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這篇文章主要介紹Java中如何實(shí)現(xiàn)Socket多客戶端Client-Server聊天程序,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
任務(wù)要求
編寫一個(gè)簡(jiǎn)單的Socket多客戶端聊天程序:
客戶端程序,從控制臺(tái)輸入字符串,發(fā)送到服務(wù)器端,并將服務(wù)器返回的信息顯示出來
服務(wù)器端程序,從客戶機(jī)接收數(shù)據(jù)并打印,同時(shí)將從標(biāo)準(zhǔn)輸入獲取的信息發(fā)送給客戶機(jī)
滿足一個(gè)服務(wù)器可以服務(wù)多個(gè)客戶
低配版本鏈接
實(shí)現(xiàn)代碼
工具類
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); } }
服務(wù)器端線程
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("歡迎來到聊天室!"); login(); System.out.println(currentUserNickName + "用戶登錄成功"); write(currentUserNickName + ", 您已登錄。\n輸入【list users】可以查看當(dāng)前登錄用戶列表\n輸入【to all 消息內(nèi)容】可以群發(fā)消息\n輸入【to 某個(gè)用戶 消息內(nèi)容】可以給指定用戶發(fā)送消息\n輸入【exit】可以退出聊天"); String input = dis.readUTF(); while (!ChatServer.EXIT.equals(input)) { System.out.println(currentUserNickName + "輸入了" + input); if (input.startsWith("to ")) { sendMessage(input); } else if ("list users".equals(input)) { showOnlineUsers(); } else { write("您輸入的命令不合法,請(qǐng)重新輸入!"); } 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("請(qǐng)輸入你的昵稱:"); while (true) { String nickName = dis.readUTF(); System.out.println("用戶輸入了昵稱:" + nickName); synchronized (ChatServerRunnable.class) { if (!ChatServer.nickNameSocketMap.containsKey(nickName)) { currentUserNickName = nickName; ChatServer.nickNameSocketMap.put(nickName, socket); break; } else { write("您輸入的昵稱已存在,請(qǐng)重新輸入:"); } } } } 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("您要單獨(dú)聊天的用戶【" + receiver + "】不存在或者已經(jīng)下線"); } } private String formatMessage(String receiver, String originalMessage) { StringBuilder messageBuilder = new StringBuilder(); messageBuilder.append(currentUserNickName).append(" 對(duì) ").append(receiver).append(" 說:\n") .append(originalMessage).append("\n發(fā)送時(shí)間:") .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("當(dāng)前在線的用戶有:\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); } }
客戶端線程
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("與服務(wù)器的連接已中斷!"); break; } if (!timeToStop) { e.printStackTrace(); } } } } public void stop() { timeToStop = true; } }
服務(wù)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("聊天室服務(wù)器端已啟動(dòng),正在監(jiān)聽" + PORT + "端口"); while (true) { try { Socket socket = ss.accept(); System.out.println("有新用戶連接到服務(wù)器端,信息為:" + socket); new Thread(new ChatServerRunnable(socket)).start(); } catch (Exception e) { e.printStackTrace(); } } } catch (IOException e) { e.printStackTrace(); } } }
客戶端程序
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(); } }
運(yùn)行說明
啟動(dòng)服務(wù)器:
啟動(dòng)第一個(gè)客戶端,輸入客戶昵稱:
服務(wù)器監(jiān)聽到了這個(gè)事件:
獲取所有用戶列表,發(fā)送給所有用戶“hhh”的信息:
服務(wù)器端接收到了這個(gè)事件:
新的客戶端登錄,注冊(cè)用戶昵稱:
服務(wù)器接收到這個(gè)事件:
用戶1向用戶2發(fā)送私聊消息:
用戶2收到用戶1的消息:
客戶2向所有用戶發(fā)送消息:
客戶1收到客戶2的群發(fā)消息:
服務(wù)器監(jiān)聽到了這些事件:
客戶2退出:
客戶1顯示的在線列表只有1人了:
客戶1也退出:
客戶端用戶退出的時(shí)候,該線程終止。
沒客戶端用戶,服務(wù)器也正常跑自己的事。
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