基于Java的Socket多客户端Client-Server聊天程序的实现

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());}@Overridepublic 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;}@Overridepublic 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。

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