Convert Base64 String to Byte Value String in Java

Question

I have a Base64 String, which is 'AAAC', which in binary is equivalent to 3 bytes (00000000 00000000 00000010).

I would like to convert 'AAAC' to a ASCII Hex Byte String to output something like '000002'.

I have tried below.

byte[] test = Base64.decode(data.getBytes());
StringBuilder sb = new StringBuilder();
for (byte b : test) {
    sb.append(String.format("%02X ", b));
}
System.out.println(sb.toString()); 
//Output: 00 00 02

This works, but is there a more effient way to do this?

Any help would be appreciated. Thanks in advance.

Duncan Jones · Accepted Answer · 2014-10-27 13:36:39Z

2

You could use the DatatypeConverter class for this:

String result =
    DatatypeConverter.printHexBinary(DatatypeConverter
        .parseBase64Binary("AAAC"));

System.out.println(result);

Prints: 000002

answered Oct 27, 2014 at 13:36

Duncan Jones

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Comments

Louis Wasserman · Accepted Answer · 2014-10-27 16:25:27Z

1

With the Guava library, this might look something like

BaseEncoding.base16().toUpperCase().withSeparator(" ", 2)
  .encode(BaseEncoding.base64().decode(data));

answered Oct 27, 2014 at 16:25

Louis Wasserman

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