public String uploadMethod(@RequestParam("file") MultipartFile file,
			HttpServletRequest request) {

		if (!file.isEmpty()) {
			try {
				BASE64Encoder encoder = new BASE64Encoder();
				// 通过base64来转化图片
				String data = encoder.encode(file.getBytes());


			} catch (Exception e) {
				e.printStackTrace();
			}
		}

		return null;
	}

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;