1.在linux中经常出现粘包的出现（因为两个send近靠着，造成接受到的数据是在一起的。）解决方法：
在服务端两send的中间中再添加一个recv(),客户端添加一个send(),服务端收到信息确认客户端已经收到第一个send发送的信息后，再发送第二个send中的内容。
2.需求： 客户端向linux服务端传送get指令，将服务端get到的数据传送到客户端，通过md5 验证传送后的数据是否正确，最后一次数据剩多少传输多少，防止数据粘包。
#coding:utf-8
'''客户端'''
import socket
import hashlib client = socket.socket() client.connect(('192.168.121.129', 9999)) while True:
cmd = input(">>:").strip()
if len(cmd) == 0: continue
if cmd.startswith("get"):
client.send(cmd.encode())
server_response = client.recv(1024)
print("servr response:", server_response)
client.send(b"ready to recv file")
file_total_size = int(server_response.decode())
received_size = 0
filename = cmd.split()[1]
f = open(filename + ".new", "wb")
m = hashlib.md5() while received_size < file_total_size:
if file_total_size - received_size > 1024: # 要收不止一次
size = 1024
else: # 最后一次了，剩多少收多少
size = file_total_size - received_size
print("last receive:", size) data = client.recv(size)
received_size += len(data)
m.update(data)
f.write(data)
# print(file_total_size,received_size)
else:
new_file_md5 = m.hexdigest()
print("file recv done", received_size, file_total_size)
f.close()
server_file_md5 = client.recv(1024)
print("server file md5:", server_file_md5)
print("client file md5:", new_file_md5) client.close()
#coding:utf-8
'''服务端'''
import hashlib
import socket ,os,time
server = socket.socket()
server.bind(('0.0.0.0',9999) )
server.listen(5)
while True:
conn, addr = server.accept()
print("new conn:",addr)
while True:
print("等待新指令")
data = conn.recv(1024)
if not data:
print("客户端已断开")
break
cmd,filename = data.decode().split()
print(filename)
if os.path.isfile(filename):
f = open(filename,"rb")
m = hashlib.md5()
file_size = os.stat(filename).st_size
conn.send( str(file_size).encode() ) #send file size
conn.recv(1024) #wait for ack
for line in f:
m.update(line)
conn.send(line)
print("file md5", m.hexdigest())
f.close()
conn.send(m.hexdigest().encode()) #send md5
print("send done") server.close()