服务器端 server.cpp

#include <iostream>
#include <cstring>
#include <unistd.h>
#include <arpa/inet.h>

int main() {
    int server_fd, client_fd;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_len = sizeof(client_addr);
    char buffer[1024] = {0};

    // 1. 创建 socket
    server_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_fd < 0) {
        perror("socket creation failed");
        return -1;
    }

    // 2. 绑定地址和端口
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;  // 监听所有网卡
    server_addr.sin_port = htons(8888);
    
    if (bind(server_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        perror("bind failed");
        return -1;
    }

    // 3. 监听
    if (listen(server_fd, 3) < 0) {
        perror("listen failed");
        return -1;
    }
    std::cout << "Server listening on port 8888..." << std::endl;

    // 4. 接受客户端连接
    client_fd = accept(server_fd, (struct sockaddr*)&client_addr, &client_len);
    if (client_fd < 0) {
        perror("accept failed");
        return -1;
    }
    std::cout << "Client connected from " << inet_ntoa(client_addr.sin_addr) << std::endl;

    // 5. 接收数据
    int bytes_read = read(client_fd, buffer, sizeof(buffer) - 1);
    if (bytes_read > 0) {
        buffer[bytes_read] = '\0';
        std::cout << "Received: " << buffer << std::endl;
    }

    // 6. 发送回复
    const char* reply = "Server received your message";
    send(client_fd, reply, strlen(reply), 0);

    // 7. 关闭连接
    close(client_fd);
    close(server_fd);
    return 0;
}

客户端 client.cpp

#include <iostream>
#include <cstring>
#include <unistd.h>
#include <arpa/inet.h>

int main() {
    int sock;
    struct sockaddr_in server_addr;
    char buffer[1024] = {0};

    // 1. 创建 socket
    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) {
        perror("socket creation failed");
        return -1;
    }

    // 2. 配置服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8888);
    if (inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) <= 0) {
        perror("invalid address");
        return -1;
    }

    // 3. 连接服务器
    if (connect(sock, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        perror("connection failed");
        return -1;
    }

    // 4. 发送消息
    const char* message = "Hello from C++ client";
    send(sock, message, strlen(message), 0);
    std::cout << "Message sent: " << message << std::endl;

    // 5. 接收回复
    int bytes_read = read(sock, buffer, sizeof(buffer) - 1);
    if (bytes_read > 0) {
        buffer[bytes_read] = '\0';
        std::cout << "Server reply: " << buffer << std::endl;
    }

    // 6. 关闭 socket
    close(sock);
    return 0;
}

编译运行：

# 编译
g++ server.cpp -o server
g++ client.cpp -o client

# 先启动服务器
./server

# 另开终端运行客户端
./client

改进方向