public class MyHttpSessionStrategy implements HttpSessionStrategy {

    private final Logger logger = LoggerFactory.getLogger(WlwHttpSessionStrategy.class);

	//這用Qualifier註解，如果你的工程還集成了spring-data-redis,需要指定一下用哪一個
    @Qualifier("sessionRedisTemplate")
    @Autowired
    private RedisTemplate redisTemplate;
//過期時間，與session過期時間保持一致
    private Long maxInactiveIntervalInSeconds = 999L;
    private String xxxRedisName = "spring:session:xxx:";
	//當客戶端沒有傳xxx引數的時候，避免建立多個無用的session佔用redis空間
    private String defaultSessionId = "default-sessionid";

    /**
     * 客戶端傳過來的是xxx，需要通過xxx查詢對映關係，拿到sessionid返回
     */
    public String getRequestedSessionId(HttpServletRequest request) {
        String xxx = request.getParameter("xxx");
        ValueOperations<String, String> vops = redisTemplate.opsForValue();
        if (xxx != null && !xxx.equals("")) {
            String sessionid = vops.get(xxxRedisName + xxx);
            if(sessionid!=null){
                redisTemplate.expire(xxxRedisName + xxx, maxInactiveIntervalInSeconds, TimeUnit.SECONDS);
            }
            return sessionid;
        } else {
            return vops.get(xxxRedisName+defaultSessionId);
        }
    }

    /**
     * 建立session時，儲存xxx和sessionid的對映關係
     */
    public void onNewSession(Session session, HttpServletRequest request,
                             HttpServletResponse response) {
        String xxx = request.getParameter("xxx");
        String sessionid = session.getId();
        ValueOperations<String, String> vops = redisTemplate.opsForValue();
        if (xxx != null && !xxx.equals("")) {
            //儲存xxx和sessionid對映關係
            vops.set(xxxRedisName + xxx, sessionid);
            redisTemplate.expire(xxxRedisName + xxx, maxInactiveIntervalInSeconds, TimeUnit.SECONDS);
        }else{
            //沒有傳xxx時，儲存為預設
            vops.set(xxxRedisName+defaultSessionId, sessionid);
            redisTemplate.expire(xxxRedisName+defaultSessionId, maxInactiveIntervalInSeconds, TimeUnit.SECONDS);
        }
    }

    public void onInvalidateSession(HttpServletRequest request,
                                    HttpServletResponse response) {
        String xxx = request.getParameter("xxx");
        redisTemplate.expire(xxxRedisName + xxx, 0, TimeUnit.SECONDS);
    }

}