JAVA两层架构

package view; import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import java.awt.*; import javax.swing.JButton; import javax.swing.JPasswordField; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import db.DBGet; import bean.User; import db.UserManager; import javax.swing.*; /** * <p>Title: </p> * * <p>Description: </p> * * <p>Copyright: Copyright (c) 2007</p> * * <p>Company: </p> * * @author not attributable * @version 1.0 */ public class LoginFrm extends JFrame { JPanel contentPane; JTextField txtUsername = new JTextField(); JButton btnLogin = new JButton(); JButton btnCancel = new JButton(); JPasswordField pwdLogin = new JPasswordField(); //实例化一个UserManager对象 UserManager objUMana = new UserManager(); public LoginFrm() { try { setDefaultCloseOperation(EXIT_ON_CLOSE); jbInit(); } catch (Exception exception) { exception.printStackTrace(); } } /** * Component initialization. * * @throws java.lang.Exception */ private void jbInit() throws Exception { contentPane = (JPanel) getContentPane(); contentPane.setLayout(null); setSize(new Dimension(400, 300)); setTitle("用户登录"); txtUsername.setText(""); txtUsername.setBounds(new Rectangle(95, 66, 153, 38)); btnLogin.setBounds(new Rectangle(68, 231, 92, 35)); btnLogin.setText("登录"); btnLogin.addActionListener(new LoginFrm_btnLogin_actionAdapter(this)); btnCancel.setBounds(new Rectangle(207, 230, 106, 44)); btnCancel.setText("取消"); pwdLogin.setText(""); pwdLogin.setBounds(new Rectangle(97, 145, 157, 44)); contentPane.add(txtUsername); contentPane.add(btnCancel); contentPane.add(pwdLogin); contentPane.add(btnLogin); } public void btnLogin_actionPerformed(ActionEvent e) { char[] pwd = this.pwdLogin.getPassword(); String password = new String(pwd); User objUser = new User(); objUser.setUsername(this.txtUsername.getText()); objUser.setPassword(password); if (objUMana.isExists(objUser)) { JOptionPane.showMessageDialog(this, "登录成功!", "提示", JOptionPane.INFORMATION_MESSAGE); } else { JOptionPane.showMessageDialog(this, "登录失败!", "提示", JOptionPane.ERROR_MESSAGE); } } } class LoginFrm_btnLogin_actionAdapter implements ActionListener { private LoginFrm adaptee; LoginFrm_btnLogin_actionAdapter(LoginFrm adaptee) { this.adaptee = adaptee; } public void actionPerformed(ActionEvent e) { adaptee.btnLogin_actionPerformed(e); } }