一个JAVA开发的ATM模拟系统

package atm; import java.awt.BorderLayout; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JFrame; import java.awt.GridBagLayout; import javax.swing.JLabel; import java.awt.GridBagConstraints; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.text.DateFormat; import javax.swing.JTextField; import javax.swing.JButton; import mysql.Sql; public class Transfer extends JFrame { private static final long serialVersionUID = 1L; private JPanel jContentPane = null; private JPanel jPanel = null; private JLabel jLabel = null; private JTextField jTextField = null; private JLabel jLabel2 = null; private JTextField jTextField2 = null; private JButton jButton = null; private JButton jButton1=null; private JPanel getJPanel() { if (jPanel == null) { GridBagConstraints gridBagConstraints8 = new GridBagConstraints(); gridBagConstraints8.gridx = 1; gridBagConstraints8.gridy = 4; GridBagConstraints gridBagConstraints5 = new GridBagConstraints(); gridBagConstraints5.fill = GridBagConstraints.VERTICAL; gridBagConstraints5.gridy = 2; gridBagConstraints5.weightx = 1.0; gridBagConstraints5.gridx = 1; GridBagConstraints gridBagConstraints4 = new GridBagConstraints(); gridBagConstraints4.gridx = 0; gridBagConstraints4.gridy = 2; jLabel2 = new JLabel(); jLabel2.setText("请输入转帐金额："); GridBagConstraints gridBagConstraints1 = new GridBagConstraints(); gridBagConstraints1.fill = GridBagConstraints.VERTICAL; gridBagConstraints1.gridy = 0; gridBagConstraints1.weightx = 1.0; gridBagConstraints1.gridx = 1; GridBagConstraints gridBagConstraints = new GridBagConstraints(); gridBagConstraints.gridx = 0; gridBagConstraints.gridy = 0; GridBagConstraints gridBagConstraints3 = new GridBagConstraints(); gridBagConstraints3.gridx = 1; gridBagConstraints3.gridy = 5; jLabel = new JLabel(); jLabel.setText("请输入收款人帐号："); jPanel = new JPanel(); jPanel.setLayout(new GridBagLayout()); jPanel.add(jLabel, gridBagConstraints); jPanel.add(getJTextField(), gridBagConstraints1); jPanel.add(jLabel2, gridBagConstraints4); jPanel.add(getJTextField2(), gridBagConstraints5); jPanel.add(getJButton(), gridBagConstraints8); jPanel.add(getJButton1(), gridBagConstraints3); } return jPanel; } private JTextField getJTextField() { if (jTextField == null) { jTextField = new JTextField(); jTextField.setColumns(18); } return jTextField; } private JTextField getJTextField2() { if (jTextField2 == null) { jTextField2 = new JTextField(); jTextField2.setColumns(8); } return jTextField2; } private JButton getJButton() { if (jButton == null) { jButton = new JButton(); jButton.setText("确定"); jButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent e) { System.out.println("actionPerformed()"); try{ con=db.getConn(); st=con.createStatement(); ResultSet rs=db.executeQuery("select * from cardInfo where cardID='"+Login.cardID+"'"); String aa=String.valueOf(jTextField2.getText()); String bb=String.valueOf(jTextField.getText()); if(aa.equals("")||bb.equals("")) { JOptionPane.showMessageDialog(null, "输入用户名或金额不能为空！"); Transfer transfer=new Transfer(); transfer.setVisible(true); close(); } else { int a=Integer.parseInt(aa); if(rs.next()){ int ia=Integer.parseInt(rs.getString("balance")); if(ia>10000) { JOptionPane.showMessageDialog(null,"转账上限金额不能超过10000！"); } else { if(ia>a){ int i=Integer.parseInt(rs.getString("balance"))-a; String time=DateFormat.getDateTimeInstance(2,2,getLocale()).format(new java.util.Date()); db.executeUpdate("update cardInfo set balance='"+i+"' where cardID='"+Login.cardID+"'"); int ii=Integer.parseInt(rs.getString("balance"))+a; db.executeUpdate("update cardInfo set balance='"+ii+"' where cardID='"+jTextField.getText()+"'"); if(db.executeUpdateSQL("insert transInfo (transDate,transMoney,transType,cardID) values ( '"+time+"','"+aa+"','"+"转账"+"','"+Login.cardID+"')")) javax.swing.JOptionPane.showMessageDialog(null, "转帐成功！"); rs.close(); Operate um=new Operate(); um.setVisible(true); close(); } else { JOptionPane.showMessageDialog(null, "金额不足不能转账"); } } } } } catch(SQLException ee){ ee.printStackTrace(); } } }); } return jButton; } private JButton getJButton1() { if (jButton1 == null) { jButton1 = new JButton(); jButton1.setText("返回"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent e) { Operate um=new Operate(); um.setVisible(true); close(); } }); } return jButton1; } Sql db=new Sql(); Connection con; ResultSet rs; Statement st; public void close(){ this.setVisible(false); } public Transfer() { super(); initialize(); } private void initialize() { this.setSize(350, 200); this.setContentPane(getJContentPane()); this.setContentPane(getJContentPane()); this.setTitle("用户转帐窗"); this.setLocation(400, 200); this.setResizable(false); this.addWindowListener(new java.awt.event.WindowAdapter() { public void windowClosing(java.awt.event.WindowEvent e) { System.out.println("windowClosing()"); int a; a=JOptionPane.showConfirmDialog(null,"确实要退出吗？","退出程序",JOptionPane.YES_NO_OPTION); System.out.println(a); if(a==JOptionPane.YES_OPTION){ JOptionPane.showMessageDialog(null, "安全退出"); System.exit(-1); } else{ Transfer dn=new Transfer(); dn.setVisible(true); } } }); } private JPanel getJContentPane() { if (jContentPane == null) { jContentPane = new JPanel(); jContentPane.setLayout(new BorderLayout()); jContentPane.add(getJPanel(), BorderLayout.CENTER); } return jContentPane; } }