Golang NET Package Simulation

This is a creation in Article, where the information may have evolved or changed.

Let's make some fun to simulation server-client.

1. Socket

I implement a ECHO server and use Telnet to simulate the socket client.

In the This, we don't need to implement our sockets client but can test our client server in a standard-to-do.

It can support multiple Telnet clients concurrently. The behavior is as bellow.

When user input ' BYE ', the Connect to server shuts down.

Code snippet:

1 Package Main2 3 Import (4     "Bufio"5     "FMT"6     "io"7     "Log"8     "Net"9     "Strings"Ten ) One  A Func Main () { -     //Listen on TCP Port # on all interfaces. -L, Err: = Net. Listen ("TCP",":") the     ifErr! =Nil { - log. Fatal (ERR) -     } - defer l.close () +  -      for { +         //Wait for a connection. AConn, Err: =l.accept () at         ifErr! =Nil { - log. Fatal (ERR) -         } -Fmt. Println ("info:accept a client") -  -         //Handle the connection in a new goroutine. in go func (c net. Conn) { - defer c.close () to  +RD: =Bufio. Newreader (c) -              for { theLine, _, Err: =Rd. ReadLine () *                 ifErr! = Nil && Err! =io. EOF { $ log. Fatal (ERR)Panax Notoginseng                 } -  theS: =string(line) +Fmt. Println ("LOG:", s) A  the                 //since Rd. ReadLine () had trimed last "\ n", append here to echo +_, Err = conn. Write ([]byte("ECHO:"+ S +"\ r \ n")) -                 ifErr! =Nil { $ log. Fatal (ERR) $                 } -  -                 ifStrings. ToLower (s) = ="Bye" { theFmt. Println ("Info:client closed") -                      BreakWuyi                 } the             } - } (conn) Wu     } -}

2. http. Client