安卓app和云端交互

APP和云端交互

1.云端服务期器编程
2.APP编程

云端TCP编程

import socket
HOST = ''  # 监听所有可用的网络接口
PORT = 65433  # 使用一个未被占用的端口号
last_response = ""


def send_data(conn, data):
    """发送数据并处理异常"""
    try:
        conn.sendall(data.encode())
        print("消息发送成功")
    except Exception as e:
        print(f"发送失败: {
     
     e}")
        return False
    return True


def read_last_n_lines(file_path, n=10):
    """读取文件的最后n行"""
    try:
        with open(file_path, 'rb') as file:
            lines = []
            buffer = bytearray()
            while True:
                chunk = file.read(1024)
                if not chunk:
                    break
                buffer.extend(chunk)
                while b'\n' in buffer:
                    pos = buffer.find(b'\n')
                    line = buffer[:pos + 1]
                    buffer = buffer[pos + 1:]
                    lines.append(line.decode().strip())
            return lines[-n:]
    except Exception as e:
        print(f"读取文件失败: {
     
     e}")
        return []


def read_last_line(file_path):
    """读取文件的最后一行"""
    try:
        with open(file_path, 'rb') as file:
            file.seek(-2, 2)  # 移动到文件末尾前一个字符
            while file.read(1) != b'\n':  # 寻找最后一个换行符
                file.seek(-2, 1)
            last_line = file.readline().decode()
            return last_line.strip()
    except Exception as e:
        print(f"读取文件失败: {
     
     e}")
        return ""


def handle_client(conn, addr, file_path):
    """处理客户端连接"""
    print(f"已连接到: {
     
     addr}")

    # 读取文件的最后10行
    last_10_lines = read_last_n_lines(file_path, 10)
    for line in last_10_lines:
        response = f"{
     
     line}\n"
        if not send_data(conn, response):
            break

    while True:
        try:
            print("开始接收")
            data = conn.recv(1024)
            print("接收完成")
        except socket.timeout:
            print("接收超时")
            break
        except Exception as e:
            print(f"接收失败: {
     
     e}")
            break

        if not data:
            break

        print(f"接收到: {
     
     data.decode()}")

        # 读取文件的最后一行
        last_line = read_last_line(file_path)

        # 向客户端发送响应消息
        response = f"{
     
     last_line}\n"
        if response != last_response:
            if send_data(conn, response):
                last_response = response
            else:
                break

    print("连接关闭")


def main():
    # 创建一个 socket 对象
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.settimeout(5)

    # 设置 SO_REUSEADDR 选项 以允许重用地址和端口
    server_socket.setsockopt(socket.SOL_SOCKET, socket.