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。
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