临时：文件MD5

 

 

	/**
	 * MD5文件
	 * 
	 * @param file
	 * @return
	 * @throws Exception
	 */
	public static String md5file(File file) throws Exception {
		MessageDigest messageDigest = MessageDigest.getInstance("MD5");
		BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
		byte[] buf = new byte[1024 * 100];
		int p = 0;
		while ((p = in.read(buf)) != -1) {
			messageDigest.update(buf, 0, p);
		}
		in.close();
		byte[] digest = messageDigest.digest();

		BASE64Encoder encoder = new BASE64Encoder();
		return encoder.encode(digest);
	}