python学习——FTP作业

本实例有文件传输相关功能，包括：文件校验、进度条打印、断点续传

客户端示例：

import socket
import json
import os
import hashlib

CODE = {
    '1001':'重新上传文件'
}

def file_md5(file_path):
    obj = open(file_path,'rb')
    m = hashlib.md5()
    for line in obj:
        m.update(line)
    obj.close()
    return m.hexdigest()

def jdt(size,total_size):
    '''
    显示进度条
    '''
    val = int(size/total_size * 100)
    print('
%s%%|%s' %(val,'#'*val,),end='')

def send_file(exist_size,file_total_size):
    '''
    发送文件
    :param exist_size: 开始读取字节的位置
    :param file_total_size: 文件大小
    :return:
    '''
    f = open(file_path, 'rb')
    f.seek(exist_size)
    send_size = exist_size
    while send_size < file_total_size:
        data = f.read(1024)
        sk.sendall(data)
        send_size += len(data)
        jdt(send_size,file_total_size)
    f.close()
    print('上传成功')

def upload(file_path):
    '''文件上传（含断点）'''
    file_path = '111.jpg'
    file_md5_val = file_md5(file_path)
    file_name = os.path.basename(file_path)
    file_size = os.stat(file_path).st_size

    cmd_dict = {'cmd': 'upload', 'file_name': file_name, 'size': file_size, 'md5': file_md5_val}
    upload_cmd_bytes = json.dumps(cmd_dict).encode('utf8')
    sk.sendall(upload_cmd_bytes)

    # 2.等待服务端相应
    response = json.loads(sk.recv(8096).decode('utf8'))
    if response['code'] == 1001:
        send_file(0,file_size)
    else:  # 断点续传
        exist_size = response('size')
        send_file(exist_size,file_size)

sk = socket.socket()
sk.connect(('127.0.0.1',8001))

while 1:
    #upload|文件路径
    user_input = input('命令>>>')
    # 1、自定义协议{'cmd':'upload','file_name':'...'}
    cmd,file_path = user_input.split('|',maxsplit=1)
    if cmd == 'upload':
        upload(file_path)
    elif cmd == 'download':
        pass

服务端示例：

import socketserver
import json
import os
import shutil

CODE = {
    '1001':'重新上传文件'
}

def upload(cmd_dict,conn,username):
    '''服务端完成上传文件（含断点续传）'''
    # 2.获取文件信息
    file_md5 = cmd_dict['md5']
    file_name = cmd_dict['file_name']
    file_md5_path = os.path.join('home', username, file_md5)
    file_name_path = os.path.join('home', username, file_name)
    upload_file_size = cmd_dict['size']

    # 3.判断文件是否存在
    exist = os.path.exists(file_md5_path)
    if not exist:  # 不续传
        # 3.1.1通知可以开始上传，已经准备好
        response = {'code': 1001}
        conn.sendall(json.dumps(response).encode('utf8'))

        # 3.1.2接收上传的文件内容
        f = open(file_md5_path, 'wb')
        recv_size = 0
        while recv_size < upload_file_size:
            data = conn.recv(1024)
            f.write(data)  # 写到内存
            f.flush()  # 刷到硬盘
            recv_size += len(data)
        f.close()

        # 3.1.3改文件名
        shutil.move(file_md5_path, file_name_path)

    else:  # 存在就续传
        # 3.2续传 + 大小
        exist_size = os.stat(file_md5_path).st_size
        response = {'code': 1002, 'size': exist_size}
        conn.sendall(json.dumps(response).encode('utf8'))

        f = open(file_md5_path, 'ab')
        recv_size = exist_size
        while recv_size < upload_file_size:
            data = conn.recv(1024)
            f.write(data)  # 写到内存
            f.flush()  # 刷到硬盘
            recv_size += len(data)
        f.close()

        # 3.1.3改文件名
        shutil.move(file_md5_path, file_name_path)


class NBServer(socketserver.BaseRequestHandler):
    def handle(self):
        '''self.request是请求客户端的socket对象'''

        #1.接受命令
        upload_cmd_bytes = self.request.recv(8096)
        cmd_dict = json.loads(upload_cmd_bytes.decode('utf8'))

        if cmd_dict['cmd'] == 'upload':
            upload(cmd_dict,self.request,'zhangzijian')
        elif cmd_dict['cmd'] == 'download':
            pass

if __name__ == '__main__':
    server = socketserver.ThreadingTCPServer(('127.0.0.1',8001),NBServer)
    server.serve_forever()