Base64 Conversion

Question

I have a string that is encoded as base64 by using the Convert.ToBase64String() in C#. I want to decode the same string in Java. How is it possible? I am using:

decodedString = Base64.getMimeDecoder().decode(data);

And it shows this error:

Exception in thread "Thread-6" java.lang.IllegalArgumentException: Input byte

Methods for decoding base64 in Java are well-documented. If you are having trouble getting one or more of those methods to work, and you would like help from the Stack Overflow community, make sure that your question includes a good [mcve] that reliably reproduces your problem. See also [ask], including articles linked at the bottom of that page, for more advice about how to present your question in a clear, answerable way. — Peter Duniho, Jun 14 '17 at 06:15

Rahul Hendawe · Answer 1 · 2017-06-14T05:57:29.300

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You can do it like below

byte [] valueDecoded = Base64.decodeBase64(data);
System.out.println("Decoded value is " + new String(valueDecoded));

edited Jun 14 '17 at 05:57

answered Jun 14 '17 at 05:41

Rahul Hendawe

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But it showing compile error ,its undefine function – Muhammed Yaseen Jun 14 '17 at 05:45
May be you have not added Class Base64 reference reference in your project, you can check the docs [here](https://docs.oracle.com/javase/8/docs/api/java/util/Base64.html) – Rahul Hendawe Jun 14 '17 at 05:48

Michael Markidis · Answer 2 · 2017-06-14T05:56:41.030

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You can decode it by doing the following:

// just an example (put your string here)
String encodedStr = "aGVsbG8gd29ybGQ=";

byte [] valueDecoded = java.util.Base64.getDecoder().decode(encodedStr);
System.out.println("Decoded string: " + new String(valueDecoded));

Output:

Decoded string: hello world

edited Jun 14 '17 at 05:56

answered Jun 14 '17 at 05:50

Michael Markidis

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Base64 Conversion

2 Answers2