Base64 Encoding using Java

In Below example we will learn how to use Base64 Encoding using Java

Finally Java8 incorporated Base64 Encoding. Base64 is one of the common Encoding mechanism.

Syntax

Base64.getEncoder().encodeToString(textForEncoding.getBytes());

Example

import java.util.Base64;

public class Base64Encodng {

	public static void main(String[] args) {
		try {
			String textForEncoding = "QWERTY TEXT";
			String encodedString = Base64.getEncoder().encodeToString(textForEncoding.getBytes());
			System.out.println(encodedString);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

Output

UVdFUlRZIFRFWFQ=

The length of output encoded String must be a multiple of 3. else the output will be padded with additional pad characters (`=`).
But we have option to encode without padding also

Syntax

Base64.getEncoder().withoutPadding().encodeToString(textForEncoding.getBytes());

Example without Padding

import java.util.Base64;

public class Base64Encodng {

	public static void main(String[] args) {
		try {
			String textForEncoding = "QWERTY TEXT";
			String encodedString = Base64.getEncoder().withoutPadding().encodeToString(textForEncoding.getBytes());
			System.out.println(encodedString);		

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

Output

UVdFUlRZIFRFWFQ

Decoding Syntax

Base64.getDecoder().decode(encodedString.getBytes());

Example

import java.util.Base64;

public class Base64Encodng {

	public static void main(String[] args) {
		try {
			String textForEncoding = "QWERTY TEXT";
			String encodedString = Base64.getEncoder().withoutPadding().encodeToString(textForEncoding.getBytes());
			System.out.println(encodedString);
			
			byte[] decodeByte = Base64.getDecoder().decode(encodedString.getBytes());
			String decodedValue=new String(decodeByte);
			System.out.println(decodedValue);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

Output

UVdFUlRZIFRFWFQ
QWERTY TEXT

Github

https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/Base64Encodng.java