c++实现http服务端

要实现一个基本的HTTP服务器，你需要完成以下步骤：

1. 创建一个TCP套接字并绑定到一个端口

2. 监听传入的连接请求

3. 接受连接请求并处理客户端请求

4. 解析HTTP请求

5. 处理HTTP请求并生成HTTP响应

6. 发送HTTP响应到客户端并关闭连接

以下是一个简单的c++实现HTTP服务器的示例代码：

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

using namespace std;

const int PORT = 8080;
const int MAX_CONNECTIONS = 10;

int main() {
    int server_socket, client_socket;
    struct sockaddr_in server_address, client_address;
    char buffer[1024] = {0};

    // 创建一个套接字
    server_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (server_socket == -1) {
        cerr << "Failed to create socket" << endl;
        exit(EXIT_FAILURE);
    }

    // 绑定套接字到指定端口
    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = INADDR_ANY;
    server_address.sin_port = htons(PORT);
    if (bind(server_socket, (struct sockaddr *) &server_address, sizeof(server_address)) == -1) {
        cerr << "Failed to bind socket to port " << PORT << endl;
        exit(EXIT_FAILURE);
    }

    // 监听传入的连接请求
    if (listen(server_socket, MAX_CONNECTIONS) == -1) {
        cerr << "Failed to listen for connections" << endl;
        exit(EXIT_FAILURE);
    }

    cout << "Server listening on port " << PORT << endl;

    // 接受连接请求并处理客户端请求
    while (true) {
        socklen_t client_address_size = sizeof(client_address);
        client_socket = accept(server_socket, (struct sockaddr *) &client_address, &client_address_size);
        if (client_socket == -1) {
            cerr << "Failed to accept connection" << endl;
            continue;
        }

        cout << "Client connected: " << inet_ntoa(client_address.sin_addr) << endl;

        // 读取客户端发送的HTTP请求
        memset(buffer, 0, sizeof(buffer));
        if (read(client_socket, buffer, sizeof(buffer)) == -1) {
            cerr << "Failed to read HTTP request" << endl;
            close(client_socket);
            continue;
        }

        cout << "Received HTTP request:" << endl << buffer << endl;

        // 处理HTTP请求并生成HTTP响应
        const char *response = "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nContent-Length: 12\r\n\r\nHello World!";
        int response_length = strlen(response);

        // 发送HTTP响应到客户端并关闭连接
        if (write(client_socket, response, response_length) == -1) {
            cerr << "Failed to send HTTP response" << endl;
        }

        cout << "Sent HTTP response:" << endl << response << endl;

        close(client_socket);
        cout << "Client disconnected" << endl;
    }

    return 0;
}

这个示例代码创建了一个TCP套接字并绑定到8080端口。它监听传入的连接请求，接受连接请求并处理客户端请求。当客户端发送HTTP请求时，它读取HTTP请求并生成HTTP响应，然后将响应发送回客户端并关闭连接。

请注意，这只是一个简单的示例代码，并不具有完整的HTTP服务器功能。如果你想要实现一个完整的HTTP服务器，你需要考虑更多的因素，比如线程管理、错误处理、安全性等。