go监听随机端口

func Start_Random() (int, error) {

    //监听随机端口

    l, err := net.Listen("tcp", "0.0.0.0:0")

    if err != nil {

        beego.Error("CAN'T LISTEN: ", err)

        return 0, err

    }

    port := l.Addr().(*net.TCPAddr).Port

    beego.Debug("Listen On Port:", port)

    go func() {

        for {

            conn, err := l.Accept() //循环接受客户端和设备的连接请求

            if err != nil {

                beego.Error("Can't Accept: ", err)

                return

            }

            go onRandomConnect(conn, l) //

        }

    }()

    return port, nil

}