java学生成绩管理系统源码（java学生信息管理 java成绩管理系统 java学生信息管理系统）
public Swingtest002() {// 设置标题setTitle("请登陆");// 绝对布局setLayout(null);// 定义一个容器Container c = getContentPane();// 创建"用户名:"标签JLabel jl1 = new JLabel("用户名：");// 创建文本框final JTextField jtf1 = new JTextField();// 创建"密码:"标签JLabel jl2 = new JLabel("密码:");// 创建密码框final JPasswordField jpf1 = new JPasswordField();// 设置密码字符为*jpf1.setEchoChar('*');// 创建"提交"按钮JButton jb1 = new JButton("提交");// 创建"重置"按钮JButton jb2 = new JButton("重置");// 当用户名为"mr",密码为"mrsoft"时点击"提交"按钮弹出"登录成功"提示对话框jb1.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String name=(String)jtf1.getText().trim();String password=new String(jpf1.getText().trim());String sql="select * from user where name='"+name+"' and pass='"+password+"'";System.out.println("name"+name+"password"+password);// TODO Auto-generated method stubtry {ResultSet rs=st.executeQuery(sql);if (rs.next()) {JOptionPane.showMessageDialog(null, "登陆成功！");this.setVisible(false);//关闭当前的窗体MainFrame mainframe=new MainFrame();} else if (jtf1.getText().trim().length() == 0 || new String(jpf1.getPassword()).trim().length() == 0) {JOptionPane.showMessageDialog(null, "不能为空!");} else {JOptionPane.showMessageDialog(null, "错误");// 清零jtf1.setText("");jpf1.setText("");}} catch (HeadlessException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (SQLException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}private void setVisible(boolean b) {// TODO Auto-generated method stub}});
