login.java

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
import java.util.*;
//import javax.swing.JComponent;

class loglogin extends JFrame implements ActionListener
{
	JTextField nametext;
	JPasswordField paswtext;
	JLabel namelabel;
	JLabel paswlabel;
	JButton login;
	JButton cancel;
	JButton b1;
	JButton b2;
	public loglogin()
	{
		super("用户登录界面");
		JPanel p1 = new JPanel();
		JPanel p2 = new JPanel();
		b2 = new JButton(" 取消");
		b1 = new JButton("登录");
		b1.addActionListener(this);
		b2.addActionListener(this);
		nametext = new JTextField(8);
		paswtext = new JPasswordField(8);
		namelabel = new JLabel("用户名：");
		paswlabel = new JLabel("密码：");
		p1.setLayout(new GridLayout(2,2));
		
        	Container ct = getContentPane();
		ct.setLayout(new BorderLayout());
		ct.add(p1,BorderLayout.NORTH);
		ct.add(p2,BorderLayout.SOUTH);
		
		p1.add(namelabel);
		p1.add(nametext);
		p1.add(paswlabel);
		p1.add(paswtext);
		p2.setLayout(new FlowLayout());
		p2.add(b1);
		p2.add(b2);

		setVisible(true);
		setBounds(200,200,200,150);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==b1)
		{
			checklogin();                     
		}
		if(e.getSource()==b2)
		{
			dispose();
			new login();
		}
	}


	public void checklogin()
	{
		boolean flag = true;
		contest c =new contest();
		String command="select * from userinfo ";
		Statement sm=null;
		ResultSet rs=null;
		try
		{
			sm=c.getConnection().createStatement();
			rs=sm.executeQuery(command);
			while(rs.next())
			{
				if(rs.getString(1).trim().equals(nametext.getText()))
				{
					flag = false;
					if(paswtext.getText().equals(rs.getString(2).trim()))
						{
							JOptionPane.showMessageDialog(null,"用户登录成功!","",2);
							break;
						}
					else
						{
							JOptionPane.showMessageDialog(null,"密码不正确，请重新登录!","",0);
							paswtext.setText("");
							break;
						}
				}
			}
			if(flag)
			{
				nametext.setText("");
				paswtext.setText(""); 
				JOptionPane.showMessageDialog(null,"用户名不正确，请重新登录！","",0); 
			}
			sm.close();
			c.getConnection().close();
		}
		catch(Exception ex)
		{
			System.out.println(ex);
		}
	}
}





class contest
{
	public static final String drivername="com.microsoft.jdbc.sqlserver.SQLServerDriver";
	public static final String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=userinfo";
	public static final String user="SA";
	public static final String password="admin";
	private Connection con=null;
	public  Connection getConnection()
	{
		try
		{
			Class.forName(drivername);
			con=DriverManager.getConnection(url,user,password);
		}
		catch (Exception ex)
		{
			System.out.println(ex.getMessage());
		}

		return con;
	}
}





class rejlogin extends JFrame implements ActionListener
{
	JTextField nametext;
	JPasswordField paswtext;
	JLabel namelabel;
	JLabel paswlabel;
	JButton login;
	JButton cancel;
	JButton b1;
	JButton b2;
	public rejlogin()
	{
		super("用户注册界面");
		JPanel p1 = new JPanel();
		JPanel p2 = new JPanel();
		b1 = new JButton("注册");
		b2 = new JButton(" 取消");
		b1.addActionListener(this);
		b2.addActionListener(this);
		nametext = new JTextField(8);
		paswtext = new JPasswordField(8);
		namelabel = new JLabel("用户名：");
		paswlabel = new JLabel("密码：");
		p1.setLayout(new GridLayout(2,2));
		
        Container ct = getContentPane();
		ct.setLayout(new BorderLayout());
		ct.add(p1,BorderLayout.NORTH);
		ct.add(p2,BorderLayout.SOUTH);
		
		p1.add(namelabel);
		p1.add(nametext);
		p1.add(paswlabel);
		p1.add(paswtext);
		p2.setLayout(new FlowLayout());
		p2.add(b1);
		p2.add(b2);
		setVisible(true);
		setBounds(400,300,280,150);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}


public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==b1)
		{
			getrset();
			nametext.setText("");
			paswtext.setText("");                       
		}
		else if(e.getSource()==b2)
		{
			dispose();
			new login();
		}
		
	}

public void getrset()
	{	
		contest c = new contest();
		String command1="INSERT INTO userinfo VALUES("+"'"+nametext.getText()+"'"+","+"'"+paswtext.getText()+"'"+")";
		String command2 ="select * from userinfo ";
		Statement sm=null;
		ResultSet rs=null;
		if(!nametext.getText().equals(""))
		{
			if(!paswtext.getText().equals(""))
			{
				try
				{
					sm=c.getConnection().createStatement();
					rs=sm.executeQuery(command2);
					while(rs.next())
					{
						if(nametext.getText().equals(rs.getString(1).trim()))
						{
							JOptionPane.showMessageDialog(null,"该用户名已经存在，请换名","",0);
							return;
						}
					}
					sm.executeUpdate(command1);
					JOptionPane.showMessageDialog(null,"用户注册成功，是否继续?","",3);
					sm.close();
					c.getConnection().close();
				}
				catch(Exception ex)
				{
					System.out.println(ex);
				}
			}

			else
				JOptionPane.showMessageDialog(null,"密码不能为空，请重新注册！","",0);
		}

		else
			JOptionPane.showMessageDialog(null,"用户名不能为空，请重新注册！","",0);
	}

}


public class login extends JFrame implements ActionListener
{
	JButton rej;
	JButton log;
	JButton del;
	JButton can;
	JLabel l1;
	JLabel l2;
	JLabel l3;
	public login()
	{
		super("用户主界面");
		JPanel p1 = new JPanel();
		JPanel p2 = new JPanel();
		JPanel p3 = new JPanel();
		JPanel p4 = new JPanel();
		JPanel p5 = new JPanel();


		rej = new JButton("注册");
		can = new JButton(" 取消");
		log = new JButton("登录");
		del = new JButton("删除");
		rej.addActionListener(this);
		can.addActionListener(this);
		log.addActionListener(this);
		del.addActionListener(this);

		ImageIcon im = new ImageIcon("D:\\mn.gif");
		l1= new JLabel(im,0);
		l2= new JLabel("厚德载物");
		l3= new JLabel("自强不息");

		p1.setLayout(new FlowLayout());
		p4.setLayout(new FlowLayout());
		p5.setLayout(new FlowLayout());
		p1.add(l1);
		p2.add(rej);
		p2.add(log);
		p3.add(del);
		p3.add(can);
		p4.add(l2);
		p5.add(l3);

		
		setLayout(new BorderLayout());
		add(p1,BorderLayout.NORTH);
		add(p2,BorderLayout.CENTER);
		add(p3,BorderLayout.SOUTH);
		add(p4,BorderLayout.EAST);
		add(p5,BorderLayout.WEST);
		setVisible(true);
		setBounds(350,350,300,320);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==rej)
		{
			dispose();
			new rejlogin();                     
		}
		if(e.getSource()==log)
		{
			dispose();
			new loglogin();
		}
		if(e.getSource()==del)
		{
			dispose();
			//new dellogin();
		}
		if(e.getSource()==can)
		{
			System.exit(0);
		}
	}
	public static void main(String[] args)
	{
		new login();
	}
}