from threading import Thread
from socket import *
import structdef upload(filename,user_ip,user_port):num = 0f = open(filename,'ab') s_up = socket(AF_INET,SOCK_DGRAM)send_data_1 = struct.pack("!HH",4,num)s_up.sendto(send_data_1,(user_ip,user_port))  #第一次用随机端口发送while True:recv_data,user_info = s_up.recvfrom(1024)  #第二次客户连接我随机端口caozuohao_up,ack_num = struct.unpack('!HH',recv_data[:4])print(caozuohao_up,ack_num,num)if int(caozuohao_up) == 3 and ack_num == num :f.write(recv_data[4:])send_data = struct.pack("!HH",4,num)s_up.sendto(send_data,(user_ip,user_port)) #第二次我用随机端口发num = num + 1if len(recv_data) < 516:print(user_ip+'上传文件'+filename+':完成')f.close()exit()def download(filename,user_ip,user_port):s_down = socket(AF_INET, SOCK_DGRAM)num = 0try:f = open(filename,'rb')except:error_data = struct.pack('!HHHb',5,5,5,num)s_down.sendto(error_data, (user_ip,user_port))  #文件不存在时发送exit()  #只会退出此线程while True:read_data = f.read(512)send_data = struct.pack('!HH',3,num) + read_datas_down.sendto(send_data, (user_ip,user_port))  #数据第一次发送if len(read_data) < 512:print('传输完成, 对方下载成功')exit()        recv_ack =  s_down.recv(1024)  #第二次接收caozuoma,ack_num = struct.unpack("!HH", recv_ack)
#        print(caozuoma,ack_num,len(read_data))num += 1if int(caozuoma) != 4 or int(ack_num) != num-1 :exit()f.close()s = socket(AF_INET,SOCK_DGRAM)
s.bind(('',69))def main():while 1:recv_data,(user_ip,user_port) = s.recvfrom(1024)  #第一次客户连接69端口print(recv_data, user_ip, user_port)if struct.unpack('!b5sb',recv_data[-7:]) == (0, b'octet', 0):caozuoma = struct.unpack('!H',recv_data[:2])filename = recv_data[2:-7].decode('gb2312')if caozuoma[0] == 1:print('对方想下载数据',filename)t = Thread(target = download, args = (filename,user_ip,user_port)) t.start()           elif caozuoma[0] == 2:print('对方想上传数据',filename)t = Thread(target = upload, args = (filename,user_ip,user_port)) t.start()           if __name__ == '__main__':main()

#!/usr/bin/env python3
#coding=utf-8import struct
from socket import *server_ip = '192.168.119.157'
send_data_1 = struct.pack('!H8sb5sb',2,'王辉.jpg'.encode('gb2312'),0,b'octet',0)
s = socket(AF_INET,SOCK_DGRAM)
s.sendto(send_data_1,(server_ip,69)) #第一次发给服务器69端口

f = open('王辉.jpg','rb')recv_data = s.recvfrom(1024) #第一次接收数据
rand_port = recv_data[1][1]
print()
ack_num = struct.unpack("!HH",recv_data[0][:4])
num = 0
while True:read_data = f.read(512)send_data = struct.pack('!HH',3,num) + read_datas.sendto(send_data,(server_ip,rand_port)) #第二次发给服务器的随机端口recv_data_2,userinfo = s.recvfrom(1024)print(recv_data_2)ack_num = struct.unpack('!H',recv_data_2[2:4])print(len(read_data),num,ack_num[0],rand_port)if len(read_data) < 512 or ack_num[0] != num :breaknum = num + 1

#!/usr/bin/env python3
#coding=utf-8import struct
from socket import *filename = 'test.jpg'
server_ip = '192.168.1.113'send_data = struct.pack('!H%dsb5sb'%len(filename),1,filename.encode('gb2312'),0,'octet'.encode('gb2312'),0)
s = socket(AF_INET,SOCK_DGRAM)
s.sendto(send_data,(server_ip,69)) #第一次发送, 连接服务器69端口

f = open(filename,'ab')while 1:recv_data = s.recvfrom(1024) #接收数据caozuoma,ack_num = struct.unpack('!HH',recv_data[0][:4]) #获取数据块编号rand_port = recv_data[1][1]  #获取服务器的随机端口if int(caozuoma) == 5:print('服务器返回: 文件不存在...')breakprint(caozuoma,ack_num,rand_port,len(recv_data[0]))f.write(recv_data[0][4:])if len(recv_data[0]) < 516:breakack_data = struct.pack("!HH",4,ack_num)s.sendto(ack_data,(server_ip,rand_port))  #回复ACK确认包