如何在Java Socket中实现多线程通信

在Java Socket中实现多线程通信，可以使用线程池来管理多个客户端连接。这里是一个简单的示例，展示了如何使用Java Socket和多线程实现服务器与多个客户端之间的通信。

1. 首先，创建一个处理客户端请求的Runnable类：

import java.io.*; import java.net.Socket;  public class ClientHandler implements Runnable {     private final Socket clientSocket;      public ClientHandler(Socket clientSocket) {         this.clientSocket = clientSocket;     }      @Override     public void run() {         try (BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));              PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true)) {             String inputLine;             while ((inputLine = in.readLine()) != null) {                 System.out.println("Received from client: " + inputLine);                 out.println("Server received: " + inputLine);             }         } catch (IOException e) {             e.printStackTrace();         } finally {             try {                 clientSocket.close();             } catch (IOException e) {                 e.printStackTrace();             }         }     } } 

2. 然后，创建一个服务器类，用于监听客户端连接并将每个连接分配给一个新的线程：

import java.io.IOException; import java.net.ServerSocket; import java.net.Socket; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors;  public class MultiThreadedServer {     public static void main(String[] args) {         int port = 8080;         ExecutorService executorService = Executors.newFixedThreadPool(10); // 创建一个固定大小的线程池          try (ServerSocket serverSocket = new ServerSocket(port)) {             System.out.println("Server started on port: " + port);              while (true) {                 Socket clientSocket = serverSocket.accept(); // 接受客户端连接                 System.out.println("New client connected: " + clientSocket.getInetAddress());                  ClientHandler clientHandler = new ClientHandler(clientSocket);                 executorService.submit(clientHandler); // 将客户端处理任务提交给线程池             }         } catch (IOException e) {             e.printStackTrace();         } finally {             executorService.shutdown(); // 关闭线程池         }     } } 

3. 最后，创建一个客户端类，用于与服务器进行通信：

import java.io.*; import java.net.Socket;  public class Client {     public static void main(String[] args) {         String hostname = "localhost";         int port = 8080;          try (Socket socket = new Socket(hostname, port);              BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));              PrintWriter out = new PrintWriter(socket.getOutputStream(), true);              BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in))) {             System.out.println("Connected to server");              new Thread(() -> {                 try {                     String serverMsg;                     while ((serverMsg = in.readLine()) != null) {                         System.out.println("Server: " + serverMsg);                     }                 } catch (IOException e) {                     e.printStackTrace();                 }             }).start();              String userInput;             while ((userInput = stdIn.readLine()) != null) {                 out.println(userInput);             }         } catch (IOException e) {             e.printStackTrace();         }     } } 

现在，你可以运行服务器类和多个客户端类实例，它们将能够通过多线程通信。注意，这个示例仅用于演示目的，实际应用中需要考虑更多的错误处理和资源管理。