静态网页服务器,发送html文件内容

1.创建index.html

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<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>Page Title</title>
</head>
<body>

<h1>This is a Heading</h1>
<p>This is a paragraph.</p>

</body>
</html>

2.创建server.c

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#include <sys/socket.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/sendfile.h>
#define PORT 8080

int main() {
    int s = socket(AF_INET, SOCK_STREAM, 0);
    if (s < 0) {
        perror("socket");
        return 1;
    }

    int opt = 1;
    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));

    struct sockaddr_in addr;
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(PORT);
    addr.sin_addr.s_addr = INADDR_ANY;

    if (bind(s, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
        perror("bind");
        return 1;
    }

    if (listen(s, SOMAXCONN) < 0) {
        perror("listen");
        return 1;
    }

    printf("Server running on http://0.0.0.0:%d\n", PORT);

    while (1) {
        int client_fd = accept(s, NULL, NULL);
        if (client_fd < 0) {
            perror("accept");
            continue;
        }

        char buffer[2048] = {0};
        recv(client_fd, buffer, sizeof(buffer), 0);

        // 打开 index.html
        int fd = open("index.html", O_RDONLY);
        if (fd < 0) {
            const char *err = "HTTP/1.1 404 Not Found\r\n"
                              "Content-Type: text/plain\r\n"
                              "Content-Length: 13\r\n"
                              "Connection: close\r\n\r\n"
                              "404 Not Found";
            write(client_fd, err, strlen(err));
            close(client_fd);
            continue;
        }

        // 获取文件大小
        struct stat st;
        fstat(fd, &st);
        size_t filesize = st.st_size;

        // 发送 HTTP 头
        char header[256];
        int len = snprintf(header, sizeof(header),
            "HTTP/1.1 200 OK\r\n"
            "Content-Type: text/html\r\n"
            "Content-Length: %zu\r\n"
            "Connection: close\r\n\r\n",
            filesize
        );
        write(client_fd, header, len);

        // 发送文件内容
        off_t offset = 0;
        while (offset < filesize) {
            ssize_t sent = sendfile(client_fd, fd, &offset, filesize - offset);
            if (sent <= 0) break;
        }

        close(fd);
        close(client_fd);
    }

    close(s);
    return 0;
}

3.编译运行

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gcc server.c
./a.out

4.浏览器或curl访问http://127.0.0.1:8080

5.访问成功