java实现tcp 发送和接收

在Java中，我们可以使用java.net包下的Socket和ServerSocket类来实现TCP通信的发送和接收。以下是一个简单的客户端-服务器端模型：

### 客户端示例 (发送数据):

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

public class TcpClient {
    public static void main(String[] args) {
        try {
            // 创建Socket实例
            Socket socket = new Socket("localhost", 8080); // 地址和端口
            System.out.println("Connected to server");

            // 获取OutputStream来发送数据
            OutputStream outputStream = socket.getOutputStream();
            String message = "Hello from client";
            byte[] bytes = message.getBytes(); // 转换为字节数组

            // 发送数据
            outputStream.write(bytes);
            outputStream.flush();

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

### 服务器端示例 (接收数据):

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class TcpServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(8080); // 监听的端口
        System.out.println("Server started, listening on port 8080");

        while (true) {
            Socket clientSocket = serverSocket.accept(); // 等待并接受连接
            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: " + inputLine);
                    // 可在此处处理接收到的数据
                    out.println("Message received and acknowledged");
                }

            } finally {
                clientSocket.close();
            }
        }
    }
}