base64图片文件保存及读取

港控/mmm° 2024-04-20 09:22 79阅读 0赞

/**
         * <保存图片文件>
         *
         * @param imgPath    图片存储路径
         * @param imgName    图片名称
         * @param fileBase64 图片base64
         * @throws
         */
        public void saveImg(String imgPath, String imgName, String fileBase64)
        {
            //对字节数组字符串进行Base64解码并生成图片
            if (null == fileBase64)
            {
                //图像数据为空
                LOGGER.error("img is empty.");
                return;
            }
    
            OutputStream out = null;
            BASE64Decoder decoder = new BASE64Decoder();
            try
            {
                //Base64解码
                byte[] b = decoder.decodeBuffer(fileBase64);
                for (int i = 0; i < b.length; ++i)
                {
                    if (b[i] < 0)
                    {
                        //调整异常数据
                        b[i] += 256;
                    }
                }
                //生成jpeg图片
                out = new FileOutputStream(imgPath + imgName);
                out.write(b);
                out.flush();
                out.close();
            }
            catch (Exception e)
            {
                LOGGER.error("save img catch exception. cause: ", e);
                return;
            }
            finally
            {
                LOGGER.info("[finally] save img.");
                if (null != out)
                {
                    try
                    {
                        out.close();
                        out = null;
                    }
                    catch (IOException e)
                    {
                        LOGGER.error("close fileOutPutStream fail. cause:", e);
                    }
                }
            }
        }

/**
         * <根据图片指定路径获取图片的base64 string>
         *
         * @param imgUrl 图片路径
         * @return 结果
         * @throws
         */
        public String getImgStr(String imgUrl)
        {
            //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
            InputStream in = null;
            byte[] data = null;
            //读取图片字节数组
            try
            {
                in = new FileInputStream(imgUrl);
                data = new byte[in.available()];
                in.read(data);
                in.close();
    
                //对字节数组Base64编码
                BASE64Encoder encoder = new BASE64Encoder();
                return encoder.encode(data);//返回Base64编码过的字节数组字符串
            }
            catch (IOException e)
            {
                LOGGER.error("read img catch exception. cause: ", e);
                return "";
            }
            finally
            {
                if (null != in)
                {
                    try
                    {
                        in.close();
                        in = null;
                    }
                    catch (IOException e)
                    {
                        LOGGER.error("close inputStream error. cause: ", e);
                        return "";
                    }
                }
            }
        }