用Java写一个TCP通信的

示例程序

以下是一个简单的Java TCP通信示例程序，包括服务器端和客户端：

服务器端代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class TCPServer {
    public static void main(String[] args) {
        try {
            // 创建ServerSocket对象，绑定端口号
            ServerSocket serverSocket = new ServerSocket(8888);
            System.out.println("Server started...");

            while (true) {
                // 监听客户端的连接请求，等待连接
                Socket clientSocket = serverSocket.accept();

                // 获取输入输出流
                BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
                PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);

                // 读取客户端发送的数据
                String inputLine;
                while ((inputLine = in.readLine()) != null) {
                    System.out.println("Received message from client: " + inputLine);

                    // 发送响应消息给客户端
                    out.println("Server response: " + inputLine);

                    if (inputLine.equals("bye")) {
                        break;
                    }
                }

                // 关闭连接
                in.close();
                out.close();
                clientSocket.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

客户端代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class TCPClient {
    public static void main(String[] args) {
        try {
            // 创建Socket对象，指定服务器地址和端口号
            Socket socket = new Socket("localhost", 8888);

            // 获取输入输出流
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

            // 向服务器发送数据
            out.println("Hello server!");

            // 读取服务器响应消息
            String response;
            while ((response = in.readLine()) != null) {
                System.out.println("Received message from server: " + response);
            }

            // 关闭连接
            in.close();
            out.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

运行服务器端程序后，再运行客户端程序，客户端会向服务器发送一条消息，服务器将会回复一条响应消息，并打印出来。如果客户端发送了"bye"消息，服务器将会关闭连接。