package org.kodejava.commons.codec;

import org.apache.commons.codec.binary.Base64;

import java.util.Arrays;

public class Base64Encode {
    public static void main(String[] args) {
        String hello = "Hello World";

        // The encodeBase64 method take a byte[] as the parameter. The byte[]
        // can be from a simple string like in this example, or it can be from
        // an image file data.
        byte[] encoded = Base64.encodeBase64(hello.getBytes());

        // Print the encoded byte array
        System.out.println(Arrays.toString(encoded));

        // Print the encoded string
        String encodedString = new String(encoded);
        System.out.println(hello + " = " + encodedString);
    }
}

The result of our program:

[83, 71, 86, 115, 98, 71, 56, 103, 86, 50, 57, 121, 98, 71, 81, 61]
Hello World = SGVsbG8gV29ybGQ=

Maven Dependencies

<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.16.0</version>
</dependency>