sock实现通讯(TCP)

sock实现通讯（TCP）

单次单用户通讯

#server端
import socket

sk = socket.socket() #买手机
sk.bind(("127.0.0.1",9000)) #绑定手机号，或者本机ip
sk.listen()  #开机

conn,addr = sk.accept() #等着接电话
conn.send(b"hello")     #发送内容
msg = conn.recv(1024) #所最大接受字符为1024
print(msg)
conn.close() #挂电话，连接关闭
sk.close() #关机


#clinet端
import socket
sk = socket.socket()
sk.connect(("127.0.0.1",9000))

msg = sk.recv(1024) #接受
print(msg)          #呈现接受的内容
sk.send(b"byebye")  #发送的 内容
sk.close()

socket（套接字）

• 工作在应用层和传输层之间的抽象层
  • 帮助我们完成了所有信息的组织和拼接
• sokcet对于程序员来说，已经是网络操作的底层

多次单用户通讯

#sever端
import socket
sk = socket.socket()
sk.bind(("127.0.0.1",9000))
sk.listen()
print("*"*20)
conn,addr = sk.accept() #阻塞
while True:
    msg = conn.recv(1024).decode("utf-8")
    print(msg)
    if msg.upper() == "Q":break
    inp = input(">>>")
    conn.send(inp.encode("utf-8"))
    if inp.upper() == "Q":
        break
conn.close()
sk.close()

#cilnet端
import socket
sk = socket.socket()
sk.connect(("127.0.0.1",9000))
while True:
    inp = input(">>>")
    sk.send(inp.encode("utf-8"))
    if inp.upper() == "Q":break
    msg = sk.recv(1024).decode("utf-8")
    if msg.upper() == "Q":break
    print(msg)
sk.close()

多次多用户通讯

#sever端
import socket
sk = socket.socket()
sk.bind(("127.0.0.1",9000))
sk.listen()
print("*"*20)
while True:
    conn,addr = sk.accept() #阻塞
    while True:
        msg = conn.recv(1024).decode("utf-8")
        print(msg)
        if msg.upper() == "Q":break
        inp = input(">>>")
        conn.send(inp.encode("utf-8"))
        if inp.upper() == "Q":
            break
    conn.close()
sk.close()

#client1端
import socket
sk = socket.socket()
sk.connect(("127.0.0.1",9000))
while True:
    inp = input(">>>")
    sk.send(inp.encode("utf-8"))
    if inp.upper() == "Q":break
    msg = sk.recv(1024).decode("utf-8")
    if msg.upper() == "Q":break
    print(msg)
sk.close()


#client2端
import socket
sk = socket.socket()
sk.connect(("127.0.0.1",9000))
while True:
    inp = input(">>>")
    sk.send(inp.encode("utf-8"))
    if inp.upper() == "Q":break
    msg = sk.recv(1024).decode("utf-8")
    if msg.upper() == "Q":break
    print(msg)
sk.close()

带身份带颜色变换的无限多用户通讯

#sever端
import socket
sk = socket.socket()
sk.bind(("127.0.0.1",9000))
sk.listen(5) #n允许多少客户端等待
print("*"*20)
while True:
    conn,addr = sk.accept() #阻塞
    while True:
        msg = conn.recv(1024).decode("utf-8")
        print("\033[0;31m%s\033[0m" % msg)
        if msg.upper() == "Q":break
        inp = input("服务器：")
        conn.send(("服务器："+inp).encode("utf-8"))
        if inp.upper() == "Q":
            break
    conn.close()
sk.close()

#client1端
import socket
sk = socket.socket()
sk.connect(("127.0.0.1",9000))
while True:
    inp = input("小杨：")
    sk.send(("小杨："+inp).encode("utf-8"))
    if inp.upper() == "Q":break
    msg = sk.recv(1024).decode("utf-8")
    if msg.upper() == "Q":break
    print("\033[0;34m%s\033[0m" % msg)
sk.close()


#client2端
import socket
sk = socket.socket()
sk.connect(("127.0.0.1",9000))
while True:
    inp = input("小李：")
    sk.send(("小李"+inp).encode("utf-8"))
    if inp.upper() == "Q":break
    msg = sk.recv(1024).decode("utf-8")
    if msg.upper() == "Q":break
    print(msg)
sk.close()

• TCP通讯练习

  #改变字体颜色，以及绑定识别用户的信息和昵称
  
  #server端
  import socket
  import json
  sk = socket.socket()
  sk.bind(("127.0.0.1",9000))
  sk.listen()
  color_dic = {
      "12345":{"color":"\033[32m","name":"alex"},
      "12346":{"color":"\033[32m","name":"wusir"},
      "12347":{"color":"\033[32m","name":"xiaoyang"}
  }
  conn,_= sk.accept() #阻塞
  while True:
      msg = conn.recv(1024).decode("utf-8")
      dick_msg = json.loads(msg)
      uid = dick_msg["id"]
      if dick_msg["msg"].upper() == "Q":
          print("%s已经下线"%color_dic[uid]["color"])
      print('%s%s:%s\033[0m'%(color_dic[uid]["color"],color_dic[uid]["name"],dick_msg["msg"]))
      inp = input(">>>")
      conn.send(inp.encode("utf-8"))
      if inp.upper() == "Q":
          print("你已断开与%s的聊天"%(color_dic[uid]["name"]))
          break
  conn.close()
  sk.close()
  
  #clinet端
  import socket
  import json
  sk = socket.socket()
  sk.connect(("127.0.0.1",9000))
  id = "12345"
  while True:
      inp = input(">>>")
      dic = {"msg":inp,"id":id}
      str_dic = json.dumps(dic)
      sk.send(str_dic.encode("utf-8"))
      if inp.upper() == "Q":
          print("你已断开和server的聊天")
      msg = sk.recv(1024).decode("utf-8")
      if msg.upper() == "Q":break
  
      print(msg)
  sk.close()
  

基于TCP加密通讯处理

#server端
import json
import socket
import hashlib

sk = socket.socket()
sk.bind(("127.0.0.1",9000))
sk.listen()

def get_md5(username,password):
    md5 = hashlib.md5(username.encode("utf-8")) #动态加盐
    md5.update(password.encode("utf-8")) #哈希运算
    return md5.hexdigest()

conn,_ = sk.accept()
str_dic = conn.recv(1024).decode("utf-8")
dic = json.loads(str_dic)
with open("userinfo",encoding="utf-8")as f:
    for line in f:
        user, passwd = line.strip().split("|")
        if user == dic["usr"] and passwd == get_md5(dic["usr"],dic["pwd"]):
            res_dic = {"opt":"login","result":True}
            break

        else:
            res_dic = {"opt":"login","result":False}
sdic = json.dumps(res_dic)
conn.send(sdic.encode("utf-8"))
conn.close()
sk.close()

#userinfo
alex|431149301c8792c1ab4c40b783d37100 #经过哈希运算的密码



#client端
import socket
import json

user = input("username:")
pwd = input("password:")
dic = {"usr":user,"pwd":pwd}
str_dic = json.dumps(dic)
sk = socket.socket()
sk.connect(("127.0.0.1",9000))

sk.send(str_dic.encode("utf-8"))
ret = sk.recv(1024).decode("utf-8")
ret_dic = json.loads(ret)
if ret_dic["result"]:
    print("登录成功")
else:
    print("登录失败")

sk.close()

基于TCP文件传输

#client端
import socket
import os
import json
sk = socket.socket()
sk.connect(("127.0.0.1",9000))

file_path = input(">>>")
if os.path.isabs(file_path): #判断是否为绝对路径
   filename = os.path.basename(file_path) #获取文件名
   filesize = os.path.getsize(file_path) #获取文件的大小，为文件的接受做准备
   dic = {"filename":filename,"filesize":filesize} #向服务器传出文件的基本信息
   srt_dic = json.dumps(dic)
   sk.send(srt_dic.encode("utf-8"))
   with open(file_path,mode = "rb")as f:
       content = f.read()
       sk.send(content)

sk.close()

sk.close()


#server端
import socket
import json

sk = socket.socket()
sk.bind(("127.0.0.1",9000))
sk.listen()

conn,_ = sk.accept()
str_dic =conn.recv(1024).decode("utf-8")
dic = json.loads(str_dic)
content = conn.recv(dic["filesize"]) #按照文件的大小接受，由于TCP本身的缺陷，文件已损失部分
with open(dic["filename"],mode="wb")as f: #在当前的路径下打开文件
   f.write(content)     #将接受到信息写入

conn.close()
sk.close()




#补充：文件名的获取
import os
filename = r"C:\Users\lenovo\Desktop\医疗健康领域知识图谱的应用现状与挑战"#裸文件名的时候记得加r
# print(filename)
filename = os.path.basename(filename)
print(filename)