This is an example of how to decode Strings with the Base64 algorithm. We are using theorg.apache.commons.codec.binary.Base64 class that provides Base64 encoding and decoding as defined by RFC 2045. Decoding withorg.apache.commons.codec.binary.Base64 class implies that you should:

• Create a String.
• Get the bytes from the String, usinggetBytes() API method of String.
• UsedecodeBase64(byte[] base64Data) API method, using the byte array from the String to decode Base64 data into octets.
• Print the decoded array, using thetoString(byte[] a) API method ofArrays.

Let’s take a look at the code snippet that follows:  

package com.javacodegeeks.snippets.core; import org.apache.commons.codec.binary.Base64; import java.util.Arrays; public class decodeBase64 {    public static void main(String[] args) {        String string = "SmF2YWNvZGVnZWVrcw==";   // Get bytes from string  byte[] byteArray = Base64.decodeBase64(string.getBytes());   // Print the decoded array  System.out.println(Arrays.toString(byteArray));   // Print the decoded string   String decodedString = new String(byteArray);  System.out.println(string + " = " + decodedString);    }}

Output:

[74, 97, 118, 97, 99, 111, 100, 101, 103, 101, 101, 107, 115]SmF2YWNvZGVnZWVrcw== = Javacodegeeks

  
This was an example of how to decode Strings with the Base64 algorithm in Java.

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