Go -- socket read的內容以16進制輸出

buf := make([]byte, 1024)

reqLen, err :=  conn.Read(buf)
// 遍歷, 轉為16進制
    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)
    }
    // 轉化為字符串
    fmt.Println(buffer.String())