login.java

可以实现一对一

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


public class Login extends JFrame implements ActionListener
{
	JButton b1,b2,dlgb1;
	JTextField text;
	JPanel pane;
	JLabel l1,dlgl1;
	JComboBox cb1;
	Dialog dlg;
	Container con=this.getContentPane();
	Mm mm;
	public Login()
	{
		super("Title");
		setSize(200,120);
		String[] s=new String[2];
	    s[0]="男";
 	    s[1]="女";
 	    cb1=new JComboBox(s);
 	    cb1.setBackground(new Color(254,227,224));
		l1=new JLabel("注册名:");
		dlgl1=new JLabel("     登陆成功！     ");
		dlgl1.setFont(new Font("宋体", Font.BOLD, 15));
		b1=new JButton("确定");
		b1.setBackground(new Color(254,227,224));
		b2=new JButton("退出");
		b2.setBackground(new Color(254,227,224));
		dlgb1=new JButton("确定");
		dlgb1.setBackground(new Color(254,227,224));
		text=new JTextField(10);
		dlg=new Dialog(this,"登陆成功",true);
		pane=new JPanel();
		
		b1.addActionListener(this);
		b2.addActionListener(this);
		dlgb1.addActionListener(this);
		
		dlg.setSize(200,100);
		dlg.add(dlgl1);
		dlg.add(dlgb1);
		dlg.setLayout(new FlowLayout());
		dlg.setBackground(new Color(237,240,241));
		pane.add(l1);
		pane.add(text);
		pane.add(cb1);
		pane.add(b1);
		pane.add(b2);	
		pane.setLayout(new FlowLayout());
		pane.setBackground(new Color(237,240,241));     
		con.add(pane);
		setLocation(400,300);
		mm=new Mm();
		
		setResizable(false);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		show();
	}
	
	public static void main(String[] args)
	{
		new Login();
	}
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==b1)
		{
			
			if(mm.connect(text.getText(),cb1.getSelectedIndex()))
			{
				this.dispose();
				new Frame1().show();
				dlg.show();
			}
			else
			{
				this.dispose();
				mm.dlg();
			}
		}
		if(e.getSource()==b2)
		{
			mm.exit();
		}
		if(e.getSource()==dlgb1)
		{
			mm.updata("OK");
			dlg.dispose();
		}
	}
}
class Mm
{
	String text,sex,ip,str;
	void exit()
	{
		System.exit(0);
	}
	////////////////////////////////////////////
	boolean connect(String text,int sex)
	{
	//	System.out.print(text+"   "+sex);
	try
	{
		if(sex==0)
		{
			str=text+"(男)";
		}
		else
		{
			str=text+"(女)";
		}
		DatagramSocket ds1=new DatagramSocket();
		DatagramPacket dp1=new DatagramPacket(str.getBytes(),str.getBytes().length,InetAddress.getByName("127.0.0.1"),8500);
        ds1.send(dp1);
        ds1.close();
        
		DatagramSocket ds2=new DatagramSocket(8501);
        byte[] buf=new byte[5];
        DatagramPacket dp2=new DatagramPacket(buf,5);
        ds2.receive(dp2);
        str=new String(dp2.getData(),0,dp2.getLength());
        System.out.println(str);
        ds2.close();
	}
	catch(Exception e)
	{
		System.out.println(e);
	}
	finally
	{
		if(str.equals("true"))
		return true;
		else
		return false;
	}
	}
	///////////////////////////////////////////
	
	void strsend(String str)
	{
		try
		{
		DatagramSocket ds3=new DatagramSocket();
		DatagramPacket dp3=new DatagramPacket(str.getBytes(),str.getBytes().length,InetAddress.getByName("127.0.0.1"),8000);
        ds3.send(dp3);
        ds3.close();
        }
        catch(Exception e2)
        {
        	e2.printStackTrace();
        }
	}
	
	///////////////////////////////////////////
	void dlg()
	{
        int rr=JOptionPane.showConfirmDialog(null,"这个用户已存在","确定窗口",JOptionPane.CLOSED_OPTION);
	}
	///////////////////////////////////////////
	void updata(String updata)
	{
		try
		{
		DatagramSocket ds4=new DatagramSocket();
		DatagramPacket dp4=new DatagramPacket(updata.getBytes(),updata.getBytes().length,InetAddress.getByName("127.0.0.1"),9500);
        ds4.send(dp4);
        ds4.close();
        System.out.println(updata+" Sendover");
        }
        catch(Exception e2)
        {
        	e2.printStackTrace();
        }	
	}
}