import sun.misc.BASE64Decoder;

    private String getBase64Picture(String imgBase64Str) {

        FileOutputStream fos = null;

        String uuid = UUID.randomUUID().toString();

        String staticPath = "d:/upsoft/test/img/";

        String relativePath = "/test/img/";

        File cutImgFile = new File(staticPath);

        if (!cutImgFile.exists()) {

            cutImgFile.mkdirs();

        }

        String picturePath = staticPath + uuid + ".jpg";

        try {

            byte[] fileDat = ImageStr2Bytes(imgBase64Str);

            File file = new File(picturePath);

            fos = new FileOutputStream(file);

            fos.write(fileDat);

            fos.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return relativePath + uuid + ".jpg";

    }

    public byte[] ImageStr2Bytes(String imgStr) {

        BASE64Decoder decoder = new BASE64Decoder();

        try {

            byte[] b = decoder.decodeBuffer(imgStr);

            return b;

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }