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:

  • 客户端程序,从控制台输入字符串,发送到服务器端,并将服务器返回的信息显示出来
  • 服务器端程序,从客户机接收数据并打印,同时将从标准输入获取的信息发送给客户机
  • 满足一个服务器可以服务多个客户

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。

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