@Test
    public void Bases64(){
       String s = "5b0aa3ebab"+":"+"aa2bc60e27e44e7bb23896d5d4002f79";
       System.out.println("原字符串：" + s);
       String encryptString = encryptBASE64(s);
       System.out.println("加密后：" + encryptString);
       System.out.println("解密后：" + decryptBASE64(encryptString));
   }
    /**
     * BASE64解密
     *
     * @param key
     * @return
     * @throws Exception
     */
    public static String decryptBASE64(String key) {
        byte[] bt;
        try {
            bt = (new BASE64Decoder()).decodeBuffer(key);
            return new String(bt);//如果出现乱码可以改成： String(bt, "utf-8")或 gbk
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * BASE64加密
     *
     * @param key
     * @return
     * @throws Exception
     */
    public static String encryptBASE64(String key) {
        byte[] bt = key.getBytes();
        return (new BASE64Encoder()).encodeBuffer(bt);
    }

 /**
     * @return
     * @Description: 根据图片地址转换为base64编码字符串
     * @Author:
     * @CreateTime:
     */
    public static String getImageStr(String imgFile) {
        InputStream inputStream = null;
        byte[] data = null;
        try {
            inputStream = new FileInputStream(imgFile);
            data = new byte[inputStream.available()];
            inputStream.read(data);
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 加密
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(data);
    }

    /**
     * @param imgStr base64编码字符串
     * @param path   图片路径-具体到文件
     * @return
     * @Description: 将base64编码字符串转换为图片
     * @Author:
     * @CreateTime:
     */

    public static boolean generateImage(String imgStr, String path) {
        if (imgStr == null) return false;
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            byte[] b = decoder.decodeBuffer(imgStr);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            OutputStream out = new FileOutputStream(path);
            out.write(b);
            out.flush();
            out.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }

    @Test
    public void test64() {
        String imageStr = getImageStr("E:\\work\\退款直联\\imag\\j01.png");
        System.out.println(imageStr);
        generateImage(imageStr, "E:\\work\\退款直联\\imag\\j10.png");
    }