base64和byte[]相互转换

   /**     * 上传图片获取图片base64码,然后解码,然后转成字节数组,以流的形式输出到本地     * @return     * @throws Exception     */    @RequestMapping(value = "/uploadYujhImg1", method = RequestMethod.POST)    @ResponseBody    public EntityServiceResponse<Map<String, String>> uploadYujhImg1(String fileImg) throws Exception {        logger.info("uploadYujh"+fileImg);        String imgBase64 = fileImg.replaceAll("data:image/png;base64,","");        BASE64Decoder d = new BASE64Decoder();        byte[] data = d.decodeBuffer(imgBase64);        FileOutputStream os = new FileOutputStream("D:\\tupian\\d.jpg");        os.write(data);        os.close();        return null;    }///////////////////////////////////////////////////////////////////////////////////////////
  
//读取本地图片输入流//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
   public static void  main (String arg[]) throws IOException {
        //读取本地图片输入流
        //将图片文件转化为字节数组字符串，并对其进行Base64编码处理
        String imgFile = "D:\\tupian\\a.jpg";//待处理的图片
        InputStream in = null;
        byte[] data = null;
        //读取图片字节数组
        try
        {
            in = new FileInputStream(imgFile);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        //对字节数组Base64编码
        BASE64Encoder encoder = new BASE64Encoder();
        System.out.println(encoder.encode(data));//返回Base64编码过的字节数组字符串
    }