byte[] encode = Base64.encode("加密?".getBytes(), Base64.DEFAULT);
		byte[] encode2 = Base64.encode(encode, Base64.DEFAULT+1);
		System.out.println(new String(encode));
		System.out.println(new String(encode2));
		byte[] decode = Base64.decode(encode, Base64.DEFAULT);
		byte[] decode2 = Base64.decode(encode2, Base64.DEFAULT);
		System.out.println(new String(decode));
		System.out.println(new String(decode2));