spring项目中将sessionid对应的cookie过期时间设置很长,但是实际session还是在半个小时后失效,跟了一下代码,spring中session实现接口为

org.springframework.session.SessionRepository

public interface SessionRepository<S extends Session> {
    S createSession();

    void save(S var1);

    S findById(String var1);

    void deleteById(String var1);
}

这个接口有两个实现类:

MapSessionRepository
RedisOperationsSessionRepository

单机环境使用前者,分布式环境使用后者,来看后者代码:

org.springframework.session.data.redis.RedisOperationsSessionRepository

public RedisOperationsSessionRepository.RedisSession createSession() {
        RedisOperationsSessionRepository.RedisSession redisSession = new RedisOperationsSessionRepository.RedisSession();
        if(this.defaultMaxInactiveInterval != null) {
            redisSession.setMaxInactiveInterval(Duration.ofSeconds((long)this.defaultMaxInactiveInterval.intValue()));
        }

        return redisSession;
    }

org.springframework.session.data.redis.RedisOperationsSessionRepository.RedisSession

RedisSession() {
            this(new MapSession());
            this.delta.put("creationTime", Long.valueOf(this.getCreationTime().toEpochMilli()));
            this.delta.put("maxInactiveInterval", Integer.valueOf((int)this.getMaxInactiveInterval().getSeconds()));
            this.delta.put("lastAccessedTime", Long.valueOf(this.getLastAccessedTime().toEpochMilli()));
            this.isNew = true;
            this.flushImmediateIfNecessary();
        }

        public boolean isExpired() {
            return this.cached.isExpired();
        }

org.springframework.session.MapSession

public boolean isExpired() {
        return this.isExpired(Instant.now());
    }

    boolean isExpired(Instant now) {
        return this.maxInactiveInterval.isNegative()?false:now.minus(this.maxInactiveInterval).compareTo(this.lastAccessedTime) >= 0;
    }

 

可见是在创建session的时候设置两个时间,

lastAccessedTime
maxInactiveInterval

如果 当前时间 - maxInactiveInterval > lastAccessedTime 就会认为session过期,设置的方法:

@EnableRedisHttpSession(maxInactiveIntervalInSeconds=2000) 

 

  • 由于大魔王先生能力有限,文中可能存在错误,欢迎指正、补充!