package com.csbook.restaurant;import java.awt.*;import javax.swing.*;import java.awt.event.*;import javax.swing.UIManager;import com.csbook.restaurant.utility.*;/** * <p>Title: </p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2003</p> * <p>Company: </p> * @author pengtao * @version 1.0 */public class LoginSystem extends JDialog {  private int logincount=0;  private JPanel centerPanel = new JPanel();  private JLabel jLabel2 = new JLabel();  private JLabel jLabel3 = new JLabel();  private JPasswordField password = new JPasswordField();  private JTextField username = new JTextField();  private JPanel southPanel = new JPanel();  private JButton login = new JButton();  private GridLayout gridLayout1 = new GridLayout(2,2);  private JPanel northjPanel = new JPanel();  private JLabel jLabel4 = new JLabel();  private CheckUser cUser=new CheckUser();  FlowLayout flowLayout1 = new FlowLayout();  public LoginSystem(Frame frame, String title, boolean modal) {    super(frame, title, modal);    try {      jbInit();      pack();    }    catch(Exception ex) {      ex.printStackTrace();    }  }  public LoginSystem() {    this(null, "登陸系統(tǒng)", false);  }  //初始化用戶界面  private void jbInit() throws Exception {    centerPanel.setLayout(gridLayout1);    jLabel2.setText("用戶名：");    jLabel3.setText("密碼：");    login.setText("登陸系統(tǒng)");    login.addActionListener(new ActionListener(this));    jLabel4.setText("請輸入用戶名和密碼");    northjPanel.setLayout(flowLayout1);    centerPanel.add(jLabel2, null);    centerPanel.add(username, null);    centerPanel.add(jLabel3, null);    centerPanel.add(password, null);    this.getContentPane().add(northjPanel, BorderLayout.NORTH);    northjPanel.add(jLabel4, null);    this.getContentPane().add(southPanel,  BorderLayout.SOUTH);    southPanel.add(login, null);    this.getContentPane().add(centerPanel,  BorderLayout.CENTER);    this.setVisible(true);  }  public void login_actionPerformed(ActionEvent e) {      //取得用戶輸入的用戶名      String operator=username.getText();      //取得用戶輸入的密碼      char temp[]=password.getPassword();      String tempPass=new String(temp);      //檢查用戶是否為合法用戶      if(cUser.isValidUser(operator,tempPass)==false){        JOptionPane.showMessageDialog(this, "錯誤的用戶名或密碼", "錯誤",                                      JOptionPane.WARNING_MESSAGE);        logincount++;        //如果輸入錯誤三次，自動退出系統(tǒng)        if(logincount>=3)          System.exit(1);      }      else{        //初始化系統(tǒng)主界面        MainFrame frame=new MainFrame();        //獲取用戶類型        String userType=cUser.getUserType(operator);        //將主界面置于屏幕中央       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;       }       int inset = 50;      setBounds(inset, inset, screenSize.width - inset*2, screenSize.height-inset*2);      frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);      //將當前用戶的名稱傳送給主界面      frame.setOperator(operator);      //設(shè)置用戶可以使用的功能      frame.setMenuStatus(userType);      //顯示主界面      frame.setVisible(true);      //關(guān)閉登陸窗口      this.dispose();      }  }}class ActionListener implements java.awt.event.ActionListener {  LoginSystem adaptee;  ActionListener(LoginSystem adaptee) {    this.adaptee = adaptee;  }  public void actionPerformed(ActionEvent e) {    adaptee.login_actionPerformed(e);  }}