Golang Implement a chat room

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

Recently took a look at the go language, tried to write a chat room, practice practiced hand just, but for me to do PHP, the go language is very enlightening to me.

Customer Service side

Package Mainimport ("FMT" "NET" "OS")//define channel var ch chan int = make (chan int)//define nickname Var nickname Stringfunc Reader ( Conn *net. Tcpconn) {buff: = make ([]byte, +) for {j, err: = conn. Read (Buff) if err! = Nil {ch <-1 break} fmt. Println (String (Buff[0:j]))}}func main () {tcpaddr, _: = Net. RESOLVETCPADDR ("TCP", "127.0.0.1:9999") conn, err: = Net. DIALTCP ("TCP", nil, tcpaddr) if err! = Nil {fmt. Println ("Server is not starting") OS. Exit (0)}//Why can't I put it before the IF? Err is not nil words is painc (PAINC and defer discrimination!!! ) Defer Conn. Close () Go Reader (conn) fmt. Println ("Please enter nickname") fmt. Scanln (&nickname) fmt. Println ("Your nickname is:", nickname) for {var msg string fmt. Scanln (&msg) B: = []byte ("<" + nickname + ">" + "said:" + MSG) Conn. Write (b)//select is a non-blocking select {case <-ch:fmt.            PRINTLN ("Server Error! Please reconnect!") Os. Exit (1) dEfault://Do not add default, then <-ch will block for, the next input will not be the method}} 

server-side

Package Mainimport ("FMT" "net") var connmap map[string]*net. Tcpconnfunc Checkerr (err error) int {if err! = Nil {if Err. Error () = = "EOF" {//user exits FMT. PRINTLN ("user launched") return 0} fmt. PRINTLN ("Error") Return-1} return 1}func say (Tcpconn *net.        Tcpconn) {for {//read a client sent over data: = Make ([]byte, +) Total, err: = Tcpconn.read (data) Fmt.         Println (String (data[:total), err) flag: = Checkerr (err) if flag = = 0 {//exit entire loop break }//Broadcast form, send data to each client for _, Conn: = Range Connmap {if Conn. Remoteaddr (). String () = = Tcpconn.remoteaddr (). String () {///does not send a message to the data input client continue} conn. Write (Data[:total])}}}func Main () {tcpaddr, _: = Net. RESOLVETCPADDR ("TCP", "127.0.0.1:9999") TcpListener, _: = Net. LISTENTCP ("TCP", TCPADDR)/* map is defined and make? (Which data types defineAfter you finish, make?) Http://stackoverflow.com/questions/27267900/runtime-error-assignment-to-entry-in-nil-map */Connmap = make (map[ String]*net. Tcpconn) for {tcpconn, _: = Tcplistener.accepttcp () defer tcpconn.close () Connmap[tcpconn.remotea DDR (). String ()] = Tcpconn FMT. Println ("Connected Customer terminal information:", TCPCONN.REMOTEADDR (). String ()) go Say (tcpconn)}}