# 客户端
import socket 
obj = socket.socket()
obj.connect(('127.0.0.1', 9999))
# 最多接收1024字节
res_bytes = obj.recv(1024)
res_str = str(res_bytes, encoding='utf-8')
print(res_str)
while True:
     inp = input("请输入你想要发送的内容：")
     if inp == "q":
         obj.sendall(bytes(inp, encoding='utf-8'))
         break
     else:
          obj.sendall(bytes(inp, encoding='utf-8'))
          ret = str(obj.recv(1024), encoding='utf-8')
          print(ret)

obj.close()
#======================================================
# 服务端
import socket 

sk = socket.socket()
sk.bind(('127.0.0.1', 9999, ))
sk.listen(5)

while True:
    # 接收客户端的请求 accept是阻塞的
    conn, address = sk.accept()
    conn.sendall(bytes('欢迎致电中国移动', encoding='utf-8'))
    while True:
        ret_bytes = conn.recv(1024)
        ret_str = str(ret_bytes, encoding='utf-8')
        if ret_str == 'q':
            break
        conn.sendall(bytes(ret_str + "好的", encoding='utf-8'))

# client.py 客户端
import socket
import os

obj = socket.socket()
obj.connect(('127.0.0.1', 9999, ))

# 阻塞，最多接收1024字节
res_bytes = obj.recv(1024)
res_str = str(res_bytes, encoding='utf-8')
print(res_str)

# 发送当前文件大小
# size = os.stat('f.png').st_size()
size = os.path.getsize('f.png')

obj.sendall(bytes(str(size), encoding='utf-8'))

# 接收反馈，解决粘包问题
obj.recv(1024)

with open('f.png', 'rb') as f:
    for line in f:
        obj.sendall(line)

obj.close()
# =====================================================
# server.py 服务端
import socket

sk = socket.socket()
sk.bind(('127.0.0.1', 9999, ))
sk.listen(5)

while True:
    # 接收客户端的请求 accept是阻塞的
    conn, address = sk.accept()
    conn.sendall(bytes("欢迎登录xxx平台FTP", encoding='utf-8'))

    # 先接收文件大小，再开始接收文件
    file_size = str(conn.recv(1024), encoding='utf-8')
    # 反馈一下
    conn.sendall(bytes("收到文件大小", encoding='utf-8'))
    total_size = int(file_size)
    has_recv = 0

    f = open('new.png', 'wb')
    # 接收文件内容，直到获取完毕
    while True:
        if total_size == has_recv:
            break
        data = conn.recv(1024)
        f.write(data)
        has_recv += len(data)

    f.close()

# 处理多并发服务端
import socketserver

# 自定义类，必须继承socketserver.BaseRequestHandler
class MyServer(socketserver.BaseRequestHandler):

    # 实现handle方法
    def handle(self):
        # self.request, self.client_address, self.server
        conn = self.request
        conn.sendall(bytes('欢迎致电中国移动', encoding='utf-8'))
        while True:
            ret_bytes = conn.recv(1024)
            ret_str = str(ret_bytes, encoding='utf-8')
            if ret_str == 'q':
                break
            conn.sendall(bytes(ret_str + '好的', encoding='utf-8'))

if __name__ == '__main__':
    server = socketserver.ThreadingTCPServer(('127.0.0.1', 9999), MyServer)
    server.serve_forever()