峰哥解决粘包的方式

import json, struct

# 假设通过客户端上传1T:1073741824000的文件a.txt

# 为避免粘包,必须自定制报头
header = {‘file_size‘: 1073741824000, ‘file_name‘: ‘/a/b/c/d/e/a.txt‘,
          ‘md5‘: ‘8f6fbf8347faa4924a76856701edb0f3‘}  # 1T数据,文件路径和md5值

# 为了该报头能传送,需要序列化并且转为bytes
head_bytes = bytes(json.dumps(header), encoding=‘utf-8‘)  # 序列化并转成bytes,用于传输

# 为了让客户端知道报头的长度,用struck将报头长度这个数字转成固定长度:4个字节
head_len_bytes = struct.pack(‘i‘, len(head_bytes))  # 这4个字节里只包含了一个数字,该数字是报头的长度

# 客户端开始发送
conn.send(head_len_bytes)  # 先发报头的长度,4个bytes
conn.send(head_bytes)  # 再发报头的字节格式
conn.sendall(文件内容)  # 然后发真实内容的字节格式

# 服务端开始接收
head_len_bytes = s.recv(4)  # 先收报头4个bytes,得到报头长度的字节格式
x = struct.unpack(‘i‘, head_len_bytes)[0]  # 提取报头的长度

head_bytes = s.recv(x)  # 按照报头长度x,收取报头的bytes格式
header = json.loads(json.dumps(header))  # 提取报头

# 最后根据报头的内容提取真实的数据,比如
real_data_len = s.recv(header[‘file_size‘])
s.recv(real_data_len)

# struct的用法
# _*_coding:utf-8_*_
# http://www.cnblogs.com/coser/archive/2011/12/17/2291160.html
__author__ = ‘Linhaifeng‘
import struct
import binascii
import ctypes

values1 = (1, ‘abc‘.encode(‘utf-8‘), 2.7)
values2 = (‘defg‘.encode(‘utf-8‘), 101)
s1 = struct.Struct(‘I3sf‘)
s2 = struct.Struct(‘4sI‘)

print(s1.size, s2.size)
prebuffer = ctypes.create_string_buffer(s1.size + s2.size)
print(‘Before : ‘, binascii.hexlify(prebuffer))
# t=binascii.hexlify(‘asdfaf‘.encode(‘utf-8‘))
# print(t)


s1.pack_into(prebuffer, 0, *values1)
s2.pack_into(prebuffer, s1.size, *values2)

print(‘After pack‘, binascii.hexlify(prebuffer))
print(s1.unpack_from(prebuffer, 0))
print(s2.unpack_from(prebuffer, s1.size))

s3 = struct.Struct(‘ii‘)
s3.pack_into(prebuffer, 0, 123, 123)
print(‘After pack‘, binascii.hexlify(prebuffer))
print(s3.unpack_from(prebuffer, 0))

# 服务端
import socket, struct, json
import subprocess

phone = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
phone.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)  # 就是它，在bind前加

phone.bind((‘127.0.0.1‘, 8080))

phone.listen(5)

while True:
    conn, addr = phone.accept()
    while True:
        cmd = conn.recv(1024)
        if not cmd: break
        print(‘cmd: %s‘ % cmd)

        res = subprocess.Popen(cmd.decode(‘utf-8‘),
                               shell=True,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE)
        err = res.stderr.read()
        print(err)
        if err:
            back_msg = err
        else:
            back_msg = res.stdout.read()

        conn.send(struct.pack(‘i‘, len(back_msg)))  # 先发back_msg的长度
        conn.sendall(back_msg)  # 在发真实的内容

    conn.close()

# 客户端
# _*_coding:utf-8_*_
__author__ = ‘Linhaifeng‘
import socket, time, struct

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
res = s.connect_ex((‘127.0.0.1‘, 8080))

while True:
    msg = input(‘>>: ‘).strip()
    if len(msg) == 0: continue
    if msg == ‘quit‘: break

    s.send(msg.encode(‘utf-8‘))

    l = s.recv(4)
    x = struct.unpack(‘i‘, l)[0]
    print(type(x), x)
    # print(struct.unpack(‘I‘,l))
    r_s = 0
    data = b‘‘
    while r_s < x:
        r_d = s.recv(1024)
        data += r_d
        r_s += len(r_d)

    # print(data.decode(‘utf-8‘))
    print(data.decode(‘gbk‘))  # windows默认gbk编码

#服务端定制复杂的报头
import socket, struct, json
import subprocess

phone = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
phone.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)  # 就是它，在bind前加

phone.bind((‘127.0.0.1‘, 8080))

phone.listen(5)

while True:
    conn, addr = phone.accept()
    while True:
        cmd = conn.recv(1024)
        if not cmd: break
        print(‘cmd: %s‘ % cmd)

        res = subprocess.Popen(cmd.decode(‘utf-8‘),
                               shell=True,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE)
        err = res.stderr.read()
        print(err)
        if err:
            back_msg = err
        else:
            back_msg = res.stdout.read()

        headers = {‘data_size‘: len(back_msg)}
        head_json = json.dumps(headers)
        head_json_bytes = bytes(head_json, encoding=‘utf-8‘)

        conn.send(struct.pack(‘i‘, len(head_json_bytes)))  # 先发报头的长度
        conn.send(head_json_bytes)  # 再发报头
        conn.sendall(back_msg)  # 在发真实的内容

    conn.close()

# 客户端
from socket import *
import struct, json

ip_port = (‘127.0.0.1‘, 8080)
client = socket(AF_INET, SOCK_STREAM)
client.connect(ip_port)

while True:
    cmd = input(‘>>: ‘)
    if not cmd: continue
    client.send(bytes(cmd, encoding=‘utf-8‘))

    head = client.recv(4)
    head_json_len = struct.unpack(‘i‘, head)[0]
    head_json = json.loads(client.recv(head_json_len).decode(‘utf-8‘))
    data_len = head_json[‘data_size‘]

    recv_size = 0
    recv_data = b‘‘
    while recv_size < data_len:
        recv_data += client.recv(1024)
        recv_size += len(recv_data)

    print(recv_data.decode(‘utf-8‘))
    # print(recv_data.decode(‘gbk‘)) #windows默认gbk编码