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基于Java的Socket多客户端Client-Server聊天程序的实现

作者：进阶的JFarmer

这篇文章主要介绍了基于Java的Socket多客户端Client-Server聊天程序的实现，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧

任务要求

编写一个简单的Socket多客户端聊天程序：

低配版本链接

实现代码

工具类

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;

public class SocketUtils {
	
	public static void writeToSocket(Socket socket, String message) throws IOException {
		writeToOutputStream(socket.getOutputStream(), message);
	}
	
	public static void writeToDataOutputStream(DataOutputStream dos, String message) throws IOException {
		dos.writeUTF(message);
		dos.flush();
	}
	
	public static void writeToOutputStream(OutputStream os, String message) throws IOException {
		writeToDataOutputStream(new DataOutputStream(os), message);
	}

}

服务器端线程

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

public class ChatServerRunnable implements Runnable {

	private Socket socket;

	private DataOutputStream dos;

	private DataInputStream dis;

	private String currentUserNickName;

	public ChatServerRunnable(Socket socket) throws IOException {
		this.socket = socket;
		this.dos = new DataOutputStream(socket.getOutputStream());
		this.dis = new DataInputStream(socket.getInputStream());
	}

	@Override
	public void run() {
		try {
			write("欢迎来到聊天室！");
			login();
			System.out.println(currentUserNickName + "用户登录成功");
			write(currentUserNickName + "， 您已登录。\n输入【list users】可以查看当前登录用户列表\n输入【to all 消息内容】可以群发消息\n输入【to 某个用户 消息内容】可以给指定用户发送消息\n输入【exit】可以退出聊天");
			String input = dis.readUTF();
			while (!ChatServer.EXIT.equals(input)) {
				System.out.println(currentUserNickName + "输入了" + input);
				if (input.startsWith("to ")) {
					sendMessage(input);
				} else if ("list users".equals(input)) {
					showOnlineUsers();
				} else {
					write("您输入的命令不合法，请重新输入！");
				}
				input = dis.readUTF();
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			ChatServer.nickNameSocketMap.remove(currentUserNickName);
			try {
				dis.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			try {
				dos.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			try {
				socket.close();
			} catch (IOException e) {
				e.printStackTrace();
			}

		}
	}

	private void login() throws IOException {
		write("请输入你的昵称：");
		while (true) {
			String nickName = dis.readUTF();
			System.out.println("用户输入了昵称：" + nickName);
			synchronized (ChatServerRunnable.class) {
				if (!ChatServer.nickNameSocketMap.containsKey(nickName)) {
					currentUserNickName = nickName;
					ChatServer.nickNameSocketMap.put(nickName, socket);
					break;
				} else {
					write("您输入的昵称已存在，请重新输入：");
				}
			}
		}
	}

	private void sendMessage(String input) throws IOException {
		int receiverEndIndex = input.indexOf(" ", 3);
		String receiver = input.substring(3, receiverEndIndex);
		String message = input.substring(receiverEndIndex + 1);
		if ("all".equals(receiver)) {
			broadcast(message);
		} else {
			sendIndividualMessage(receiver, message);
		}
	}

	private void sendIndividualMessage(String receiver, String orignalMessage) throws IOException {
		Socket receiverSocket = ChatServer.nickNameSocketMap.get(receiver);
		if (receiverSocket != null) {
			SocketUtils.writeToSocket(receiverSocket, formatMessage("你", orignalMessage));
		} else {
			write("您要单独聊天的用户【" + receiver + "】不存在或者已经下线");
		}
	}

	private String formatMessage(String receiver, String originalMessage) {
		StringBuilder messageBuilder = new StringBuilder();
		messageBuilder.append(currentUserNickName).append(" 对 ").append(receiver).append(" 说：\n")
				.append(originalMessage).append("\n发送时间：")
				.append(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
		return messageBuilder.toString();
	}

	private void broadcast(String orignalMessage) throws IOException {
		for (Map.Entry<String, Socket> entry : ChatServer.nickNameSocketMap.entrySet()) {
			if (!currentUserNickName.equals(entry.getKey())) {
				SocketUtils.writeToSocket(entry.getValue(), formatMessage("所有人", orignalMessage));
			}
		}
	}
	
	private void showOnlineUsers() throws IOException {
		StringBuilder users = new StringBuilder();
		users.append("当前在线的用户有：\n");
		for (String nickName : ChatServer.nickNameSocketMap.keySet()) {
			users.append("【").append(nickName).append("】\n");
		}
		write(users.toString());
	}

	private void write(String message) throws IOException {
		SocketUtils.writeToDataOutputStream(dos, message);
	}

}

客户端线程

import java.io.DataInputStream;
import java.io.IOException;

public class ClientMessageReceiver implements Runnable {
	
	private DataInputStream dis;
	
	private boolean timeToStop = false;
	
	public ClientMessageReceiver(DataInputStream dis) {
		this.dis = dis;
	}

	@Override
	public void run() {
		while (!timeToStop) {
			try {
				System.out.println(dis.readUTF());
			} catch (IOException e) {
				if ("Connection reset".equals(e.getMessage())) {
					System.out.println("与服务器的连接已中断！");
					break;
				}
				if (!timeToStop) {
					e.printStackTrace();					
				}
			}
		}
	}
	
	public void stop() {
		timeToStop = true;
	}

}

服务器端程序

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

public class ChatServer {
	
	public static final String EXIT = "exit";
	
	public static final int PORT = 8888;
	
	static Map<String, Socket> nickNameSocketMap = new HashMap<>();

	public static void main(String[] args) {
		try (ServerSocket ss = new ServerSocket(PORT)) {
			System.out.println("聊天室服务器端已启动，正在监听" + PORT + "端口");
			while (true) {
				try {
					Socket socket = ss.accept();
					System.out.println("有新用户连接到服务器端，信息为：" + socket);
					new Thread(new ChatServerRunnable(socket)).start();
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

}

客户端程序

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.Scanner;

public class ChatClient {
	
	private static Scanner scanner = new Scanner(System.in);

	public static void main(String[] args) {
		try (Socket socket = new Socket("127.0.0.1", 8888);
				DataInputStream dis = new DataInputStream(socket.getInputStream());
				DataOutputStream dos = new DataOutputStream(socket.getOutputStream())) {
			
			ClientMessageReceiver messageReceiver = new ClientMessageReceiver(dis);
			new Thread(messageReceiver).start();
			String input = null;
			do {
				input = scanner.nextLine();
				write(dos, input);
			} while (!ChatServer.EXIT.equals(input));
			messageReceiver.stop();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}
	
	private static void write(DataOutputStream dos, String message) throws IOException {
		dos.writeUTF(message);
		dos.flush();
	}

}

运行说明

启动服务器：

启动第一个客户端，输入客户昵称：

服务器监听到了这个事件：


获取所有用户列表，发送给所有用户“hhh”的信息：


服务器端接收到了这个事件：


新的客户端登录，注册用户昵称：

服务器接收到这个事件：


用户1向用户2发送私聊消息：


用户2收到用户1的消息：


客户2向所有用户发送消息：


客户1收到客户2的群发消息：


服务器监听到了这些事件：


客户2退出：


客户1显示的在线列表只有1人了：


客户1也退出：

客户端用户退出的时候，该线程终止。

没客户端用户，服务器也正常跑自己的事。

到此这篇关于基于Java的Socket多客户端Client-Server聊天程序的实现的文章就介绍到这了,更多相关Java Socket多客户端Client-Server聊天内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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