文件传输, socketserver模块

一. 文件传输

 # ===================================== 服务器端 =====================================
 # 思路: 做一个要穿的内容的字典, 计算字典的长度, 然后发送字典的长度和字典的json的字符串, 再发送内容
import struct
import socket
import json
import hashlib

sock=socket.socket()
sock.bind(('127.0.0.1',8800))
sock.listen(5)



while 1:
    print("server is working....")
    conn,addr= sock.accept()
    while 1:

        # 接收json的打包长度
        file_info_length_pack=conn.recv(4)
        file_info_length=struct.unpack("i",file_info_length_pack)[0]

        # 接收json字符串
        file_info_json=conn.recv(file_info_length).decode("utf8")
        file_info=json.loads(file_info_json)

        action=file_info.get("action")
        filename=file_info.get("filename")
        filesize=file_info.get("filesize")

        # 循环接收文件
        md5=hashlib.md5()
        with open("put/"+filename,"wb") as f:
            recv_data_length=0
            while recv_data_length<filesize:
                data=conn.recv(1024)
                recv_data_length+=len(data)
                f.write(data)
                # MD5摘要
                md5.update(data)
                print("文件总大小：%s,已成功接收%s"%(filesize,recv_data_length))

        print("接收成功！")
        conn.send(b"OK")
        print(md5.hexdigest())
        md5_val=md5.hexdigest()
        client_md5=conn.recv(1024).decode("utf8")
        if md5_val==client_md5:
             conn.send(b"203")
        else:
             conn.send(b"204")

 # ===================================== 客户端 =====================================
import socket
import os
import json
import struct
import hashlib

sock=socket.socket()
sock.connect(("127.0.0.1",8800))


while 1 :
    cmd=input("请输入命令：") # put 111.jpg

    action,filename=cmd.strip().split(" ")
    filesize=os.path.getsize(filename)

    file_info={
        "action": action,
        "filename": filename,
        "filesize": filesize,
    }
    file_info_json=json.dumps(file_info).encode("utf8")

    ret=struct.pack("i",len(file_info_json))
    # 发送 file_info_json的打包长度
    sock.send(ret)
    # 发送 file_info_json字节串
    sock.send(file_info_json)
    # 发送 文件数据
    md5=hashlib.md5()
    with open(filename,"rb") as f:
        for line in f:
            sock.send(line)
            md5.update(line)

    data=sock.recv(1024)
    print(md5.hexdigest())
    md5_val=md5.hexdigest()
    sock.send(md5_val.encode("utf8"))
    is_valid=sock.recv(1024).decode('utf8')
    if is_valid=="203":
        print("文件完整！")
    else:
        print("文件上传失败！")

　　

二. socketserver模块

import socketserver


class Myserver(socketserver.BaseRequestHandler):
    def handle(self):
        # 字节类型
        while 1:
            # 针对window系统
            try:
                print("等待信息")
                data = self.request.recv(1024)  # 阻塞
                # 针对linux
                if len(data) == 0:
                    break
                if data == b'exit':
                    break
                response = data + b'SB'
                self.request.send(response)
            except Exception as e:
                break

        self.request.close()


# 1 创建socket对象 2 self.socket.bind()  3 self.socket.listen(5)
server=socketserver.ForkingUDPServer(("127.0.0.1",8899),Myserver)

server.serve_forever()