login.java

使用java弄的,实现铁路售票的各种功能,供大家学习使用

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

public class Login extends JFrame implements ActionListener {

	JLabel _jlid,_jlpass;
	JTextField _jfid;
	JPasswordField _jfpass;
	JButton _jbsub,_jbcan;
	JPanel _jp,_jp2,_jp3;
	String userpopedom = "admin";

    public Login() {
    	super("欢迎登录");
    	JLabel imagelabel = new JLabel();
    	ImageIcon icon = new ImageIcon("images/train.jpg");
    	imagelabel.setIcon(icon);
    	repaint();
    	_jlid = new JLabel("      ID号码  :");
    	_jlpass = new JLabel("      密    码  :");
    	_jfid = new JTextField(8);
    	_jfid.addActionListener(this);
    	_jfpass = new JPasswordField(8);
    	_jfpass.addActionListener(this);
    	_jbsub = new JButton("提交");
    	_jbsub.addActionListener(this);
    	_jbcan = new JButton("取消");
    	_jbcan.addActionListener(this);
    	
    	
    	_jp = new JPanel();
    	_jp2 = new JPanel(new GridLayout(2,2));
    	_jp3 = new JPanel();
    	_jp.add(imagelabel);
    	_jp2.add(_jlid);
    	_jp2.add(_jfid);
    	JPanel _p2 = new JPanel();
    	_jp2.add(_jlpass);
    	_jp2.add(_jfpass);
    	_p2.add(_jp2);
    	_jp3.add(_jbsub);
    	_jp3.add(_jbcan);
    	
    	this.add(_jp,"North");
    	this.add(_p2,"Center");
    	this.add(_jp3,"South");
    	
    	pack();
    	setVisible(true);
    	setResizable(false);
    	this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    	int W = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth();
    	int H = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();
    	this.setLocation((W-this.getWidth())/2,(H-this.getHeight())/2);
    }
    
    public static void main (String[] args) {
    	new Login();
}

	public void actionPerformed(ActionEvent e)
	{
		Conn conn = new Conn();
		if(e.getSource()==_jbsub)
		{
			String username = _jfid.getText().trim();
			String userpassword = new String(_jfpass.getPassword()).trim();
			if(conn.Login(username,userpassword))
			{
				if(conn.ifadmin(username,userpassword,userpopedom))
				{
					dispose();
					JOptionPane.showMessageDialog(this,"欢迎管理员登录!");
					new Manage(username,userpassword,userpopedom);
				}else
				{
					new Trainticket(username,userpassword);
				}
				dispose();
			}else{
				JOptionPane.showMessageDialog(this,"登录失败，请检查密码是否正确！");
			}
		}
		if(e.getSource()==_jbcan)
		{
			System.exit(0);
		}
		if(e.getSource()==_jfid)
		{
			_jfpass.requestFocus(true);
		}
		if(e.getSource()==_jfpass)
		{
			_jbsub.requestFocus(true);
		}
	}
	
}