Similar Java function like atob in javascript

Question

I have Query parameter that was encoded by btoa javascript function. when url clicked, request function called inside java controller where i wanted to decode Query parameter (which is encoded from javascript btoa). i have tried BASE64Decoder and Base64.getDecoder() but not able to get proper value. is there any other way to do so?

Java Controller

@RequestMapping(value = "decode/{email}", method = RequestMethod.GET)
    public String decodeEmail(Model model, @PathVariable String email){
        Decode decode = new Decode();
        decode.setEmail(email);
        decodeService.save(decode);
        return "decode/List";
    }

JavaScript

var email = document.getElementById("email").value;
var encodedEmail = btoa(email);

Example

String to encode : demo@demo.com

Encoded String : ZGVtb0BkZW1vLmNvbQ==

If you could post exact examples of the Javascript Base64 encoding of some sample strings we could confirm correctness. — OldCurmudgeon, Jun 07 '16 at 08:26

OldCurmudgeon · Accepted Answer · 2016-06-07T09:36:22.793

27

Java 8 has a new Base64 package:

public void test() {
    String s = "demo@demo.com";
    String encoded = new String(Base64.getEncoder().encode(s.getBytes()));
    String decoded = new String(Base64.getDecoder().decode(encoded));
    System.out.println("S: " + s + " -> " + encoded + " -> " + decoded);
}

prints

S: demo@demo.com -> ZGVtb0BkZW1vLmNvbQ== -> demo@demo.com

There are also other encoder/decoder pairs - you may find the mime encoder appropriate to your needs.

edited Jun 07 '16 at 09:36

answered Jun 07 '16 at 08:30

OldCurmudgeon

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Why always **new String** is required ? – Cjo Jun 22 '19 at 19:55
@OldCurmudgeon I tried String.valueOf() , it didn't work . Any reason ? – Cjo Jun 26 '19 at 06:48
3

`String encoded = new String(Base64.getEncoder().encode(s.getBytes()));` can be replaced with `String encoded = Base64.getEncoder().encodeToString(s.getBytes());` – Grayson Nov 25 '19 at 14:55

score 0 · Answer 2 · edited May 23 '17 at 11:45

0

The answer for your question is here using apache library : Base64 Encoding in Java

otherwise the implementation from wiki definition will do : https://en.wikipedia.org/wiki/Base64#Sample_Implementation_in_Java

edited May 23 '17 at 11:45

Community

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answered Jun 07 '16 at 08:25

sexybee

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Similar Java function like atob in javascript

2 Answers2