select.java

银行管理系统

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.Toolkit;

public class Select extends JFrame implements ActionListener{

	JLabel	_show,welcome,welcome1,welcome2,_empty;
	JPanel _jp1,_jp2,_jp3,_jp4,_jp5;
	JButton _get,_add,_query,_rework,_exit;
	String name,username,password;
	
    public Select(String username,String password) {
    	super("欢迎您!");
    	this.username = username;
    	this.password = password;
    	name = username;
    	_show = new JLabel("欢迎您  "+name+"  先生/女士");
    	welcome = new JLabel("欢迎您登录本行自动取款系统");
    	welcome1= new JLabel("本行采取的是世界定级的安全技术,24小时监控");
    	welcome2= new JLabel("保证您的信用卡不会被黑~~~~");
    	_empty = new JLabel();
    	_query = new JButton("查询余额");
    	_query.addActionListener(this);
    	_add = new JButton("存款");
    	_add.addActionListener(this);
    	_get = new JButton("取款");
    	_get.addActionListener(this);
    	_rework = new JButton("修改密码");
    	_rework.addActionListener(this);
    	_exit = new JButton("退出");
    	_exit.addActionListener(this);
    	_jp1 = new JPanel(new GridLayout(4,1));
    	_jp2 = new JPanel(new GridLayout(3,1));
    	_jp3 = new JPanel(new GridLayout(3,1));
    	_jp4 = new JPanel();
    	_jp5 = new JPanel();
    	_jp1.add(_show);
    	_jp1.add(welcome);
    	_jp1.add(welcome1);
    	_jp1.add(welcome2);
    	_jp2.add(_query);
    	_jp2.add(_add);
    	_jp2.add(_get);
    	_jp3.add(_empty);
    	_jp3.add(_rework);
    	_jp3.add(_exit);
    	
    	add(_jp1,"North");
    	_jp4.add(_jp2);
    	_jp5.add(_jp3);
    	add(_jp4,"West");
    	add(_jp5,"East");
    	pack();
    	setResizable(false);
    	setVisible(true);
    	int W = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth();
    	int H = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();
    	this.setLocation((W-this.getWidth())/2,(H-this.getHeight())/2);
    	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    private boolean isDigitString(String s){
    	boolean b = true;
    	for (int i = 0; i<s.length(); i++){
    		char c= s.charAt(i);
    		if(!Character.isDigit(c)){
    			b = false;
    			break;
    		}
    	}
    	return b;
    }
    
    public void actionPerformed(ActionEvent e){
    	if(e.getSource()==_query)
    	{
    		double  balance = new DB().queryBalance(username,password);
    			JOptionPane.showMessageDialog(this,""+balance+"");
    	}
    	if(e.getSource()==_add)
    	{
    		String addmoney = JOptionPane.showInputDialog(this,"存款","0.0");
		if(addmoney==null)
    		{
    			JOptionPane.showMessageDialog(this,"您的操作有误!");
    		}else{
    		if(isDigitString(addmoney))
    		{
    			double money = Integer.parseInt(addmoney);
    			new DB().addMoney(username,password,money);	
    			JOptionPane.showMessageDialog(this,"操作成功!");
    		}
    		else
    		{
    				JOptionPane.showMessageDialog(this,"您的操作有误!");
    				}}
    	}
    	if(e.getSource()==_get)
    	{
    		DB db = new DB();
    		String addmoney = JOptionPane.showInputDialog(this,"您有"+db.queryBalance(username,password)+"人民币","0.0");
    		if(isDigitString(addmoney))
    		{
    			double money = Integer.parseInt(addmoney);
    			if(db.queryBalance(username,password)>=money)
    			{
    			new DB().getMoney(username,password,money);	
    			JOptionPane.showMessageDialog(this,"操作成功!");	
    			}
			else
    			{
    				JOptionPane.showMessageDialog(this,"操作失败!");
    			}
    		}
    	}
    	if(e.getSource()==_rework)
    	{
    		DB db = new DB();
    		String repassword = JOptionPane.showInputDialog(this,"");
    		if(repassword==null)
    		{
    			JOptionPane.showMessageDialog(this,"取消成功!");
    		}
			else
			{
			new DB().rework(username,repassword);
			if(db.rework(username,repassword)==repassword)
			{
			JOptionPane.showMessageDialog(this,"修改成功"+'\n'+"请重新登陆！");
    		dispose();
    		new Login();	
			}	
		}
    	}
    	if(e.getSource()==_exit)
    	{
    		System.exit(0);
    	}
    }
}