今日主题：在 Python TCP 协议网络编程《二》的基础上增加了当服务器重启后客户端不挂掉，客户端能够重试连接服务端的功能。

代码实现如下：

server.py文件内容如下

 1from socket import socket,SOCK_STREAM,AF_INET #导入模块  2  3def tcp_server():  4    tcp_server_socket=socket(AF_INET,SOCK_STREAM) #创建TCP服务端套接字对接，UDP是SOCK_DGRAM  5    server_address=('127.0.0.1',9999)#定义本TCP服务端的ip and port  6    tcp_server_socket.bind(server_address) #绑定本机的9999端口  7    tcp_server_socket.listen() #执行监听  8    client_socket,client_info = tcp_server_socket.accept() #接收客户端的socker and info  9    while 1: 10        data=client_socket.recv(1024)#接收客户端发过来的消息 11        datas=data.decode("utf-8") 12        if(len(datas)>1): 13            print("the client say:",datas)#打印客户端发送过来的信息 14            if(datas=="bye"): 15                break 16            server_answer=input('>>>')#从键盘录入信息 17            client_socket.send(server_answer.encode("utf-8")) 18 19if __name__ == '__main__': 20    print("the TCP server is running ...") 21    tcp_server()

client.py文件内容如下

 1import time  2  3from socket import socket,SOCK_STREAM,AF_INET #导入模块  4  5  6def connection_socket():  7    tcp_client_socket = socket(AF_INET, SOCK_STREAM)  # 创建TCP客户端套接字对接  8    server_address = ('127.0.0.1', 9999)  # 定义本TCP服务端的ip and port  9    try: 10        tcp_client_socket.connect(server_address)  # 连接到服务端 11    except: 12        print("connection failed!!!") 13        exit(0) 14    return tcp_client_socket 15 16def tcp_client(): 17    while 1: 18        try: 19            tcp_client_socket=connection_socket() 20            message=input("client>>>") #定义要发送的消息 21            print("the message is:",message) 22            print(tcp_client_socket) 23            tcp_client_socket.send(message.encode("utf-8"))#向服务端发送消息 24            response=tcp_client_socket.recv(1024) 25            print("the server say:",response.decode("utf-8")) 26        except: 27            tcp_client_socket.close()#关闭原有socket连接 28            print("the socket connection is failed, try again to reconnection...") 29            time.sleep(3) 30 31if __name__ == '__main__': 32    print("the TCP client is running ...") 33    tcp_client() 34    print("the message was send")

client console output:

 1the TCP client is running ...  2  3client>>>abc  4the message is: abc  5<socket.socket fd=200, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 55699), raddr=('127.0.0.1', 9999)>  6the server say: def  7  8client>>>aa  9the message is: aa 10<socket.socket fd=1888, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 55700), raddr=('127.0.0.1', 9999)> 11the socket connection is failed, try again to reconnection... 12 13client>>>abc 14the message is: abc 15<socket.socket fd=1888, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 55703), raddr=('127.0.0.1', 9999)> 16the server say: def 17client>>>