Session

轻量的分布式会话组件(A Lightweight Distribute Session Component)

• 包引入(maven dependency):

   <dependency>
       <groupId>me.hao0</groupId>
       <artifactId>session-redis</artifactId>
       <version>1.0.0</version>
   </dependency>

• 依赖包，注意引入项目时是否需要排除(exclude if necessary):

   <dependency>
       <groupId>me.hao0</groupId>
       <artifactId>session-api</artifactId>
       <version>1.0.0</version>
   </dependency>
   <dependency>
       <groupId>redis.clients</groupId>
       <artifactId>jedis</artifactId>
       <version>2.7.2</version>
   </dependency>
   

• Servlet-Filter机制(Mechanism)

  

• SessionFilter如何工作(How SessionFilter Works):

  

• 使用(Usage):

  • 在web.xml中配置Filter(Config Filter in web.xml):

     <filter>
         <filter-name>RedisSessionFilter</filter-name>
         <filter-class>me.hao0.session.redis.RedisSessionFilter</filter-class>
         <init-param>
         	  <!-- cookie中的sessionId名称 -->
         	  <!-- the session id in cookie -->
             <param-name>sessionCookieName</param-name>
             <param-value>scn</param-value>
         </init-param>
         <init-param>
         	  <!-- session过期时间(秒) -->
         	  <!-- session expired time in seconds -->
             <param-name>maxInactiveInterval</param-name>
             <param-value>1800</param-value>
         </init-param>
         <init-param>
         	  <!-- cookie上下文路径 -->
         	  <!-- cookie context path -->
             <param-name>cookieContextPath</param-name>
             <param-value>/</param-value>
         </init-param>
         <init-param>
         	  <!-- cookie域名 -->
         	  <!-- cookie domain -->
             <param-name>cookieDomain</param-name>
             <param-value>session.com</param-value>
         </init-param>
         <init-param>
         	  <!-- cookie保存时间(秒) -->
         	  <!-- cookie lifetime in seconds -->
             <param-name>cookieMaxAge</param-name>
             <param-value>1800</param-value>
         </init-param>

  RedisSessionFilter /* ``` + 在**classpath**下配置**session.properties**(Config **session.properties** in **classpath**)

    ```ruby
    # redis model: is sentinel or not, default is not sentinel
    # session.redis.mode=	
    
    # session serialize class, default is JsonSerializer
    # session.serializer=
    
    # redis host
    session.redis.host=localhost
    
    # redis port
    session.redis.port=6379
    
    # redis max connections, default is 5
    # session.redis.pool.max.total=5
    
    # redis max idle connections, default is 2
    # session.redis.pool.max.idle=2
    
    # redis session id prefix
    session.redis.prefix=sid
    ``` 
  

• Demo:

  • 配置**/etc/hosts**(config /etc/hosts):

     127.0.0.1 demo1.session.com demo2.session.com

  • 假如使用nginx作web代理，配置server(config server if use nginx):

     upstream session_server {
         server localhost:10000;
         server localhost:10001;
     }
    
     server {
         listen 80;
         server_name demo1.session.com demo2.session.com;
     
         location / {
            proxy_pass 	http://session_server;
            proxy_set_header   X-Real-IP $remote_addr;
            proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header   Host $http_host;
         }
     }

  • 运行session-demo(run session-demo):

     # demo1.session.com
     mvn clean jetty:run -Dmaven.test.skip -Djetty.port=10000 
     # demo2.session.com
     mvn clean jetty:run -Dmaven.test.skip -Djetty.port=10001 

  • 测试(Test):

    • 用户首页(user index):

       http://demo1.session.com/users/index
       http://demo2.session.com/users/index

    • 用户登录(user login):

       http://demo1.session.com/users/login?username=admin&passwd=admin
       http://demo2.session.com/users/login?username=admin&passwd=admin

    • 用户登出(user logout):

       http://demo1.session.com/users/logout
       http://demo2.session.com/users/logout

• 使用其它的存储，如Memcache(Use other storage, Memcache, etc):

  1. 继承SessionFilter(inherit SessionFilter);
  2. 实现SessionManager(implement SessionManager)。

• 相关文档(References):

  • FilterChain机制(Filter Chain Mechanism)；

• 历史版本(Release History):

  • 1.0.0:

    • 基本功能实现(basic implementation)。

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