使用base64上传文件

        //图片
        FileInputStream inputStream = new FileInputStream("D:\\111.jpg");
        //转成字节数组
        byte[] bytes = new byte[inputStream.available()];
        inputStream.read(bytes);
        inputStream.close();
        //base64编码，这边用的是sun.misc.BASE64Encoder这个类
        BASE64Encoder base64Encoder = new BASE64Encoder();
        String encode = base64Encoder.encode(bytes);
        //输出编码后的字符串
        System.out.println(encode);

        //解码为字节数组
        BASE64Decoder base64Decoder = new BASE64Decoder();
        byte[] bytes1 = base64Decoder.decodeBuffer(encode);
        //输出文件
        FileOutputStream fileOutputStream = new FileOutputStream("D:\\222.jpg");
        fileOutputStream.write(bytes1);
        fileOutputStream.close();