编写TCP程序,使得服务端可以自由控制客户端的下载速度。在服务端,控制每次从文件中读取数
时间: 2024-04-30 22:20:07 浏览: 16
据的大小,然后通过调整发送数据的时间间隔来控制客户端的下载速度。以下是一个简单的Python实现:
服务端代码:
```python
import socket
import time
# 服务器地址和端口
SERVER_ADDRESS = ('localhost', 8888)
# 文件路径
FILE_PATH = 'test.txt'
# 每次读取的数据大小
BUFFER_SIZE = 1024
# 限制下载速度的时间间隔
INTERVAL = 0.01
# 创建TCP socket并监听
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind(SERVER_ADDRESS)
server_socket.listen(1)
print('Server is listening on {}:{}'.format(*SERVER_ADDRESS))
while True:
# 等待客户端连接
client_socket, client_address = server_socket.accept()
print('Client {}:{} connected'.format(*client_address))
# 打开文件并读取数据
with open(FILE_PATH, 'rb') as f:
data = f.read(BUFFER_SIZE)
while data:
# 发送数据
client_socket.send(data)
# 控制下载速度
time.sleep(INTERVAL)
# 继续读取数据
data = f.read(BUFFER_SIZE)
# 关闭客户端连接
client_socket.close()
print('Client {}:{} disconnected'.format(*client_address))
```
客户端代码:
```python
import socket
# 服务器地址和端口
SERVER_ADDRESS = ('localhost', 8888)
# 下载文件保存路径
FILE_PATH = 'test_download.txt'
# 每次接收的数据大小
BUFFER_SIZE = 1024
# 创建TCP socket并连接服务器
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(SERVER_ADDRESS)
print('Connected to server {}:{}'.format(*SERVER_ADDRESS))
# 接收数据并保存到文件中
with open(FILE_PATH, 'wb') as f:
data = client_socket.recv(BUFFER_SIZE)
while data:
f.write(data)
data = client_socket.recv(BUFFER_SIZE)
# 关闭客户端连接
client_socket.close()
print('Disconnected from server {}:{}'.format(*SERVER_ADDRESS))
```
在服务端代码中,使用`time.sleep()`函数来控制每次发送数据的时间间隔,从而限制下载速度。在客户端代码中,使用循环接收数据并保存到文件中。