shiro通過sessionid獲取Session

　　/**
     * 通過sessionid獲取Session
     * @param sessionId
     * @return Session
     */
    public static Session getSessionById(String sessionId){
        SessionKey sessionKey = new SessionKey() {
            @Override
            public Serializable getSessionId() {
                return sessionId;
            }
        };
        return SecurityUtils.getSecurityManager().getSession(sessionKey);
    }