这个Kylin小聊天程序可以在WiFi下启动多个客户端，客户端和指定的客户端聊天，拿出来和大家分享一下，也希望有大神继续改进。使用时记得修改服务器ip！

[a1846427859]

/***********************************************************/
package cn.kylin;

public class ProgramEntry {

	public static void main(String[] args) {
		MainFrame main = new MainFrame();
//		LoginGui login = new LoginGui();
	}

}
/***********************************************************/
package cn.kylin;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.InetAddress;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class MainFrame extends JFrame implements ActionListener {
	JTextArea area;
	JTextField text;
	JTextField with;
	JButton button;
	JPanel panel;

	Socket socket = null;
	DataInputStream in = null;
	DataOutputStream out = null;

	public MainFrame()  {
		setVisible(true);
		setTitle("Kylin");
		setBounds(50, 50, 400, 400);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		init();
	}

	private void init() {
		area = new JTextArea(6,20);
		text = new JTextField(10);
		with = new JTextField(10);
		button = new JButton("发送");
		panel = new JPanel();
		panel.setLayout(new GridLayout(10, 1));

		area.setEditable(false);
		area.setForeground(Color.red);
		area.setFont(new Font("华文行楷", Font.BOLD, 15));
		add(new JScrollPane(area), BorderLayout.CENTER);
		add(text, BorderLayout.NORTH);
		add(panel, BorderLayout.EAST);
		validate();
		try {
			socket = new Socket("192.168.1.106", 2010);
			in = new DataInputStream(socket.getInputStream());
			out = new DataOutputStream(socket.getOutputStream());
		} catch (Exception e) {
			e.printStackTrace();
		} 
		while(true) {
			try {
				String str = in.readUTF();
				if(str.contains(",")) {
					initPanel(str);
				} else {
					area.append(str + "\r\n");
				}
			} catch (Exception e) {
				e.printStackTrace();
				return;
			}
			
		}
	}

	private void initPanel(String str) {
		panel.removeAll();
		String s = str.substring(1);
		String[] arr = s.split(",");
		for(int i = 0; i < arr.length; i++) {
			JButton btn = new JButton(arr[i]);
			btn.addActionListener(this);
			panel.add(btn);
		}
		validate();
	}

	public void actionPerformed(ActionEvent e) {
		JButton btn = (JButton) e.getSource();
		String str = text.getText();
		System.out.println(str);
		try {
			String ip = btn.getText();
			String myIp = InetAddress.getLocalHost().getHostAddress() + ":";
			out.writeUTF(ip + ":v:" + myIp + str);
		} catch (Exception e1) {
			e1.printStackTrace();
		}
	}
}
/********************************************************************//
package cn.kylin;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

public class KylinServer {
	static Map<String, Socket> socketMap = new HashMap<String, Socket>();
	public static void main(String[] args) {
		SocketThread thead;
		ServerSocket serversocket = null;
		try {
			serversocket = new ServerSocket(2010);
		} catch (Exception e) {
			e.printStackTrace();
		}
		System.out.println("服务器已启动");
		while(true) {
			try {
				Socket clientSocket = serversocket.accept();
				if(clientSocket != null) {
					String ip = clientSocket.getInetAddress().getHostAddress();
					socketMap.put(ip, clientSocket);
					new SocketThread(clientSocket).start();
				}
			} catch (Exception e) {
				System.out.println(e);
				return;
			}
		}
	}
}

class SocketThread extends Thread {
	String str = "";
	Socket socket;
	DataInputStream in = null;
	DataOutputStream out = null;
	public SocketThread(Socket t) {
		socket = t;
		try {
			in = new DataInputStream(socket.getInputStream());
			out = new DataOutputStream(socket.getOutputStream());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public void run() {
		System.out.println(socket.getInetAddress().getHostAddress() + ":连接服务器");	
		while(true) {
			DataOutputStream dos = null;
			try {
				String keyStr = "";
				for(String key : KylinServer.socketMap.keySet() ){
					keyStr = keyStr + "," + key;
				}
				out.writeUTF(keyStr);//每次接收信息发socketMap信息
				str = in.readUTF();
				String[] strarr = str.split(":v:");
				Socket s = KylinServer.socketMap.get(strarr[0]);
				if(s != null) {
					dos = new DataOutputStream(s.getOutputStream());
					dos.writeUTF(strarr[1]);
					out.writeUTF(strarr[1]);
				} else {
					out.writeUTF("对方不存在");
				}
			} catch (Exception e) {
				System.out.println("客户端已断开");
				KylinServer.socketMap.remove(socket.getInetAddress().getHostAddress());
				try {
					if(dos != null){
						dos.close();
					}
				} catch (Exception e1) {
					e1.printStackTrace();
					System.exit(0);
				};
				return;
			}
		}
	}
}

记得修改ip啊