PImage encoded to Base64 String

imageBase64.pde

// This is for Java 7
// With Java 8 you can now say: 

import javax.xml.bind.DatatypeConverter;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;

// Load an image
PImage img = loadImage("file.jpg");

// Funky steps to convert to byte array
ByteBuffer byteBuffer = ByteBuffer.allocate(img.pixels.length * 4);       
IntBuffer intBuffer = byteBuffer.asIntBuffer();
intBuffer.put(img.pixels);
byte[] imgBytes = byteBuffer.array();

// Or maybe just better to load as bytes?
// byte[] imgBytes = loadBytes("file.png");

// Now make it a base 64 String
// Java 7
String base64String = DatatypeConverter.printBase64Binary(imgBytes);

// Java 8
// String base64String = Base64.getEncoder().encodeToString(imgBytes);

println(base64String);