java TCP在线聊天室V2 支持群聊私聊 显示用户名称

服务端

package study_05;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.CopyOnWriteArrayList;
/*
 * 目标: 支持群聊
 */

public class MultiThreadCheatServerV3 {
	private static CopyOnWriteArrayList all = new CopyOnWriteArrayList<>();//CopyOnWriteArrayList支持边遍历边写入
	public static void main(String[] args) throws IOException {
		System.out.println("------Server--------");
		ServerSocket server = new ServerSocket(9999);//开启服务器
		
		while (true) {//循环接收客户端
			Socket client = server.accept();//阻塞接收
			System.out.println("有客户端连接上");
			Channel c = new Channel(client);
			all.add(c);//管理所有的成员
			new Thread(c).start();
		}
	}
	static class Channel implements Runnable{
		private DataInputStream dis;
		private DataOutputStream dos;
		private Socket client;
		private boolean isRunning = true;
		private String name;
		
		public Channel(Socket client) {
			this.client = client;
			try {
				dis = new DataInputStream(client.getInputStream());
				dos = new DataOutputStream(client.getOutputStream());
				this.name = recieve();
			} catch (IOException e) {
				release();//报错则释放资源
			}
		}

		//接受消息
		private String recieve() {
			String msg = "";
			try {
				msg = dis.readUTF();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				release();
			}
			return msg;
		}; 
		
		//发送消息
		private void send(String msg) {
			try {
				dos.writeUTF(msg);
				dos.flush();
			} catch (IOException e) {
				release();
			}
		}
		
		//群聊发送消息
		private void sendOther(String msg) {
			boolean isPrivate = msg.startsWith("@");
			if (isPrivate) {
				int index = msg.indexOf(":");
				String targetName = msg.substring(1, index);
				msg = msg.substring(index+1);
				for (Channel other : all) {
					if (other.name.equals(targetName)) {
						other.send(this.name + "悄悄对你说:"  + msg);
					}
				}
			}else {
				for (Channel other : all) {
					if (other == this) {
						continue;
					}
					other.send(this.name + ":发送所有人--->" + msg);
				}
			}
			
			
		};
		
		//释放资源
		private void release() {
			System.out.println("服务器出错");
			isRunning = false;
			all.remove(this);//
			IOutils.close(dis,dos,client);
		}
		
		@Override
		public void run() {
			while (isRunning) {
				String msg = recieve();
				if (!msg.equals("")) {
					sendOther(msg);
				}
			}
		}
	}
}

客户端

package study_05;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

public class MultiThreadCheatClientV3 {
	public static void main(String[] args) throws UnknownHostException, IOException {
		System.out.println("------Client--------");
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));		
		System.out.println("请输入名字:");//输入用户名
		String name = reader.readLine();
		Socket client = new Socket("localhost",9999);
		new Thread(new Send(client,name)).start();//开启发送消息线程
		new Thread(new Recieve(client)).start();//开启接收消息线程
	}
}

发送消息类

package study_05;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
/*
 * 
 * 发送消息类
 * 
 */
public class Send implements Runnable{
	private DataOutputStream dos;
	private Socket client;
	private boolean isRunning = true;
	private BufferedReader reader;
	private String name;
	public Send(Socket client,String name) {
		this.name = name;
		this.client = client;
		reader = new BufferedReader(new InputStreamReader(System.in));
		
		try {
			dos = new DataOutputStream(client.getOutputStream());
			send(name);
		} catch (IOException e) {
			release();
		}
	}
	
	//从控制台接收消息
	private String getMsgFromConsole() {
		try {
			return reader.readLine();
		} catch (IOException e) {
			release();
		}
		return "";
	}
	
	//发送消息
	private void send(String msg) {
		try {
			dos.writeUTF(msg);
			dos.flush();
		} catch (IOException e) {
			release();
		}
	}

	@Override
	public void run() {
		while (isRunning) {
			String msg = getMsgFromConsole();
			if (!msg.equals("")) {//消息不为空
				send(msg);//发送消息
			}
		}
	}
	//释放资源
	private void release() {
		System.out.println("客户端发送出错");
		isRunning = false;
		IOutils.close(dos,client);
	}
}