String to hex bytes String in Scala.

HexStringUtil.scala

object HexStringUtil {
    
    // convert normal string to hex bytes string
    def string2hex(str: String): String = {
        str.toList.map(_.toInt.toHexString).mkString
    }
    
    // convert hex bytes string to normal string
    def hex2string(hex: String): String = {
        hex.sliding(2, 2).toArray.map(Integer.parseInt(_, 16).toChar).mkString
    }
    
    def demo {
        val appkey = "9GLV//lv/kYFW2o3/bihxwnMcmo="
        
        // string to hex
        val appkey_hex = string2hex(appkey)
        // 39474c562f2f6c762f6b594657326f332f62696878776e4d636d6f3d
        println(appkey_hex)
        
        // hex to string
        val appkey_string_again = hex2string(appkey_hex)
        // 9GLV//lv/kYFW2o3/bihxwnMcmo=
        println(appkey_string_again)
    }
    
}

没有显示结果是0x1c、0x02等等这种形式的嘛

Is this valid? Don't .toHexString strips leading zeroes?

This seems to pass tests in ScalaCheck much better...

 def stringToHex(input: String): String = {
    input.getBytes(java.nio.charset.StandardCharsets.UTF_8)
      .map("%02x".format(_))
      .mkString
  }

  def hexToString(hex: String): String = {
    val byteArray = hex.sliding(2, 2).toArray.map(hexPair => Integer.parseInt(hexPair, 16).toByte)
    new String(byteArray, java.nio.charset.StandardCharsets.UTF_8)
  }