The go language implements directed chat, the simplest.

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

The code does not comment, because I take this as a note to do, if interested in the go language, add me QQ we learn the new language together.

Service side: Message_server.go

Package Mainimport ("Container/list" "Encoding/json" "FMT" JSON "Go-json"//go-simplejson "net" "Sync" "Time") type Client _message struct {sender intreceiver intmethod stringbody string}type all_message struct {List *list. Listlock sync. Mutex}type Message struct {time Int64sender intmes string}var ip_port string = ": 5555" var message_map map[int]all_mes Sage = Make (Map[int]all_message) func main () {Con, _: = Net. Listen ("TCP", Ip_port) defer con.close () for {Con, _: = Con.accept () fmt. Println (time. Now (). Local (), ":", con. REMOTEADDR ()) go Connection (con)}}func Connection (Con net. Conn) {defer con. Close () for {Buf: = make ([]byte, 2048) n, e: = con. Read (BUF) if E! = Nil {break}if N = = 0 {continue}mes, err: = Json.newjson (Buf[:n]) if err! = nil {con. Write ([]byte ("NOT_OK")) continue} else {con. Write ([]byte ("OK"))}c_message: = Convert_json (Mes) Switch {case C_message.method = = "Put":P ut_message (c_message) Case C _message.method = = "Get": Buf: = make ([]byte, 2048) List: = Get_message (C_message.receiver) if List = = Nil {con. Write ([]byte ("0")) Continue}num: = Len (list) con. Write ([]byte (FMT. Sprint (Num))) n, E: = con. Read (BUF) checkerror ("Get", E) if string (buf[:n]) = = "Get_len_ok" {for _, V: = Range list {n, e: = con. Write (v) n, E = con. Read (BUF) checkerror ("Get_for", E) if string (buf[:n]) = = "Get_ok" {continue} else {Break}}}}}}func put_message (c_message Client_message) {var String message = Message{time. Now (). Unix (), C_message.sender, C_message.body}if Message_map[c_message.receiver]. List = = Nil {Message_map[c_message.receiver] = all_message{list:list. New ()}}m: = Message_map[c_message.receiver]m.lock.lock () m.list.pushfront (String) m.lock.unlock ()}func Get_message ( Num int) [][]byte {var message_list [][]byteif Message_map[num]. List = = Nil {return Nil}l: = Message_map[num]l.lock.lock () x: = L.list.len () for I: = 0; i < x; i++ {Date, _: = json. Marshal (L.list.remove (L.list.back ())) Message_list = append (message_list, Date)}l.lock.unlock () return message_list} Func checkerror (POS string, e error) {if E ! = Nil {fmt. Println (POS, ":", E)}}func Convert_json (Mes *json.json) client_message {var m client_messagemethod, _: = Mes.get ("method "). String () sender, _: = Mes.get ("sender"). INT () receiver, _: = Mes.get ("receiver"). Int () body, _: = Mes.get ("Body"). String () m = Client_message{sender, receiver, method, Body}return m}

Client: Send_message.go

Client I was divided into two small parts, one is specifically automatically received, one is the use of the message, I would like to do the two colleagues, but not under the GUI input output I do not know how to solve, so there is a two-part.

Package Mainimport (//"Encoding/json" "FMT" JSON "Go-json" "Net" "StrConv" T "time") type client_message struct {sender Intreceiver intmethod stringbody string}type Message struct {time int64sender intmes string}var Sender int = 12 3456789var receiver int = 1597805565//qqfunc main () {con, err: = Net. Dial ("TCP", "127.0.0.1:5555") defer con. Close () if err! = Nil {fmt. PRINTLN (ERR)}/* This logoff part is used to send messages, compile the time to write off a for loop. for {var Str stringfmt. Scan (&AMP;STR) if x: = Send_message (con, Str); String (x) = = "OK" {fmt. PRINTLN ("message sent successfully")}}*/for {//This for loop is used to receive messages and cannot be compiled with the previous one. If e: = Get_message (con); E! = nil {break}t.sleep (3e9)}}func S End_message (Con net. Conn, Str string) []byte {mes: = []byte (FMT. Sprintf (' {' sender ':%d, ' receiver ':%d, ' method ': '%s ', ' body ': '%s '} ', sender, receiver, ' put ', Str)) if 0 < Len (MES) && len (MES) <= 2048 {Buf: = make ([]byte, 2048) con. Write (MES) n, _: = Con. Read (BUF) return Buf[:n]} else {fmt. PRINTLN ("cannot be empty or send text beyond the Limit") return nil}}func get_message (Con net. Conn)Error {var Buf []byte = make ([]byte, 2048) mes: = []byte (FMT. Sprintf (' {' sender ':%d, ' receiver ':%d, ' method ': '%s ', ' body ': '%s '} ', sender, receiver, ' get ', ' ') ') _, E: = con. Write (MES) if E! = nil {fmt. PRINTLN ("Message acquisition failed") return E}s: = String (Checkresponse (con)) if s = = "OK" {Num, _: = StrConv. Atoi (String (Checkresponse (con))) if Num > 0 {con. Write ([]byte ("GET_LEN_OK")) for I: = 0; i < Num; i++ {N, _: = Con. Read (Buf) Result, _: = json. Newjson (Buf[:n]) sender, _: = Result.get ("sender"). Int () time, _: = Result.get ("Time"). Int64 () body, _: = Result.get ("Mes"). String () fmt. Println ("sender:", sender) Fmt. PRINTLN ("Send Time:", T.unix (times, 0). Format ("2006-01-02 03:04:05 PM"), "content:", body) con. Write ([]byte ("GET_OK"))}}}return nil}func checkresponse (Con net. Conn) []byte {Buf: = make ([]byte, 1024x768) n, e: = con. Read (BUF) if E! = nil {fmt. Println (e)}return Buf[:n]}

Client:

Service side: