tcp创建简易的web服务器

小结：
1.套接字接受和发送数据都是以字节的形式进行，发送要编码二进制，接受要解码成字符串
2.正则表达式[^/]为反向字符集，表示不为/的字符
3.tcpsocket使用步骤：socket.socket,bind,listen(128),accept(),recv()
4.read(字节数)

代码：
import socket
import re


def service_client(new_socket):
    """对请求做出响应"""
    # 解析请求中的文件名
    request = new_socket.recv(1024).decode("utf-8")
    print(">>>"*30 + request)
    request_lines = request.splitlines()
    ret = re.match(r"[^/]+([^ ]*)", request_lines[0])
    file_name = ""
    if ret:
        file_name = ret.group(1)
        print(file_name)
        if file_name == "/":
            file_name = "/index.html"
    try:
        f = open("./html" + file_name, "rb")
    except FileNotFoundError:
        response_header = "HTTP/1.1 404 FILE NOT FOUND\r\n"
        response_header += "\r\n"
        response_body = "服务器开小差了。。。"
        new_socket.send(response_header.encode("utf-8"))
        new_socket.send(response_body.encode("gbk"))
    else:
        content = f.read()
        f.close()
        response_header = "HTTP/1.1 200 OK\r\n"
        response_header += "\r\n"
        response_body = content
        new_socket.send(response_header.encode("utf-8"))
        new_socket.send(response_body)
    new_socket.close()


def main():
    """tcp建立web服务器"""
    tcp_server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    tcp_server_socket.bind(("127.0.0.1", 7788))
    tcp_server_socket.listen(128)
    print("服务器已开启.......")
    while True:
        new_socket, client_address = tcp_server_socket.accept()
        service_client(new_socket)


if __name__ == '__main__':
    main()