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# 1 .黏包现象   发送的两个数据黏在一起
#2 .成因
    #发送端粘：和包机制
    #接受端粘 ：接受不及时
    #数据与数据是无边界的流逝传输
# 3解决黏包
    #自定义协议
        #struct模块
            #把任意长度的数据变成固定的4个字节
        #低级
            #先发送数据长度
            #在发送数据
        #高级
            #先把所有相发送的数据信息放在字典
            #发送字典的长度
            #发送字典
            #发送设计的数据
#作业
    #1 默写 黏包协议
    #2 上传大文件 视频 文件 图片
            # 4个g
    #3 和你同桌 调通从你的计算机上传一个视频到你同桌电脑
    #4 进阶 ： 带上登录 先登录 在上传
    
    

登录：

import sys
import json
import socket
import hashlib

def get_md5(username,password):
    md5 = hashlib.md5(username.encode('utf-8'))
    md5.update(password.encode('utf-8'))
    return md5.hexdigest()

def login(dic_msg):
    print(dic_msg['user'], dic_msg['pwd'])
    with open('userinfo', encoding='utf-8') as f:
        for line in f:
            user, pwd = line.strip().split('|')
            print(pwd,get_md5(dic_msg['user'], dic_msg['pwd']))
            if user == dic_msg['user'] and pwd == get_md5(dic_msg['user'], dic_msg['pwd']):
                return {'opt':'login','result':True}
        else:return {'opt':'login','result':False}

sk= socket.socket()
sk.bind(('127.0.0.1',9001))
sk.listen()
while True:
    conn,addr = sk.accept()
    msg = conn.recv(1024).decode('utf-8')
    dic_msg = json.loads(msg)
    if hasattr(sys.modules[__name__],dic_msg['operate']):
        ret = getattr(sys.modules[__name__],dic_msg['operate'])(dic_msg)
        content = json.dumps(ret).encode('utf-8')
        conn.send(content)
    conn.close()
sk.close()

import json
import socket
import hashlib

def get_md5(username,password):
    md5 = hashlib.md5(username[::2].encode('utf-8'))
    md5.update(password.encode('utf-8'))
    return md5.hexdigest()
username = input('用户名 :')
password = input('密  码 :')
sk = socket.socket()
sk.connect(('127.0.0.1',9001))
msg = {'operate':'login',
       'user':username,
       'pwd':get_md5(username,password)}
str_msg = json.dumps(msg)
sk.send(str_msg.encode('utf-8'))
content = sk.recv(1024)
str_content = content.decode('utf-8')
dic_content = json.loads(str_content)
if dic_content['result']:
    print('登录成功')
else:
    print('登录失败')
sk.close()

usrinfo:

alex|ee838c58e5bb3c9e687065edd0ec454f

一对多聊天：

import json
import socket

sk = socket.socket(type=socket.SOCK_DGRAM)
sk.bind(('127.0.0.1',9001))
user_info = {
    1234:('alex','33[1;32m'),
    5678:('宝元','33[1;31m'),
}
while True:
    msg,addr = sk.recvfrom(1024)
    str_msg = msg.decode('utf-8')
    dic_msg = json.loads(str_msg)
    code = dic_msg['code']
    content = dic_msg['msg']
    print('%s%s : %s33[0m'%(user_info[code][1],user_info[code][0],content))
    ret = input('>>>').encode('utf-8')
    sk.sendto(ret,addr)
sk.close()

import json
import socket

sk = socket.socket(type=socket.SOCK_DGRAM)
addr = ('127.0.0.1',9001)
code = 5678
while True:
    msg = input('>>>')
    if msg.upper() == 'Q': break
    send_msg = {'code':code,'msg':msg}
    str_msg = json.dumps(send_msg)
    sk.sendto(str_msg.encode('utf-8'),addr)
    ret = sk.recv(1024).decode('utf-8')
    if ret.upper() == 'Q': break
    print(ret)
sk.close()

import json
import socket

sk = socket.socket(type=socket.SOCK_DGRAM)
addr = ('127.0.0.1',9001)
code = 1234
while True:
    msg = input('>>>')
    if msg.upper() == 'Q':break
    send_msg = {'code':code,'msg':msg}
    str_msg = json.dumps(send_msg)
    sk.sendto(str_msg.encode('utf-8'),addr)
    ret = sk.recv(1024).decode('utf-8')
    if ret.upper() == 'Q':break
    print(ret)
sk.close()

黏包server

import struct
import socket

sk = socket.socket()
sk.bind(('127.0.0.1',9001))
sk.listen()

conn,addr = sk.accept()
num = conn.recv(4)
num = struct.unpack('i',num)[0]
file_name = conn.recv(num).decode('utf-8')
filesize = conn.recv(4)
filesize = struct.unpack('i',filesize)[0]
with open(file_name,'wb') as f:
    content = conn.recv(filesize)
    f.write(content)

conn.close()
sk.cl

import struct
import socket

sk = socket.socket()
sk.bind(('127.0.0.1',9001))
sk.listen()

conn,addr = sk.accept()
num = conn.recv(4)
print(num)  #b'x0bx00x00x00'
num = struct.unpack('i',num)[0] #元组第一个元素 后面的是点
# num1 = struct.unpack('i',num)[1] #元组第一个元素 后面的是点
print(num)  #11
# print(num1)
file_name = conn.recv(num).decode('utf-8')
print(file_name)#2.作业.py
filesize = conn.recv(4)
print(filesize)#b'Hx01x00x00'
filesize = struct.unpack('i',filesize)[0]
print(filesize)#328
with open(file_name,'wb') as f:
    content = conn.recv(filesize)
    f.write(content)
conn.close()
sk.close()

import struct
import socket

sk = socket.socket()
sk.bind(('127.0.0.1',9001))
sk.listen()

conn,addr = sk.accept()
num = conn.recv(4)
print(num)  #b'x0bx00x00x00'
num = struct.unpack('i',num)[0] #元组第一个元素 后面的是点
# num1 = struct.unpack('i',num)[1] #元组第一个元素 后面的是点
print(num)  #11
# print(num1)
file_name = conn.recv(num).decode('utf-8')
print(file_name)#2.作业.py
filesize = conn.recv(4)
print(filesize)#b'Hx01x00x00'
filesize = struct.unpack('i',filesize)[0]
print(filesize)#328
with open(file_name,'wb') as f:
    content = conn.recv(filesize)
    f.write(content)
conn.close()
sk.close()

str 字符串　　 字节bytes   dumps 倾倒 load 装入

a = '中文'.encode('utf-8')#encode 一下就是bytes 类型的
print(a,type(a))#b'xe4xb8xadxe6x96x87' <class 'bytes'>
b = a.decode('utf-8')   #decode 一下就是str类型的
print(b,type(b))    #中文 <class 'str'>
# dunps#倾倒  load#装入
a = {'1':2,'2':3}
import json
b = json.dumps(a)       #倾倒乱糟糟一个''
print(b,type(b))#{"1": 2, "2": 3} <class 'str'>
c = json.loads(b)       #装入有规律的字典
print(c,type(c))#{'1': 2, '2': 3} <class 'dict'>

send 发送 必须是bytes  b''  和  i.encode('utf-8')  接受解码 成字符串 decode

 字典类型

import json
import struct
import socket

sk = socket.socket()
sk.bind(('127.0.0.1',9001))
sk.listen()

conn,addr = sk.accept()
num = conn.recv(4)
num = struct.unpack('i',num)[0]
str_dic = conn.recv(num).decode('utf-8')
dic = json.loads(str_dic)
with open(dic['filename'],'wb') as f:
    content = conn.recv(dic['filesize'])
    f.write(content)

conn.close()
sk.close()

import os
import json
import struct
import socket

sk = socket.socket()
sk.connect(('127.0.0.1',9001))

filepath  = input('请输入文件路径 :')
filename = os.path.basename(filepath)
filesize = os.path.getsize(filepath)
dic = {'filename':filename,'filesize':filesize}
str_dic = json.dumps(dic)
bytes_dic = str_dic.encode('utf-8')
len_dic = len(bytes_dic)
bytes_len = struct.pack('i',len_dic)
sk.send(bytes_len)
sk.send(bytes_dic)
with open(filepath,'rb') as f:
    content = f.read()
    sk.send(content)
sk.close()

# 先发送字典的长度
# 再发字典 {'filename':xxxx,'filesize':xxxxx}
# 再发文件内容

import json
import struct
import socket

sk = socket.socket()
sk.bind(('127.0.0.1',9001))
sk.listen()

conn,addr = sk.accept()
num = conn.recv(4)
num = struct.unpack('i', num)[0]
str_dic = conn.recv(num).decode('utf-8')
dic = json.loads(str_dic)
with open(dic['filename'],'wb') as f:
    content = conn.recv(dic['filesize'])
    f.write(content)

conn.close()
sk.close()