二进制照片转base64

Blob binPhoto = face.getFacephoto();

BufferedInputStream binis = new BufferedInputStream(binPhoto.getBinaryStream());

ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
byte[] buff = new byte[100];
int rc = 0;
while ((rc = binis.read(buff, 0, 100)) > 0) {
swapStream.write(buff, 0, rc);
}

return Base64.encode(swapStream.toByteArray());