learning python network programming

You may be familiar with url-based HTTP requests and other operations using the urllib2 module. here, we will take a closer look at urllib2's HTTP exception handling functions, let's take a look at the usage summary of the urllib2 module in Python network programming: I. basic applications import urllib2url = r'http://www.baidu.com'html = urllib2.urlopen(url).r

connected: ', self.client_address) self.wfile.write ((' [%s]%s '% (CTime (), self.rfile.readline (). Decode ("UTF-8")). Encode ("UTF-8") )) Tcpserv = Server (ADDR, Myrequesthandler) #变动位置 Print (' Wait for a new connection .... ') Tcpserv.serve_forever () Multithreadingsocketserver Server:[Python]View PlainCopy From Socketserver import (TCPServer as TCP, Streamrequesthandler as srh,threadingmixin as TMI) #变动位置 From time import CT

Python: tcp and udp network programming example of SocketServer Example of a tcp network program written using the SocketServer module (socketserver in python3: #! /Usr/bin/env python # Server From SocketServer import TCPServer as TCP, StreamRequestHandler as SRH Class MyRe

client{public static void Main (string[] args) throws Exception {Socket socket = new socket ("localhost", 9999);Sending information to the serverOutputStream OS = Socket.getoutputstream ();PrintStream PS = new PrintStream (OS);PS.PRINTLN ("Client-side services");Read the information sent by the serverInputStream is = Socket.getinputstream ();BufferedReader br = new BufferedReader (new InputStreamReader (IS));String str = br.readline ();System.out.println (str);Br.close ();Is.close ();Socket.clo

connected, Then go to the socket in the listen state to find */return SK? : __inet_lookup_listener (NET, Hashinfo, daddr, Hnum, dif);} Summarize the process: Server side After calling listen, the kernel establishes two queues, the SYN queue, and the accept queue, where the length of the accept queue is specified by the backlog. After the server has called accept, it blocks, waits for an element of the accept queue, and after the client calls connect, it begins to initiate a SYN request and req

: (Nsxmlparser *) parser{NSLog (@ "parserdidstartdocument ...");} Read document end-(void) Parserdidenddocument: (Nsxmlparser *) parser{NSLog (@ "parserdidenddocument ...."); Read element start-(void) Parser: (Nsxmlparser *) parser didstartelement: (NSString *) elementname NamespaceURI: (NSString *) NamespaceurI qualifiedname: (NSString *) QName attributes: (nsdictionary *) attributedict{NSLog (@ "didstartelement ..."); Self.currrentelement = elementname; if ([Self.currrentelement isequalt

..."); Socket.receive (packet); System.out.println ("Just from" + packet.getsocketaddress () + "receive package"); Buffer = Packet.getdata (); System.out.println ("New String (buffer)"); catch (IOException e) { e.printstacktrace ();}} }Send Message Packet1. Create a byte array that is large enough to store the packet data to be sent and populate the array with that data;2. Create a new Data

This article mainly introduces common python network programming code segments. For more information, see the following server code: #-*-Coding: cp936-*-import socket sock = socket. socket (socket. AF_INET, socket. SOCK_STREAM) # Initialize socket sock. bind ("127.0.0.1", 8001) # bind the local address, Port 8001 sock. listen (5) # wait for the client to conne

' Marks: '%d ' '% SE Lf.markst = Teacher (' Mrs. ShriVidya ', Max, 30000) s = Student (' Swaroop ', ', ') Print # prints a blank linemembers = [T, s]for member in Members:membe R.tell () # Works for both Teachers and Students$ python inherit.py(Initialized SchoolMember: Mrs. Shrividya)(Initialized Teacher: Mrs. Shrividya)(Initialized SchoolMember: Swaroop)(Initialized Student: Swaroop)Name:"Mrs. Shrividya" Age:"40" Salary: "30000"Name:"Swaroop" Age:"

data before the next one can be sent. */PID = fork ();if(PID = =0) Write_routine (sock, buf);ElseRead_routime (sock, buf); Close (sock);return 0;}voidError_handling (Char*message) {fputs(message, stderr); FPUTC (' \ n ', stderr);Exit(1);}voidRead_routime (intSockChar*BUF) { while(1) {intStr_len = Read (sock, buf, buf_size);if(Str_len = =0)return; Buf[str_len] =0;printf("Message from server:%s", buf); }}voidWrite_routine (intSockChar*BUF) { while(1) {fgets (buf, Buf_size, stdin);if(!strcmp(BUF,"

stream. Out.write ("TCP demo, buddy!". GetBytes ()); S.close (); }}--------------------------------------------------------------TCP Service side:1, create the service-side socket service and listen to a port. 2, the server in order to provide services to the client, get the contents of the client, you can get the client object connected through the Accept method. 3, you can communicate by getting the socket stream in the socket object and the specific client. 4, if the communication is over

Interaction of two hosts on the network① find the other host based on IP② data is sent to the application specified by the other party, in order to represent these applications, the concept of port is introduced.Common ports:Wed Port 80MySQL Port 3306Valid Port 0~65535③ defines a communication rule, called a protocol. International organizations define the common protocol TCP/IP protocolLocal loopback address: 127.0.0.1 (IP address If this machine doe

descriptors, and the Select () function can return as long as there is a ready.The use of multiplexing technologies is: When a client needs to handle input and output operations for multiple file descriptors at the same time (generally standard input and output and network sockets), I/O multiplexing technology will have the opportunity to be used When a program needs to do multiple sockets at the same time If a TCP server program han

Basic Programming of network security in python C/S Mode1. socket programming Socket types include: -- TCP socket and UDP socket.Regular customer service mode. -- Raw socketUsed for sniffing and injection 2. C/S Mode The C/S (Client/Server, Client/Server) mode, also known as the C/S structure, is a model that gradually

This article mainly introduces the example of using the original socket for network programming in Python. using sock_raw to accept and send packets can avoid many restrictions on the network protocol, you can refer to the experiment where you need to construct a separate HTTP data packet, and use SOCK_STREAM to send d

Python-socket principle in network programming, pythonsocket Python is a powerful network programming tool. We start from the socket module here. Methods for handling multiple connections: forking, threading, asynchronous I/OF

Python network programming (i).Function: The client sends a picture to the server.Server code:1 #!/user/bin/env python2 #-*-coding:utf-8-*-3 ImportSocket4SK =Socket.socket ()5Sk.bind (('127.0.0.1', 8080, ))6Sk.listen (5)7 whileTrue:8Conn, address =sk.accept ()9Conn.sendall (Bytes ('Welcome to login ftp!', encoding='Utf-8'))TenFile_size = CONN.RECV (1024). Decode

This article mainly introduces Python in the use of raw sockets for network programming examples, the use of Sock_raw to accept and send packets can avoid the limitations of the network protocol, the need for friends can refer to the In the experiment, we need to construct a separate HTTP data message, and use Sock_st

Python: tcp network programming The c/s architecture of the tcp protocol written by the python socket module network program structure: #! /Usr/bin/env python# Server From socket import *Ss = socket (AF_INET, SOCK_STREAM)Ss

%s"%e}cur = conn.cursor (cursor=pymysql.cursors.dictcursor)#建立游标TryIs_correct_sql (SQL)Cur.execute (SQL)Except Exception as E:return {"Code": 309, "MSG": "SQL Error! %s "%e}ElseIf Sql.startswith (' select '): # Determine what the statement isres = Cur.fetchone ()ElseConn.commit ()res = 88return resFinallyCur.close ()Conn.close ()#执行sqldef is_float (s):TryFloat (s)Except Exception as E:Return FalseReturn TrueClass Sqlerr (Exception):def __str__ (self):Return ' SQL Exception hahahhahahfdsfsdflkj4k