cartframe.java

购物车模块实例。购物车模块可以浏览商品类别；可以根据商品类别浏览商品信息；可以购买商品；可以查看购物车的商品；可以修改购买商品的数量和删除购买的商品。

package cartinterface;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import com.borland.dx.dataset.*;
import com.borland.dbswing.*;
import data.*;
import java.util.Hashtable;

public class CartFrame extends JFrame implements ActionListener {
  JPanel contentPane;
  //创建数据类
  TableDataSet categoryDataSet = new TableDataSet();
  TableDataSet productDataSet = new TableDataSet();
  //创建数据表格
  JdbTable categoryDBTable = new JdbTable();
  JdbTable productDBTable = new JdbTable();
  //创建滚动框
  TableScrollPane categoryTableScrollPane = new TableScrollPane();
  TableScrollPane productTableScrollPane = new TableScrollPane();
  JSplitPane jSplitPane1 = new JSplitPane();
  BorderLayout borderLayout1 = new BorderLayout();
  JPanel jPanel1 = new JPanel();
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();
  JButton jButton3 = new JButton();
  //创建字体类
  Font dialog13 = new java.awt.Font("Dialog", 0, 13);
  //创建数据模块
  CartDataModule cartDataModule1;
  //创建购物车类
  Cart cart = null;
  //声明购物车窗口对象
  CartViewFrame cartViewFrame = null;

  public CartFrame(Cart cart) {
    //取得传入的购物车对象
    this.cart = cart;
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  private void jbInit() throws Exception  {
    //设置窗口面板的布局、大小与标题
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(685, 530));
    this.setTitle("商品浏览窗口");
    //创建数据模块
    cartDataModule1 = new CartDataModule();
    //取得数据模块的数据类
    categoryDataSet = cartDataModule1.getCategoryDataSet();
    productDataSet = cartDataModule1.getProductDataSet();
    //设置数据表格的数据源
    categoryDBTable.setDataSet(categoryDataSet);
    productDBTable.setDataSet(productDataSet);
    //设置数据表格的字体
    categoryDBTable.setFont(dialog13);
    productDBTable.setFont(dialog13);
    //使表格的选择范围为一个单元格
    productDBTable.setRowSelectionAllowed(false);
    //将数据表格加入滚动框
    categoryTableScrollPane.getViewport().add(categoryDBTable, null);
    productTableScrollPane.getViewport().add(productDBTable, null);
    //设置按钮属性
    jButton1.setActionCommand("buy");
    jButton1.setText("将选择商品放入购物车");
    jButton1.setFont(dialog13);
    jButton1.addActionListener(this);
    jButton2.setText("查看购物车");
    jButton2.setActionCommand("viewCart");
    jButton2.setFont(dialog13);
    jButton2.addActionListener(this);
    jButton3.setText("退出");
    jButton3.setActionCommand("exit");
    jButton3.setFont(dialog13);
    jButton3.addActionListener(this);
    //定义分隔面板的分隔条大小
    jSplitPane1.setDividerSize(6);
    //定义分隔面板的分隔条的位置
    jSplitPane1.setDividerLocation(180);
    //将分隔面板定义为上下方向
    jSplitPane1.setOrientation(JSplitPane.VERTICAL_SPLIT);
    //为分隔面板的顶部加入category滚动框
    jSplitPane1.add(categoryTableScrollPane, JSplitPane.TOP);
    //为分隔面板的底部加入product滚动框
    jSplitPane1.add(productTableScrollPane, JSplitPane.BOTTOM);
    contentPane.add(jPanel1, BorderLayout.NORTH);
    jPanel1.add(jButton1, null);
    jPanel1.add(jButton2, null);
    jPanel1.add(jButton3, null);
    //为窗口面板加入分隔面板
    contentPane.add(jSplitPane1, BorderLayout.CENTER);
    //创建购物车窗口
    cartViewFrame = new CartViewFrame(cart);
    //使购物车窗口的位置居中对齐
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = cartViewFrame.getSize();
    if (frameSize.height > screenSize.height) {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {
      frameSize.width = screenSize.width;
    }
    cartViewFrame.setLocation( (screenSize.width - frameSize.width) / 2,
                              (screenSize.height - frameSize.height) / 2);
  }
  protected void processWindowEvent(WindowEvent e) {
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
  //按钮单击方法
  public void actionPerformed(ActionEvent e) {
    //取得按钮的动作字符串
    String actionCommand = e.getActionCommand().trim();
    //单击将选择商品放入购物车按钮的处理代码
    if (actionCommand.equals("buy")) {
      //创建购买商品集合
      Hashtable goods = new Hashtable();
      for(int i = 0; i < productDBTable.getRowCount(); i++){
        if(productDBTable.getValueAt(i, 4) != null){
          //取得是否购买列的数据
          boolean isSelected = ( (Boolean) productDBTable.getValueAt(i, 4)).
              booleanValue();
          if (isSelected) {
            //检验购买数量列是否是整数并且数字是否大于等于0
            if(!(new NumberVerify().verifyNum(
                productDBTable.getValueAt(i, 5).toString()))){
              JOptionPane.showMessageDialog(null, productDBTable.getValueAt(i, 1)
                                            + "的购买数量需要输入整数并且大于等于0.");
              //不再执行其它代码
              return;
            }
            String good = productDBTable.getValueAt(i, 1) + "@@" + productDBTable.
                getValueAt(i, 2) + "@@" + productDBTable.getValueAt(i, 3)
                + "@@" + productDBTable.getValueAt(i, 5);
            //将购买商品放入集合类
            goods.put(productDBTable.getValueAt(i, 0).toString(), good);
          }
        }
      }
      //将购买商品集合放入购物车
      cart.addGoods(goods);
      //更新购物车窗口的购物车类
      cartViewFrame.cart = cart;
      //重新显示购物车窗口的表格
      cartViewFrame.showTable();
    //单击查看购物车按钮的处理代码
    }else if(actionCommand.equals("viewCart")){
      //显示购物车窗口
      cartViewFrame.setVisible(true);
    }else if(actionCommand.equals("exit")){
      System.exit(0);
    }
  }
}