import com.sun.org.apache.xerces.internal.impl.dv.util.Base64; byte[] data = "Hello, World!".getBytes(); String encodedData = Base64.encode(data); import com.sun.org.apache.xerces.internal.impl.dv.util.Base64; String encodedData = "SGVsbG8sIFdvcmxkIQ=="; byte[] decodedData = Base64.decode(encodedData);