Java – Ler um arquivo e codifica-lo para Base64 – Converter File para Base64 (Encode file to Base64)

java

 private String encodeFileToBase64Binary(File file)
            throws IOException {

        byte[] bytes = loadFile(file);
        byte[] encoded = Base64.getEncoder().encode(bytes);
        String encodedString = new String(encoded);

        return encodedString;
    }

    private byte[] loadFile(File file) throws IOException {
        byte[] bytes;
        try (InputStream is = new FileInputStream(file)) {
            long length = file.length();
            if (length > Integer.MAX_VALUE) {
                throw new IOException("File to large " + file.getName());
            }
            bytes = new byte[(int) length];
            int offset = 0;
            int numRead = 0;
            while (offset < bytes.length
                    && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
                offset += numRead;
            }
            if (offset < bytes.length) {
                throw new IOException("Could not completely read file " + file.getName());
            }
        }
        return bytes;
    }