python网络编程-socket样例

socket样例

一：只能一个客户端发送一个信息。

客户端
# -*- coding:utf-8 -*-
__author__ = 'shisanjun'

import socket

sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)#声明socket对象

sock.connect(("127.0.0.1",9696))#链接服务器端

sock.send("中国我爱你aaaabbbb".encode("utf-8")) #给服务器端发送消息，发送数据只能是byte类型

data1=sock.recv(4096)#接受服务器端发过来的数据

print(data1.decode("utf-8"))
print("")
sock.close()

服务端
# -*- coding:utf-8 -*-
__author__ = 'shisanjun'

import socket

sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.bind(("127.0.0.1",9696)) #绑定ip和端口
sock.listen(5)  #监听
print("接受前")
conn,addr=sock.accept() #阻塞等客服端消息

print("接受后")
data = conn.recv(4096)

“”“

recv 官方建议最大8192 ,默认是阻塞的，客服端没有数据就是阻塞，如果客户 
断开，conn,recv收到就是都是空数据，就会进入死循环,解决
if not data:
break

”“”

print(data.decode("utf-8")) conn.send(data.upper()) sock.close()

二：只能一个客户端发送N多消息

客户端
# -*- coding:utf-8 -*-
__author__ = 'shisanjun'

import socket

sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)

sock.connect(("127.0.0.1",9696))
while True:
    say=input("请输入文字>>")
    sock.send(say.encode("utf-8"))

    data1=sock.recv(4096)

    print(data1.decode("utf-8"))
    if say=='b':
        break
sock.close()

服务器端
# -*- coding:utf-8 -*-
__author__ = 'shisanjun'

import socket

sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.bind(("127.0.0.1",9696))
sock.listen(5)
print("接受前")
while True:
    conn,addr=sock.accept()
    while True:
        print("接受后")
        data = conn.recv(4096)
        print(data.decode("utf-8"))
        conn.send(data.upper())

sock.close()

三：多个客户端发送多个消息（实现文件上传功能）

客户端
# -*- coding:utf-8 -*-
__author__ = 'shisanjun'

import socket
import json
import os
host=("127.0.0.1",9000)
client=socket.socket()

client.connect(host)

while True:
    cmd_str=input("请输入命令>>").strip()
    if len(cmd_str)==0:continue
    cmd_list=cmd_str.split()

    if cmd_list[0]=="put":
        if len(cmd_list)==1:
            print("not find put filename")
        else:
            filename=cmd_list[1]
            if os.path.isfile(filename):
                file_obj=open(filename,'rb')
                filename2=filename.split("/")[-1]
                print(filename2)
                data_stat="%s %s" %(filename2,os.path.getsize(filename))
                data={
                    "filename":filename2,
                    "filesize":os.path.getsize(filename)
                }
                client.send(json.dumps(data).encode("utf-8"))
                for line in file_obj:
                    client.send(line)
                file_obj.close()
            else:
                print("can not find file")
    elif cmd_list[0]=="get":
        pass

服务器端
# -*- coding:utf-8 -*-
__author__ = 'shisanjun'

import socket
import json
host=("127.0.0.1",9000)
server=socket.socket()

server.bind(host)
server.listen(5)

while True:
    conn,addr=server.accept()

    data=conn.recv(4096)
    print(data.decode("utf-8"))
    data_dict=json.loads(data.decode("utf-8"))
    filename=data_dict.get("filename")
    f=open(filename,"wb")
    recesize=0
    while recesize<data_dict.get("filesize"):
        recefile=conn.recv(4096)
        f.write(recefile)
        recesize+=len(recefile)
    f.close()