@Override
	protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken)
			throws AuthenticationException {
		UsernamePasswordToken token = (UsernamePasswordToken) authcToken;
		User user = loginService.findUserByUsername(token.getUsername());
		if (user != null) {
			// 不加密認證
			// return new SimpleAuthenticationInfo(new
			// ShiroUser(user.getId(),user.getUsername()),user.getPassword(),getName());
			// 加密認證
			byte[] salt = Encodes.decodeHex(user.getSalt());
			return new SimpleAuthenticationInfo(new ShiroUser(user.getId(), user.getUsername()), user.getPassword(),
					ByteSource.Util.bytes(salt), getName());
		} else {
			return null;
		}
	}
	
	//指定shiro密碼加密方式，shiro用password和salt加密後得到的字串和資料庫中的字串對比
	@PostConstruct
	public void initCredentialsMatcher() {
		HashedCredentialsMatcher matcher = new HashedCredentialsMatcher("SHA-1");
		setCredentialsMatcher(matcher);
	}