();
	}
}