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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