buf := make([]byte, 1024)reqLen, err :=  conn.Read(buf)// 遍历, 转为16进制    buffer := new(bytes.Buffer)    for _, b := range buf[:reqLen] {        s := strconv.FormatInt(int64(b&0xff), 16)        if len(s) == 1 {            buffer.WriteString("0")        }        buffer.WriteString(s)    }    // 转化为字符串    fmt.Println(buffer.String())