java 图片文件Base64编码与二进制编码格式互相转换

    public static byte[] base64String2ByteFun(String base64Str){  
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] b = null;
        try {
            b = decoder.decodeBuffer(base64Str);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        return b;  
    }
    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();
        }
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(data);
    }

 提示：

sun.misc.BASE64Encoder找不到jar包的解决方法

右键项目-》属性-》java bulid path-》jre System Library-》access rules-》resolution选择accessible，下面填上** 点击确定即可！！！