[日常] Go语言圣经--并发的循环习题

import (
"bufio"
"fmt"
"log"
"net"
"Strings"
"time"
"sync"
)

func main() {
listener,err := net.Listen("tcp",":8040")
if err != nil {
log.Fatal(err)
}

    for {
            conn,err := listener.Accept()
            if err != nil {
                    log.Print(err) // e.g.,connection aborted
                    conTinue
            }   
            go handleConn(conn) //新建goroutInes处理连接
    }   

}

func handleConn(c net.Conn) {
input := bufio.NewScAnner(C)
var wg sync.WaitGroup
//var ch =make(chan struct{})
for input.Scan() {
wg.Add(1)
go func(c net.Conn,shout String,delay time.Duration) {
defer wg.Done()
fmt.Fprintln(c,"\t",Strings.ToUpper(shout))
time.Sleep(delay)
fmt.Fprintln(c,shout)
time.Sleep(delay)
fmt.Fprintln(c,Strings.ToLower(shout))
//ch<-struct{}{}

            }(c,input.Text(),1*time.Second)
    }   
    wg.Wait()
            //cw := c.(*net.TCPConn)
      //cw.CloseWrite()

    c.Close()

}