python网络编程（一）

python网络编程（一）。

功能：客户端向服务器发送一张图片。

服务器代码：

 1 #!/user/bin/env python
 2 # -*- coding:utf-8 -*-
 3 import socket
 4 sk = socket.socket()
 5 sk.bind((‘127.0.0.1‘, 8080, ))
 6 sk.listen(5)
 7 while True:
 8     conn, address = sk.accept()
 9     conn.sendall(bytes(‘欢迎登陆FTP!‘, encoding=‘utf-8‘))
10     file_size = conn.recv(1024).decode()
11     conn.sendall(bytes(‘已收到！‘, encoding=‘utf-8‘))
12     total_size = int(file_size)
13     print(file_size)
14     has_recv = 0
15     f = open(‘2.jpg‘, ‘wb‘)
16     while True:
17         if total_size == has_recv:
18             break
19         else:
20             data = conn.recv(1024)
21             f.write(data)
22             has_recv += len(data)
23     f.close()

客户端代码：

#!/user/bin/env python
# -*- coding:utf-8 -*-
import socket
import os
obj = socket.socket()
obj.connect((‘127.0.0.1‘, 8080, ))
ret_bytes = obj.recv(1024)
ret_str = str(ret_bytes, encoding=‘utf-8‘)
print(ret_str)
size = os.stat(‘1.jpg‘).st_size
obj.sendall(bytes(str(size), encoding=‘utf-8‘))
obj.recv(1024)
with open(‘1.jpg‘, ‘rb‘) as f:
    for line in f:
        obj.sendall(line)
obj.close()