网络编程之粘包(代码片段)

from socket import *
phone = socket(AF_INET,SOCK_STREAM)
phone.setsockopt(SOL_SOCKET,SOCK_STREAM,1)
phone.bind((\'127.0.0.1\',8080))
phone.listen(5)
print(\'start running...\')

coon,addr = phone.accept() #等待连接

data1 = coon.recv(10)
data2 = coon.recv(10)

print(\'------------>\',data1.decode(\'utf-8\'))
print(\'------------>\',data2.decode(\'utf-8\'))
coon.close()
phone.close()

from socket import *
import time
phone = socket(AF_INET,SOCK_STREAM)
phone.connect((\'127.0.0.1\',8080))

phone.send(\'hello\'.encode(\'utf-8\'))
phone.send(\'helloworld\'.encode(\'utf-8\'))
phone.close()

from socket import *
phone = socket(AF_INET,SOCK_STREAM)
phone.setsockopt(SOL_SOCKET,SOCK_STREAM,1)
phone.bind((\'127.0.0.1\',8080))
phone.listen(5)
print(\'start running...\')

coon,addr = phone.accept() #等待连接

data1 = coon.recv(2) #一次没有接收完整
data2 = coon.recv(10)  #下一次接收的时候会先取旧的数据,然后取新的
# data3 = coon.recv(1024)  #接收等5秒后的信息
print(\'------------>\',data1.decode(\'utf-8\'))
print(\'------------>\',data2.decode(\'utf-8\'))
# print(\'------------>\',data3.decode(\'utf-8\'))
coon.close()
phone.close()

from socket import *
import time
phone = socket(AF_INET,SOCK_STREAM)
phone.connect((\'127.0.0.1\',8080))

phone.send(\'hello\'.encode(\'utf-8\'))
time.sleep(5)
phone.send(\'haiyan\'.encode(\'utf-8\'))
phone.close()

import socket
import subprocess
import struct
phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM) #买手机
phone.bind((\'127.0.0.1\',8080)) #绑定手机卡
phone.listen(5) #阻塞的最大数
print(\'start runing.....\')
while True: #链接循环
    coon,addr = phone.accept()# 等待接电话
    print(coon,addr)
    while True: #通信循环
        # 收发消息
        cmd = coon.recv(1024) #接收的最大数
        print(\'接收的是：%s\'%cmd.decode(\'utf-8\'))
        #处理过程
        res = subprocess.Popen(cmd.decode(\'utf-8\'),shell = True,
                                          stdout=subprocess.PIPE, #标准输出
                                          stderr=subprocess.PIPE #标准错误
                                )
        stdout = res.stdout.read()
        stderr = res.stderr.read()
        #先发报头(转成固定长度的bytes类型，那么怎么转呢？就用到了struct模块)
        #len(stdout) + len(stderr)#统计数据的长度
        header = struct.pack(\'i\',len(stdout)+len(stderr))#制作报头
        coon.send(header)
        #再发命令的结果
        coon.send(stdout)
        coon.send(stderr)
    coon.close()
phone.close()

import socket
import struct
phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
phone.connect((\'127.0.0.1\',8080)) #连接服
while True:
    # 发收消息
    cmd = input(\'请你输入命令>>：\').strip()
    if not cmd:continue
    phone.send(cmd.encode(\'utf-8\')) #发送
    #先收报头
    header_struct = phone.recv(4) #收四个
    unpack_res = struct.unpack(\'i\',header_struct)
    total_size = unpack_res[0]  #总长度
    #后收数据
    recv_size = 0
    total_data=b\'\'
    while recv_size<total_size: #循环的收
        recv_data = phone.recv(1024) #1024只是一个最大的限制
        recv_size+=len(recv_data) #
        total_data+=recv_data #
    print(\'返回的消息：%s\'%total_data.decode(\'gbk\'))
phone.close()

import socket
import subprocess
import struct
import json
phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM) #买手机
phone.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
phone.bind((\'127.0.0.1\',8080)) #绑定手机卡
phone.listen(5) #阻塞的最大数
print(\'start runing.....\')
while True: #链接循环
    coon,addr = phone.accept()# 等待接电话
    print(coon,addr)
    while True: #通信循环
        # 收发消息
        cmd = coon.recv(1024) #接收的最大数
        print(\'接收的是：%s\'%cmd.decode(\'utf-8\'))
        #处理过程
        res = subprocess.Popen(cmd.decode(\'utf-8\'),shell = True,
                                          stdout=subprocess.PIPE, #标准输出
                                          stderr=subprocess.PIPE #标准错误
                                )
        stdout = res.stdout.read()
        stderr = res.stderr.read()
        # 制作报头
        header_dic = 
            \'total_size\': len(stdout)+len(stderr),  # 总共的大小
            \'filename\': None,
            \'md5\': None
        
        header_json = json.dumps(header_dic) #字符串类型
        header_bytes = header_json.encode(\'utf-8\')  #转成bytes类型(但是长度是可变的)
        #先发报头的长度
        coon.send(struct.pack(\'i\',len(header_bytes))) #发送固定长度的报头
        #再发报头
        coon.send(header_bytes)
        #最后发命令的结果
        coon.send(stdout)
        coon.send(stderr)
    coon.close()
phone.close()

import socket
import struct
import json
phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
phone.connect((\'127.0.0.1\',8080)) #连接服务器
while True:
    # 发收消息
    cmd = input(\'请你输入命令>>：\').strip()
    if not cmd:continue
    phone.send(cmd.encode(\'utf-8\')) #发送
    #先收报头的长度
    header_len = struct.unpack(\'i\',phone.recv(4))[0]  #吧bytes类型的反解
    #在收报头
    header_bytes = phone.recv(header_len) #收过来的也是bytes类型
    header_json = header_bytes.decode(\'utf-8\')   #拿到json格式的字典
    header_dic = json.loads(header_json)  #反序列化拿到字典了
    total_size = header_dic[\'total_size\']  #就拿到数据的总长度了
    #最后收数据
    recv_size = 0
    total_data=b\'\'
    while recv_size<total_size: #循环的收
        recv_data = phone.recv(1024) #1024只是一个最大的限制
        recv_size+=len(recv_data) #有可能接收的不是1024个字节，或许比1024多呢，
        # 那么接收的时候就接收不全，所以还要加上接收的那个长度
        total_data+=recv_data #最终的结果
    print(\'返回的消息：%s\'%total_data.decode(\'gbk\'))
phone.close()

#该模块可以把一个类型，如数字，转成固定长度的bytes类型
import struct
res = struct.pack(\'i\',12345)
print(res,len(res),type(res))  #长度是4

res2 = struct.pack(\'i\',12345111)
print(res,len(res),type(res2))  #长度也是4

unpack_res =struct.unpack(\'i\',res2)
print(unpack_res)  #(12345111,)
print(unpack_res[0]) #12345111

struct