/*文件64位编码*/

public static void main(String[] args) {
   byte[] fileByte = toByteArray(newFile);
   String imgStr = new BASE64Encoder().encode(fileByte);
  }

/*读取文件的字节数组*/
public static byte[] toByteArray(File file) throws IOException {

        File f = file;

        if (!f.exists()) {

            throw new FileNotFoundException("file not exists");

        }

        ByteArrayOutputStream bos = new ByteArrayOutputStream((int) f.length());

        BufferedInputStream in = null;

        try {

            in = new BufferedInputStream(new FileInputStream(f));

            int buf_size = 1024;

            byte[] buffer = new byte[buf_size];

            int len = 0;

            while (-1 != (len = in.read(buffer, 0, buf_size))) {

                bos.write(buffer, 0, len);

            }

            return bos.toByteArray();

        } catch (IOException e) {

            e.printStackTrace();

            throw e;

        } finally {

            try {

                in.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

            bos.close();

        }

    }