自己实现的spring-session

spring session

自己实现spring-session，实现单点登陆的功能使用filter拦截用户的请求，在filter中包装request，在request的包装类requestWrapper中，重写getSession（），和getSession(boolean create)。自己实现httpSession，在getSession中获取cookie，从cookie中读取sessionId，如果没有sessionId就新创建session，如果有sessionId，就去redis中查看是否有此id的记录，如果没有就新建session，如果有，还是新建session，并把redis中此session的相关数据赋值给新建的session，最后保存sessionId到cookie，cookie的maxAge设置为-1，仅对当前会话有效。 redis的操作使用redisTemplate实现。

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