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README
Apache-2.0

hsession介绍

hsession是一个解决j2ee 项目session共享问题的一个小工具,能够让同一个用户请求被转发到多台web服务器时,回话依然有效。

web.xml配置

<!-- 此过滤器 放在filter的最上面,否则可能 在此 filter 上面的filter 获取的session
  不是从memcache获取的,如果上面的filter 没有用到session则不影响-->
  <filter>
    <filter-name>sessionFilter</filter-name>
    <filter-class>com.hsession.filter.HSessionFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>sessionFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

cache.properties配置

#cache类型,可以使用自己写的其他类来实现com.hsession.cache.Cache
cache.type=com.hsession.memcached.MemCached
#memcached 缓存ip:port ,用,分隔 使用分布式memcache服务器
cache.servers=121.43.106.57:11211
cache.server.weights=10

Maven第三方依赖

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.7</version>
</dependency>
<dependency>
    <groupId>com.whalin</groupId>
    <artifactId>Memcached-Java-Client</artifactId>
    <version>3.0.0</version>
</dependency>

但是hsession可能会遇到的问题,需要考虑:

  • 分布式memcached服务器是通过hash算法来分别落到不同的服务器上,如果一台memcached服务器的down机可能造成一批用户的登陆态丢失,需要重新登录。
  • memcached 分块存储,如果优化不好可能会在成大量的内存浪费 或者数据丢失
  • memcached不是一个稳定的数据存储服务器,可能会出现不确定的数据丢失,用户可能会莫名其妙下线,作为优化,可以用数据库作为辅助,或者直接使用redis
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使用memcached来实现session共享 展开 收起
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Apache-2.0
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