使用TCP实现多用户并发
在前面的实验中,TCP建立连接时,只能允许一个用户连接,当第二个用户建立连接时,发送的信息,服务端是没有办法接受,只有当第一个用户退出时,才能接受到第二个用户的请求,并实现通信
但是UDP可以实现多用户
1 UDP的多并发
服务端
#服务端
import socket #创建对象 socket.SOCK_DGRAM 代表UDP协议
sk = socket.socket(type=socket.SOCK_DGRAM) #在网络中注册该主机
sk.bind ( ("127.0.0.1",9000) ) #udp服务器,第一次启动时,一定是先接收数据,在发送数据
while True:
msg,cli_addr = sk.recvfrom(1024)
print (msg.decode("utf-8"))
print (cli_addr)
#发送消息
message = input("Please input your vaule>>>:")
sk.sendto(message.encode("utf-8"),cli_addr)
#关闭udp连接
sk.close()
客户端
import socket
sk = socket.socket(type=socket.SOCK_DGRAM) #sendto (要发送的消息,(IP地址,端口号))
while True:
message = input("Please input the value:")
sk.sendto (message.encode("utf-8"),("127.0.0.1",9000) )
#接收数据
msg,ser_addr = sk.recvfrom(1024)
print (msg.decode("utf-8"))
#关闭连接
sk.close()
一个client建立连接
[root@node10 tcp]# python3 server.py
Hi,I am the first client
('127.0.0.1', 34937)
Please input your vaule>>>:Hi first client
[root@node10 tcp]# python3 client.py
Please input the value:Hi,I am the first client
Hi first client
再使用一个client连接
三个之间进行通信
服务端
[root@node10 tcp]# python3 server.py
Hi,I am the first client
('127.0.0.1', 44633)
Please input your vaule>>>:Hi first client
Hi
('127.0.0.1', 44633)
Please input your vaule>>>:Hi
Hi,I am the first client2
('127.0.0.1', 56953)
Please input your vaule>>>:Hi,welcome,client 2
thank you
('127.0.0.1', 56953)
Please input your vaule>>>:yes
OK
('127.0.0.1', 44633)
Please input your vaule>>>:ok
第一个clent [root@node10 tcp]# python3 client.py
Please input the value:Hi,I am the first client
Hi first client
Please input the value:Hi
Hi
Please input the value:OK
ok 第二个client
[root@node10 tcp]# python3 client.py
Please input the value:Hi,I am the first client2
Hi,welcome,client 2
Please input the value:thank you
yes
2 调用sockerserver模块
服务端
#服务端
import socketserver
import socket
class MyServer(socketserver.BaseRequestHandler):
def handle(self):
#自定义逻辑
print ("This is tcp funaction") #生成一个对象
server = socketserver.ThreadingTCPServer( ("127.0.0.1",9000),MyServer ) #循环调用
server.serve_forever()
客户端
import socket
sk = socket.socket()
sk.connect( ("127.0.0.1",9000) )
sk.close()
执行
[root@node10 tcp]# python3 server.py
This is tcp funaction
#这里一直阻塞,等待客户端连接
[root@node10 tcp]# python3 client.py
因为客户端没有循环,执行就直接退出,无法看出并发
3 BaseRequestHandle的底层逻辑
服务端
#服务端
import socketserver
import socket
class MyServer(socketserver.BaseRequestHandler):
def handle(self):
#自定义逻辑
print ("This is tcp funaction")
print (self.request)
print (self.client_address) #生成一个对象
server = socketserver.ThreadingTCPServer( ("127.0.0.1",9000),MyServer ) #循环调用
server.serve_forever()
执行
This is tcp funaction
<socket.socket fd=4,
family=AddressFamily.AF_INET,
type=SocketKind.SOCK_STREAM,
proto=0,
laddr=('127.0.0.1', 9000),
raddr=('127.0.0.1', 44428)>
('127.0.0.1', 44428)
4 添加循环不退出
服务端
#服务端
import socketserver
import socket
class MyServer(socketserver.BaseRequestHandler):
def handle(self):
#自定义逻辑
print ("This is tcp funaction")
conn = self.request
while True:
msg = conn.recv(1024)
print(msg.decode("utf8"))
conn.send(b"world")
#生成一个对象
server = socketserver.ThreadingTCPServer( ("127.0.0.1",9000),MyServer ) #循环调用
server.serve_forever()
客户端
import socket
sk = socket.socket()
sk.connect( ("127.0.0.1",9000) )
while True:
# 发消息
sk.send(b"hello") # 接收服务器消息
msg = sk.recv(1024)
print(msg.decode("utf-8"))
sk.close()
执行服务端,然后开启三个客户端
结果如下
多并发已经完成