课程管理系统化

[java]代码库
package com.course.UI;
 
import java.awt.BorderLayout;
import java.awt.EventQueue;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
 
import com.course.BLL.UserDao;
import com.course.DAL.DbUtil;
import com.course.DAL.User;
import com.course.UTIL.Alert;
import com.course.UTIL.Tools;
 
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.awt.event.ActionEvent;
import javax.swing.JPasswordField;
 
public class LoginWindow extends JFrame {
 
    private JPanel contentPane;
    private JTextField txt_usn;
    private JPasswordField txt_pwd;
    DbUtil dbUtil=new DbUtil();
    UserDao ud=new UserDao();
 
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    LoginWindow frame = new LoginWindow();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
 
    /**
     * Create the frame.
     */
    public LoginWindow() {
        setTitle("\u7528\u6237\u767B\u5F55");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
         
        JLabel lblNewLabe = new JLabel("课程管理登录系统");
        lblNewLabe.setBounds(105, 30, 126, 35);
        contentPane.add(lblNewLabe);
         
        JLabel lblNewLabel_1 = new JLabel("用户");
        lblNewLabel_1.setBounds(60, 97, 35, 24);
        contentPane.add(lblNewLabel_1);
         
        JLabel lblNewLabel_2 = new JLabel("密码");
        lblNewLabel_2.setBounds(60, 151, 35, 24);
        contentPane.add(lblNewLabel_2);
         
        txt_usn = new JTextField();
        txt_usn.setBounds(105, 99, 152, 22);
        contentPane.add(txt_usn);
        txt_usn.setColumns(10);
         
        JButton btn_login = new JButton(" \u767B\u5F55");
        btn_login.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String usn = txt_usn.getText().trim();
                String pwd = new String(txt_pwd.getPassword()).trim();
                if (Tools.isEmpty(usn)) {
                    Alert.show("用户名不能为空");
                    return;
                }
                if(Tools.isEmpty(pwd)) {
                    Alert.show("密码不能为空");
                    return;
                }
                User user = new User(usn,pwd);
                Connection conn = null;
                try {
                    conn = dbUtil.getCon();
                    if (ud.login(conn, user)!= null)
                    {
                        LoginWindow.this.dispose();
                    new MainWindow().setVisible(true);
                    }
                    else
                        Alert.show("用户名或密码错误！");
                }catch (Exception e) {
                        e.printStackTrace();
                        Alert.show("登陆失败");
                    }finally {
                        try {
                            dbUtil.getClose(conn);
                        }catch (Exception e) {
                            e.printStackTrace();;
                        }
                    }
                 
                 
                }
        });
         
        btn_login.setBounds(66, 213, 74, 23);
        contentPane.add(btn_login);
         
        JButton btn_reset = new JButton(" \u91CD\u7F6E");
        btn_reset.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                txt_usn.setText("");
                txt_pwd.setText("");
            }
        });
        btn_reset.setBounds(205, 213, 74, 23);
        contentPane.add(btn_reset);
         
        txt_pwd = new JPasswordField();
        txt_pwd.setBounds(105, 153, 152, 22);
        contentPane.add(txt_pwd);
     
}
}
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