上面的代码如何实现双向文件传输呢,举几个例子

实现双向文件传输可以借助 socket 编程中的 send() 和 recv() 函数，以及文件读写操作。以下是两个例子：

1. 客户端向服务器传输文件

客户端代码：

import socket

HOST = '127.0.0.1'
PORT = 8888

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    with open('client_file.txt', 'rb') as f:
        while True:
            data = f.read(1024)
            if not data:
                break
            s.sendall(data)
    print('File sent successfully')

服务器端代码：

import socket

HOST = '127.0.0.1'
PORT = 8888

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.bind((HOST, PORT))
    s.listen()
    conn, addr = s.accept()
    with open('server_file.txt', 'wb') as f:
        while True:
            data = conn.recv(1024)
            if not data:
                break
            f.write(data)
    print('File received successfully')

2. 服务器向客户端传输文件

服务器端代码：

import socket

HOST = '127.0.0.1'
PORT = 8888

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.bind((HOST, PORT))
    s.listen()
    conn, addr = s.accept()
    with open('server_file.txt', 'rb') as f:
        while True:
            data = f.read(1024)
            if not data:
                break
            conn.sendall(data)
    print('File sent successfully')

客户端代码：

import socket

HOST = '127.0.0.1'
PORT = 8888

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    with open('client_file.txt', 'wb') as f:
        while True:
            data = s.recv(1024)
            if not data:
                break
            f.write(data)
    print('File received successfully')

以上两个例子中，客户端和服务器端都可以进行文件的读写操作，从而实现双向文件传输。需要注意的是，文件传输过程中需要将文件按照固定大小进行分割，以便传输和接收。在这里，我们使用了每次读写 1024 字节的方式。