go socket 服务端处理多用户

package mainimport (   "fmt"   "net"   "strings")func main() {   listener, err := net.Listen("tcp", "127.0.0.1:8000")   if err != nil {      fmt.Println(err.Error())      return   }   defer listener.Close()   //接收多个用户   for {      conn, err := listener.Accept()      if err != nil {         fmt.Println(err.Error())         return        }       //处理用户的连接       go handleConn(conn)      }} func handleConn(conn net.Conn){   defer conn.Close()    buff := make([]byte, 1024)   for {      n, err := conn.Read(buff)      if err != nil {         fmt.Println(err)         return      }      content := string(buff[:n])      fmt.Println("content=", string(buff[:n]))      content = strings.ToUpper(content)      conn.Write([]byte(content))   } }