loginframe.java

商品销售管理系统工程代码

package logininterface;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import method.*;
import goodsinterface.*;

public class LoginFrame extends JFrame implements ActionListener {
  JPanel contentPane;
  JLabel nameLabel = new JLabel();
  JLabel passwordLabel = new JLabel();
  JLabel userCategoryLabel = new JLabel();
  JTextField nameTextField = new JTextField();
  JPasswordField passwordField = new JPasswordField();
  JButton loginBtn = new JButton();
  JButton exitBtn = new JButton();
  JComboBox stateComboBox = new JComboBox();

  public LoginFrame() {
    try {jbInit();}
    catch(Exception e) {e.printStackTrace();}
  }

  private void jbInit() throws Exception  {
    //取得窗口面板
    contentPane = (JPanel) this.getContentPane();
    //定义窗口面板的布局
    contentPane.setLayout(null);
    //定义窗口的大小和标题
    this.setSize(new Dimension(400, 330));
    this.setTitle("登陆模块");
    //定义标签的标题、字符大小和位置
    nameLabel.setText("用户名：");
    nameLabel.setFont(new java.awt.Font("Dialog", 0, 15));
    nameLabel.setBounds(new Rectangle(65, 67, 81, 16));
    passwordLabel.setText("密码：");
    passwordLabel.setFont(new java.awt.Font("Dialog", 0, 15));
    passwordLabel.setBounds(new Rectangle(65, 112, 79, 16));
    userCategoryLabel.setText("用户类别：");
    userCategoryLabel.setFont(new java.awt.Font("Dialog", 0, 15));
    userCategoryLabel.setBounds(new Rectangle(65, 156, 79, 16));
    //定义编辑框的位置
    nameTextField.setBounds(new Rectangle(194, 67, 118, 22));
    passwordField.setBounds(new Rectangle(194, 112, 118, 22));
    //定义按钮的标题、动作字符串、字符大小、位置和加入动作接收器
    loginBtn.setText("登陆");
    loginBtn.setActionCommand("login");
    loginBtn.setFont(new java.awt.Font("Dialog", 0, 15));
    loginBtn.setBounds(new Rectangle(65, 224, 109, 25));
    loginBtn.addActionListener(this);
    exitBtn.setText("退出");
    exitBtn.setActionCommand("exit");
    exitBtn.setFont(new java.awt.Font("Dialog", 0, 15));
    exitBtn.setBounds(new Rectangle(203, 224, 109, 25));
    exitBtn.addActionListener(this);
    //定义下拉列表框的内容、第1个显示项和位置
    stateComboBox.addItem("管理员");
    stateComboBox.addItem("用户");
    stateComboBox.setSelectedIndex(0);
    stateComboBox.setBounds(new Rectangle(194, 158, 118, 22));
    //为面板加入各个控件
    contentPane.add(nameLabel, null);
    contentPane.add(nameTextField, null);
    contentPane.add(passwordLabel, null);
    contentPane.add(passwordField, null);
    contentPane.add(userCategoryLabel, null);
    contentPane.add(stateComboBox, null);
    contentPane.add(loginBtn, null);
    contentPane.add(exitBtn, null);
  }

  protected void processWindowEvent(WindowEvent e) {
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  //按钮单击事件处理代码
  public void actionPerformed(ActionEvent e) {
    //取得按钮的动作字符串
    String actionCommand = e.getActionCommand().trim();
    //取得用户名
    String name = nameTextField.getText();
    //取得密码
    String password = new String(passwordField.getPassword());
    //取得用户类别
    int state = stateComboBox.getSelectedIndex();
    //创建返回的字符串
    String message = "";
    if(actionCommand.equals("login")){
      CheckUser login = new CheckUser(name, password, state);
      message = login.checkLogin();
      JFrame frame = null;
      if (message.equals("0")) {
        frame = new GoodsFrame("manager");
      }
      else if (message.equals("1")) {
        frame = new GoodsFrame("user");
      }
      else if (message.equals("-1")) {
        JOptionPane.showMessageDialog(null, "用户名或者密码输入错误。");
      }
      if (message.equals("0") | message.equals("1")) {
        //使窗口居中显示
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension frameSize = frame.getSize();
        frame.setLocation( (screenSize.width - frameSize.width) / 2,
                          (screenSize.height - frameSize.height) / 2);
        frame.setVisible(true);
        //隐藏登陆窗口
        this.setVisible(false);
      }
    }
    if(actionCommand.equals("exit")){
      //清空内存
      System.exit(0);
    }
  }
}