Go language UDP Small notes

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

<pre style= "margin-top:0px; margin-bottom:0px; " ><span style= "color: #0000ff;" >package</span><span style= "color: #f57900;" > </span>main

Import(

  "FMT"

  "NET"

  "Time"

)

FuncMain (){

 udpaddr,err: =net. RESOLVEUDPADDR ("UDP","127.0.0.1:1789")

  iferr!=nil{

 FMT. PRINTLN (ERR)

  return

    }

 lis,err: =net. LISTENUDP ("UDP",udpaddr)

  iferr!=nil{

 FMT. PRINTLN (ERR)

  return

    }

  deferlis. Close ()

  for{

 buf: =make ([]byte,512)

 N,addr,err: =lis. READFROMUDP (BUF)

  iferr!=nil{

 FMT. PRINTLN (ERR)

  Continue

        }

 str: =string(Buf[:n])

  gofunc(Lis*net. Udpconn,addr*net. UDPADDR,bodystring){

 Lis. WRITETOUDP ([]byte(body),addr)

 time. Sleep (3E9)

 } (LIS,addr,str)

    }

}

Package Mainimport ("bytes" "Encoding/json" "FMT" "IO" "NET" "OS") type Fileinfo struct {Name stringpath string}func server ( ) {laddr: = &net. UDPADDR{IP: []byte{127, 0, 0, 1}, Port:1789}con, err: = Net. LISTENUDP ("UDP", laddr) if err! = Nil {fmt. PRINTLN (err) return}defer con. Close () for {Buf: = make ([]byte, 1024x768) n, raddr, _: = Con. READFROMUDP (Buf) var info fileinfojson.unmarshal (Buf[:n], &info) if info. Name! = "" {if info. Path! = "" {e: = os. Chdir (info. Path) If E! = nil {con. WriteTo ([]byte (E.error ()), raddr) Continue}}con. WRITETOUDP ([]byte ("OK"), raddr) File, _: = OS. Create (info. Name) defer file.close () for {Buf: = make ([]byte, 4096) N, r, _: = Con. READFROMUDP (Buf) if r.string ()! = raddr. String () {continue}if n = = 4 && bytes. Contains ([]byte{0, D, D, D}, Buf[:n]) {File.sync () file.close () Break}file.write (Buf[:n])}}}}func client () {con, E: = Net. Dial ("UDP", "127.0.0.1:1789") if E! = nil {fmt. Println (e) Return}defer con. Close () var info Fileinfo = fileinfo{name: "WinMD5.exe", Path: "D:"}b, _: = JSON. Marshal (info) con. Write ([]byte (b)) Buf: = Make ([]byte, 1024x768) n, _: = Con. Read (Buf) if string (buf[:n] = = "OK" {File, _: = OS. Open ("3.go") for {Buf: = make ([]byte, 4096) n, E: = File.read (BUF) if E! = Nil {if E = = io. EOF {break}fmt. Println (e) Break}con. Write (Buf[:n])}con. Write ([]byte{0, 69, 79, 70}}}