Base64字符保存图片，图片转换成Base64字符编码

//文件转换成Base64编码  
  public static String getFileBase64Str(String filePath) throws IOException {
        String filePath = System.getProperty("user.dir") + "//src//test//resources//idcard//" + fileName;
        System.out.println("测试文件：" + filePath);
        File file = new File(filePath);
        byte[] front = org.apache.commons.io.FileUtils.readFileToByteArray(file);
        return Base64.getEncoder().encodeToString(front);
    }

/　注意Base64字符串不要有空格和回车　

  public static void main(String[] args) {
        String strImg = GetImageStr();
        System.out.println(strImg);

        GenerateImage(strImg);

    }

    //图片转化成base64字符串
    public static String GetImageStr() {//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 = "C:\\Users\\18285\\Desktop\\22.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();
        return encoder.encode(data);//返回Base64编码过的字节数组字符串
    }

    //base64字符串转化成图片
    public static boolean GenerateImage(String imgStr) {   //对字节数组字符串进行Base64解码并生成图片
        if (imgStr == null) //图像数据为空
            return false;
        BASE64Decoder decoder = new BASE64Decoder();
        try {

            byte[] b = Base64Utils.decode(imgStr.getBytes());
            //Base64解码
            //byte[] b = decoder.decodeBuffer(imgStr);
            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
            String imgFilePath = "C:\\Users\\18285\\Desktop\\new.jpg";//新生成的图片
            OutputStream out = new FileOutputStream(imgFilePath);
            out.write(b);
            out.flush();
            out.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }