shiro刷新权限

	/**
	 * @title 刷新用户权限
	 * @param principal
	 * @desc principal为用户的认证信息
	 */
	public static void  reloadAuthorizing(Object principal) throws Exception{
		RealmSecurityManager rsm = (RealmSecurityManager) SecurityUtils.getSecurityManager();
		MyShiroRealm myShiroRealm = (MyShiroRealm) rsm.getRealms().iterator().next();

		Subject subject = SecurityUtils.getSubject();
		String realmName = subject.getPrincipals().getRealmNames().iterator().next();
		SimplePrincipalCollection principals = new SimplePrincipalCollection(principal, realmName);
		subject.runAs(principals);
		if(myShiroRealm.isAuthenticationCachingEnabled()) {					
			myShiroRealm.getAuthenticationCache().remove(principals);
		}
		if(myShiroRealm.isAuthorizationCachingEnabled()) {
			// 删除指定用户shiro权限
			myShiroRealm.getAuthorizationCache().remove(principals);
		}
		// 刷新权限
		subject.releaseRunAs();
	}