Hex-encoded String to Byte Array

Question

String str    9B7D2C34A366BF890C730641E6CECF6F     I want to convert str into byte array  but str getBytes   returns 32 bytes instead of 16

User · Answer

try this        String str    9B7D2C34A366BF890C730641E6CECF6F        String   temp   str split            bytesArray   new byte temp length        int index   0       for  String item  temp         bytesArray index    Byte parseByte item        index

User · Answer

I think what the questioner is after is converting the string representation of a hexadecimal value to a byte array representing that hexadecimal value   The apache commons-codec has a class for that  Hex   String s    9B7D2C34A366BF890C730641E6CECF6F       byte   bytes   Hex decodeHex s toCharArray

User · Answer

Use   str getBytes  UTF-16LE

User · Answer

I assume what you need is to convert a hex string into a byte array that equals that means the same thing as that hex string  Adding this method should do it for you  without any extra library importing   public static byte   hexToByteArray String s         String   strBytes   s split     lt    G  2           byte   bytes   new byte strBytes length        for int i   0  i  lt  strBytes length  i             bytes i     byte Integer parseInt strBytes i   16        return bytes

User · Answer

I know it s late but hope it will help someone else     This is my code  It takes two by two hex representations contained in String and add those into byte array  It works perfectly for me   public byte   stringToByteArray  String s        byte   byteArray   new byte s length   2       String   strBytes   new String s length   2       int k   0      for  int i   0  i  lt  s length    i i 2            int j   i 2          strBytes k    s substring i j           byteArray k     byte Integer parseInt strBytes k   16           k              return byteArray

User · Answer

That should do the trick    byte   bytes   toByteArray Str toCharArray      public static byte   toByteArray char   array        return toByteArray array  Charset defaultCharset        public static byte   toByteArray char   array  Charset charset        CharBuffer cbuf   CharBuffer wrap array       ByteBuffer bbuf   charset encode cbuf       return bbuf array

User · Answer

Java SE 6 or Java EE 5 provides a method to do this now so there is no need for extra libraries   The method is DatatypeConverter parseHexBinary  In this case it can be used as follows   String str    9B7D2C34A366BF890C730641E6CECF6F   byte   bytes   DatatypeConverter parseHexBinary str     The class also provides type conversions for many other formats that are generally used in XML

[java] Hex-encoded String to Byte Array

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