Java Html圖片換成Base64字符串

public class Base64ImageConvert {

    public static String imageToBase64Str(String imgFileUrl) {

        byte[] data = null;

        try {
            InputStream in = new FileInputStream(imgFileUrl);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        }
        catch (IOException e) {
            //LOGGER.error("Convert exception,please check, {}!!!", e);
        }

        BASE64Encoder encoder = new BASE64Encoder();
        LOGGER.debug("convertImageToBase64Str method end!");
        return encoder.encode(data);
    }


    public static boolean base64StrToImage(String imgStr, String imgFileUrl) {
        
        BASE64Decoder decoder = new BASE64Decoder();
        OutputStream out = null;
        try {

            byte[] bytes = decoder.decodeBuffer(imgStr);
            for (int i = 0; i < bytes.length; ++i) {
                if (bytes[i] < 0) {
                    bytes[i] += 256;
                }
            }
            
            out = new FileOutputStream(imgFileUrl);
            out.write(bytes);
            out.flush();
            out.close(); 

        }
        catch (Exception e) {
            //LOGGER.error("Exception, {}", e);
            return false;
        }
        //LOGGER.debug("convetBase64StrToImage method end!");
        return true;
    }
    
    public static void main(String[] args) {
        
        String imgFileUrl = "D:\\20160525101557.png";
        String imgStr = imageToBase64Str(imgFileUrl);
        System.out.println(imgStr);
        
        base64StrToImage(imgStr, "D:\\20160526.png");
               
    }

}