tcp双人聊天代码实现java加线程

以下是一个简单的TCP双人聊天Java程序实现，并使用了线程：

Server端代码：

import java.net.*;
import java.io.*;

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(5000);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 5000.");
            System.exit(1);
        }

        System.out.println("Server started. Listening on port 5000...");
        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }

        System.out.println("Client connected: " + clientSocket.getInetAddress().getHostName());

        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

        // Create a new thread for receiving messages from client
        Thread receiverThread = new Thread(new Runnable() {
            @Override
            public void run() {
                String inputLine;
                try {
                    while ((inputLine = in.readLine()) != null) {
                        System.out.println("Client: " + inputLine);
                    }
                } catch (IOException e) {
                    System.err.println("Receiver thread error.");
                    System.exit(1);
                }
            }
        });
        receiverThread.start();

        // Main thread for sending messages to client
        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
        String userInput;
        try {
            while ((userInput = stdIn.readLine()) != null) {
                out.println(userInput);
            }
        } catch (IOException e) {
            System.err.println("Sender thread error.");
            System.exit(1);
        }

        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
    }
}

Client端代码：

import java.net.*;
import java.io.*;

public class Client {
    public static void main(String[] args) throws IOException {
        Socket serverSocket = null;
        try {
            serverSocket = new Socket("localhost", 5000);
        } catch (UnknownHostException e) {
            System.err.println("Unknown host: localhost.");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Could not connect to localhost.");
            System.exit(1);
        }

        System.out.println("Connected to server: " + serverSocket.getInetAddress().getHostName());

        PrintWriter out = new PrintWriter(serverSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(serverSocket.getInputStream()));

        // Create a new thread for receiving messages from server
        Thread receiverThread = new Thread(new Runnable() {
            @Override
            public void run() {
                String inputLine;
                try {
                    while ((inputLine = in.readLine()) != null) {
                        System.out.println("Server: " + inputLine);
                    }
                } catch (IOException e) {
                    System.err.println("Receiver thread error.");
                    System.exit(1);
                }
            }
        });
        receiverThread.start();

        // Main thread for sending messages to server
        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
        String userInput;
        try {
            while ((userInput = stdIn.readLine()) != null) {
                out.println(userInput);
            }
        } catch (IOException e) {
            System.err.println("Sender thread error.");
            System.exit(1);
        }

        out.close();
        in.close();
        serverSocket.close();
    }
}

在这个实现中，服务器和客户端都使用了一个线程来接收来自对方的消息，并使用主线程来发送消息。这个实现可能存在一些问题，比如没有处理异常或者没有关闭socket等，但可以作为一个简单的例子来理解TCP双人聊天的实现方式。