java开发的商店收银系统

package showframe; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.sql.*; import businesslogic.ShopLogic; import dao.ShoppingListDAO;; public class Shopframe extends JFrame implements ActionListener { JLabel l1,l2,l3,l4,l5,l6,l7; JTextField t1,t2,t3,t4,t5,t6; JButton b1,b2,b3; JPanel p1,p2,p3,p4; JScrollPane sp; JTable ta; String userid; String id; String m; int number; private ShopLogic shoplogic=new ShopLogic(); String[] colNames={"用户ID","商品ID","商品名称","数目","单价",}; String[][] shopList=new String[20][5]; private ShoppingListDAO shdao=new ShoppingListDAO(); public Shopframe(){ Container c=this.getContentPane(); c.setLayout(new BorderLayout()); l1=new JLabel("用户ID:"); l2=new JLabel("商品ID:"); l3=new JLabel("商品个数:"); l4=new JLabel("应收:"); l5=new JLabel("实付:"); l6=new JLabel("找零:"); t1=new JTextField(10); t1.setEditable(false); t2=new JTextField(10); t3=new JTextField(10); t4=new JTextField(10); t4.setEditable(false);//不可编辑 t5=new JTextField(10); t6=new JTextField(10); t6.setEditable(false); b1=new JButton("确定"); b2=new JButton("结帐"); b3=new JButton("退出"); ta=new JTable(shopList,colNames); p1=new JPanel(); p2=new JPanel(); p3=new JPanel(); p4=new JPanel(new GridLayout(3,1,0,0)); sp=new JScrollPane(ta, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); p1.setBounds(0,5,500,25); p2.setBounds(0,30,500,50); sp.setBounds(0,80, 500, 220); p1.add(l1); p1.add(t1); p1.add(b3); p2.add(l2); p2.add(t2); p2.add(l3); p2.add(t3); p2.add(b1); p2.add(b2); p3.add(l4); p3.add(t4); p3.add(l5); p3.add(t5); p3.add(l6); p3.add(t6); p4.add(p1); p4.add(p2); p4.add(p3); c.add(p4,"North"); //c.add(p2,"Center"); c.add(sp); //c.add(p3,"South"); sp.setBorder(BorderFactory.createTitledBorder("商品清单")); this.setTitle("购物车"); this.setBounds(300, 100, 500, 300); this.setVisible(true); b1.addActionListener(this); b2.addActionListener(this); b3.addActionListener(this); } public void actionPerformed(ActionEvent e){ Object src=e.getSource(); int i=(int)(Math.random()*10000000); userid=Integer.toString(i); t1.setText(userid); id=t2.getText().trim(); String st=t3.getText().trim(); number=Integer.parseInt(st); ResultSet rs; int k=0; if(src==b1){ rs=shdao.executeQuery(id); try{ if(rs.next()){ shoplogic.checkout(userid,id,number); shoplogic.purchase(userid, id, number); Double.parseDouble(t5.getText()); String str=Double.toString(shoplogic.checkout(userid,id,number)); t4.setText(str); shopList[k][0] = rs.getString(1); shopList[k][1] = rs.getString(2); shopList[k][2] = rs.getString(3); shopList[k][3] = rs.getString(4); shopList[k][4] = rs.getString(5); k++; } else{ JOptionPane.showMessageDialog(this, "对不起，商品不存在！", "警告", JOptionPane.INFORMATION_MESSAGE); } }catch(SQLException ee){ System.err.println(ee.getMessage()); } ta.repaint(); } if(src==b2){ Double t=Double.parseDouble(t5.getText())-shoplogic.checkout(userid,id,number); if(t<0){ JOptionPane.showMessageDialog(this, "对不起，您付的钱不不足！", "警告", JOptionPane.INFORMATION_MESSAGE); }else{ String sn=Double.toString(t); t6.setText(sn); } } if(src==b3){ System.exit(0); } } public static void main(String args[]){ new Shopframe(); } }