import socket
import os
import hashlib
client = socket.socket() # 生成socket，连接server
ip_port =("192.168.137.210",12346) # server地址和端口号（最好是10000以后）
client.connect(ip_port) # 连接
print("服务器已连接")
while True:
 content = input(">>")
if len(content)==0: continue # 如果传入空字符会阻塞
if content.startswith("get"): 
client.send(content.encode("utf-8")) # 传送和接收都是bytes类型
 # 1.先接收长度，建议8192
server_response = client.recv(1024)
file_size = int(server_response.decode("utf-8")) 
print("接收到的大小：",file_size)

# 2.接收文件内容
client.send("准备好接收".encode("utf-8")) # 确认接收
filename = "new" + content.split(" ")[1]
f = open(filename, "wb")
 received_size = 0
m = hashlib.md5()
 while received_size < file_size:
   size = 0 # 准确接收数据大小，解决粘包
  if file_size - received_size >1024: # 多次接收
   size = 1024
  else: # 最后一次接收完毕
   size = file_size - received_size
  data = client.recv(size) # 多次接收内容，接收大数据
  data_len = len(data)
  received_size += data_len
  print("已接收：", int(received_size/file_size*100), "%"）
  m.update(data)
  f.write(data)  
f.close() 
print("实际接收的大小:", received_size) # 解码

# 3.md5值校验
md5_sever = client.recv(1024).decode("utf-8")  
md5_client = m.hexdigest()  
 print("服务器发来的md5:",md5_sever) 
 print("接收文件的md5:",md5_client) 
if md5_sever == md5_client:
  print("MD5值校验成功") 
else:
  print("MD5值校验失败")
client.close()

import socket
import os
import hashlib

server = socket.socket()
server.bind(("192.168.137.96", 12346)) # 地址与端口
server.listen(5) 
print("等待连接..")
while True:
conn, addr =server.accept() # 等待连接 
print("conn:", conn, "\naddr:", addr) # conn连接实例
while True:
 data =conn.recv(1024) # 接收
 if not data: # 客户端已断开  
print("客户端断开连接")   
break 
print("收到的命令：", data.decode("utf-8"))
 cmd, filename = data.decode("utf-8").split(" ")
 if cmd=="get":
  if os.path.isfile(filename): # 判断文件存在     
size = os.stat(filename).st_size 
#获取文件大小
conn.send(str(size).encode("utf-8")) # 发送数据长度    
print("发送的大小：", size)       
conn.recv(1024) # 接收确认   
m = hashlib.md5()   
 f = open(filename, "rbname") 
for line in f:
conn.send(line) # 发送数据     
m.update(line)
    f.close()     
md5 = m.hexdigest()   
conn.send(md5.encode("utf-8"))    
print("md5:", md5)
server.close()

python client.py
python server.py