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   源码介绍

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一个简单的P2P即时聊天系统，实现功能如下： 1) 点对点的单人聊天 2) 多人同时聊天 3) 用户可以自由加入和退出

服务端如下：

客户端聊天记录为：

package netchat;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.text.SimpleDateFormat;
//import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.io.*;
import java.net.*;

import netchat.clientInfo;

public class Server extends JFrame implements ActionListener{
	JButton sendButton,cleanButton,closeButton,startButton;
	TextArea taRecord,taInput;
	TextField textfield;
	List list;
	clientInfo clientinfo;
	ServerSocket serversocket;
	Socket socket;
	//ServerListenThread serverlistenthread;
	ObjectOutputStream out;
	ObjectInputStream in;
	ArrayList<ObjectOutputStream> allOut;
	static InetAddress ip;
	static int port;
	static boolean isStop;
	SimpleDateFormat date=new SimpleDateFormat("yyyy-MM-dd hh:mm EEEE");
	Date time=new Date();
	static Server server;
	public static void main(String[] args)
	{
		server=new Server();
	}
	public Server()
	{
		//初始化allOuts
		this.allOut = new ArrayList<ObjectOutputStream>();
		sendButton=new JButton("发送");
	    sendButton.setMnemonic('S');
		cleanButton=new JButton("清除");
		closeButton=new JButton("关闭");
		startButton=new JButton("启动");
		closeButton.setEnabled(false);
		sendButton.setEnabled(false);
		cleanButton.setEnabled(false);

		taRecord=new TextArea("",14,50);
		taRecord.setBackground(Color.lightGray);
		taInput=new TextArea("",4,50);
		taInput.setBackground(Color.lightGray);
		textfield=new TextField();
		textfield.setBackground(Color.lightGray);
		taRecord.setEditable(false);
		//list.setEnabled(false);
		textfield.setEditable(false);

		//DefaultListModel model=new DefaultListModel();
		list=new List();
		
		Panel p1=new Panel();
		p1.setLayout(new BorderLayout());
		p1.add(new Label("在线列表"),BorderLayout.NORTH);
		p1.add(textfield,BorderLayout.CENTER);

		Panel p2=new Panel();
		p2.setLayout(new BorderLayout());
		p2.add(p1,BorderLayout.NORTH);
		p2.add(list,BorderLayout.CENTER);

		Panel p3=new Panel();
		p3.setLayout(new GridLayout(1,2,90,4));
		p3.add(startButton);
		p3.add(closeButton);

		Panel p4=new Panel();
		p4.setLayout(new BorderLayout());
		p4.add(new Label("聊天记录"),BorderLayout.NORTH);
		p4.add(taRecord,BorderLayout.CENTER);

		Panel p9=new Panel();
		p9.setLayout(new BorderLayout());
		p9.add(p3,BorderLayout.NORTH);
		p9.add(p4,BorderLayout.CENTER);

		Panel p5=new Panel();
		p5.setLayout(new BorderLayout(5,9));
		p5.add(p9,BorderLayout.CENTER);
		p5.add(taInput,BorderLayout.SOUTH);

		Panel p6=new Panel();
		p6.setLayout(new GridLayout(1,2,90,50));
		p6.add(sendButton);
		p6.add(cleanButton);

		Panel p7=new Panel();
		p7.setLayout(new BorderLayout());
		p7.add(p5,BorderLayout.CENTER);
		p7.add(p6,BorderLayout.SOUTH);

		Panel p8=new Panel();
		p8.setLayout(new BorderLayout());
		p8.add(p2,BorderLayout.WEST);
		p8.add(p7,BorderLayout.CENTER);

		setLayout(new BorderLayout());
		add(p8,BorderLayout.CENTER);

	    setSize(450,450);
		setTitle("chatRoom");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		//setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
		setVisible(true);
		sendButton.addActionListener(this);
		cleanButton.addActionListener(this);
		closeButton.addActionListener(this);
		startButton.addActionListener(this);
	}
	
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==startButton)
		{
			startServer();
		}
		else if(e.getSource()==closeButton)
		{
			stopServer();
			System.exit(0);
		}
		else if(e.getSource()==sendButton)
		{
			if(taInput.getText().equalsIgnoreCase("")||taInput.getText()==null)
			{
				JOptionPane.showMessageDialog(this, "尚未输入系统信息!","Information" , JOptionPane.INFORMATION_MESSAGE);
			}
			sendSystemMessage();
		}
		else if(e.getSource()==cleanButton)
		{
			taInput.setText("");
		}
	}
	public void startServer()
	{
		try
		{
			serversocket=new ServerSocket(1234);
			taRecord.append("等待连线....." "\n");
			startButton.setEnabled(false);
			closeButton.setEnabled(true);
			sendButton.setEnabled(true);
			cleanButton.setEnabled(true);
			this.isStop=false;
			clientinfo=new clientInfo();
			ServerListenThread serverlistenthread=new ServerListenThread(serversocket,taRecord,textfield,list,clientinfo);
			serverlistenthread.start();
		}
		catch(Exception e)
		{
			taRecord.append("error0");
		}
	}
	public void stopServer()
	{
		try
		{
			this.isStop=true;
			serversocket.close();
			socket.close();
			list.removeAll();
		}
		catch(Exception e)
		{
			taRecord.append("close");
		}
	}
    public void sendSystemMessage()
	{
		    String message=taInput.getText();
			taRecord.append("系统消息  " taInput.getText() "\n");
			taInput.setText("");
		
				try
				{
					Iterator<ObjectOutputStream> it = this.allOut.iterator();
					while(it.hasNext()){
						ObjectOutputStream tout = it.next();
						tout.writeObject("系统消息");
						tout.flush();
						tout.writeObject(message);
						tout.flush();
					}
					
				}
				catch(Exception e)
				{
					taRecord.append("error92" e.toString());
				}	
	}
    
    public class ServerListenThread extends Thread{
    	ServerSocket serversocket;
    	TextArea taRecord;
    	List list;
    	TextField textfield;
    	clientInfo clientinfo;
    	Node node;
    	//Socket socket;
    	//ObjectOutputStream out;
    	//ObjectInputStream in;
    	ServerReceiveThread serverreceivethread;
    	
    	
    	public ServerListenThread(ServerSocket serversocket,TextArea taRecord,TextField textfield,List list,clientInfo clientinfo)
    	{
    		this.serversocket=serversocket;
    		this.taRecord=taRecord;
    		this.textfield=textfield;
    		this.list=list;
    		this.clientinfo=clientinfo;
    		
    	}
    	public void run()
    	{
    		while(!isStop&&!serversocket.isClosed())
    		{
    			try
    			{
    				node=new Node();
    				socket=serversocket.accept();
    				InetAddress ip=socket.getInetAddress().getByName(socket.getInetAddress().getHostAddress());
    				server.setIp(ip);
    				node.ip=ip;
    				ObjectOutputStream out=new ObjectOutputStream(socket.getOutputStream());
    				allOut.add(out);
    				in=new ObjectInputStream(socket.getInputStream());
    				node.username=(String)in.readObject();
    				node.port = in.readInt();
    				taRecord.append("恭喜你!" node.username "连线成功!" " " "the client " node.username "'s address is " ip ":" node.port "\n");

    				list.add(node.username);
    				clientinfo.add(node);
    				taRecord.append("用户" node.username "已上线\n");
    				String message="在线用户" clientinfo.getCount() "人\n";
    				textfield.setText(message);
    				
    				server.setOut(out);
    				
    				serverreceivethread=new ServerReceiveThread(socket,taRecord,textfield,list,node,clientinfo,in,out,Server.this.allOut,message);
    				serverreceivethread.start();								
    			}
    			catch(Exception e)
    			{
    				taRecord.append("error85" e.toString());
    			}		
    		}
    	}
    }
   
    public void setOut(ObjectOutputStream out)
    {
    	this.out=out;
    }
    public ObjectOutputStream getOut()
    {
    	return out;
    }
    public void setIp(InetAddress ip)
    {
    	this.ip=ip;
    }
    public InetAddress getIp()
    {
    	return ip;
    }
    public void setPort(int port)
    {
    	this.port=port;
    }
    public int getPort()
    {
    	return port;
    }
}