python基础--socket套接字、粘包问题

import socket
?
server = socket.socket()  # 就比如买了一个手机
server.bind(("127.0.0.1",8080))  # bind中绑定的是IP地址和端口号，注意是一个元组，就比如，将手机卡，插入了手机
server.listen(5)  # 半连接池，最大等待连接数为5个，就比如开机
conn,address = server.accept()  # 接听电话等着别人给你打电话
?
date = conn.recv(1024)  # 听别人说话，接收1023个字节数
print(date)
conn.send(b"hello")  # 给别人回话
?
?
conn.close()  # 挂断电话
server.close()  # 关机

import socket
?
client = socket.socket()  #拿电话
client.connect(("127.0.0.1",8080))  #绑定的是IP地址和端口号，也是一个元组 拨号
?
client.send(b"hello")  # 对别人发消息
?
date = client.recv(1024)  #接收别人说话，没次接收1024个字节
print(date)
?
client.close()  # 挂电话

import socket
?
server = socket.socket()  # 就比如买了一个手机
server.bind(("127.0.0.1",8088))  # bind中绑定的是IP地址和端口号，注意是一个元组，就比如，将手机卡，插入了手机
server.listen(5)  # 半连接池，最大等待连接数为5个，就比如开机
conn,address = server.accept()  # 接听电话等着别人给你打电话
?
date = conn.recv(1024)  # 听别人说话，接收1023个字节数
print(date)
date = conn.recv(1024)  # 听别人说话，接收1023个字节数
print(date)
?
?
conn.close()  # 挂断电话
server.close()  # 关机

import socket
?
client = socket.socket()  #拿电话
client.connect(("127.0.0.1",8088))  #绑定的是IP地址和端口号，也是一个元组 拨号
?
client.send(b"hello")  # 对别人发消息
client.send(b"hello")  # 对别人发消息
?
?
client.close()  # 挂电话

b‘hellohello‘

import struct
?
?
print("--------------------------1--------------------------")
msg = "asdasdasdasdasd"
print("原字符串的长度")
print(len(msg))
?
handler = struct.pack("i",len(msg))
print("创建报头的长度")
print(len(handler))
?
?
res = struct.unpack("i",handler)[0]
print("解报头过后的长度")
print(res)
?
?
?
?
?
print("--------------------------2--------------------------")
?
msg1 = "asdasdasdasdasdasdasdasd"
print("原字符串的长度")
print(len(msg1))
?
handler1 = struct.pack("i",len(msg1))
print("创建报头的长度")
print(len(handler1))
?
?
res1 = struct.unpack("i",handler1)[0]
print("解报头过后的长度")
print(res1)
?
"""
--------------------------1--------------------------
原字符串的长度
15
创建报头的长度
4
解报头过后的长度
15
--------------------------2--------------------------
原字符串的长度
24
创建报头的长度
4
解报头过后的长度
24
"""

import json
import os
import socket
import struct

server_path = r‘/Users/mac/Documents/client-server/server_movie‘

server = socket.socket()

ip_port = (‘127.0.0.1‘, 8080)

server.bind(ip_port)

server.listen(5)

conn, addr = server.accept()
while 1:

    head_len = conn.recv(4)

    head_len = struct.unpack(‘i‘, head_len)[0]

    json_head = conn.recv(head_len).decode(‘utf-8‘)

    head = json.loads(json_head)

    file_size = head[‘file_size‘]

    with open(os.path.join(server_path, head[‘file_name‘]), ‘wb‘) as f:
        while file_size:
            if file_size >= 1024:
                content = conn.recv(1024)
                f.write(content)
                file_size -= 1024
            else:
                content = conn.recv(file_size)
                f.write(content)
                break

import os
import socket
import json
import struct

client = socket.socket()

ip_port = (‘127.0.0.1‘, 8080)

client.connect(ip_port)

head = {
    ‘file_path‘: r‘/Users/mac/Documents/client-server/client_movie‘,
    ‘file_name‘: None,
    ‘file_size‘: None
}
movie_list = os.listdir(head[‘file_path‘])

while 1:
    for i, m in enumerate(movie_list, 1):
        print(‘%s --> %s‘ % (i, m))
    choice = input(‘please input movie number:>>‘).strip()
    if choice.isdigit():
        choice = int(choice)
        if choice in range(1, len(movie_list) + 1):
            movie_name = movie_list[choice - 1]
            head[‘file_name‘] = movie_name
            head[‘file_size‘] = os.path.getsize(os.path.join(head[‘file_path‘], head[‘file_name‘]))
            json_head = json.dumps(head).encode(‘utf-8‘)
            bytes_head = len(json_head)
            pack_head = struct.pack(‘i‘, bytes_head)
            client.send(pack_head)
            client.send(json_head)
            file_size = head[‘file_size‘]
            with open(os.path.join(head[‘file_path‘], head[‘file_name‘]), ‘rb‘) as f:
                while file_size:
                    if file_size >= 1024:
                        content = f.read(1024)
                        client.send(content)
                        file_size -= 1024
                    else:
                        content = f.read(file_size)
                        client.send(content)
                        print("finish")
                        break
        else:
            print(‘index out of range‘)
    else:
        print(‘input number...‘)