springboot+redis集群实现redis集群状态下的session共享

以你之姓@ 2022-05-14 05:18 338阅读 0赞

**springboot+redis的案例很多,但是redis集群的案例很少,so~笔者在这里记录一下~**

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一、springboot依靠@EnableRedisHttpSession来开启spring session支持，该注解是由spring-session-data-redis提供的，所以在pom.xml文件中添加如下依赖：

<dependency>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-redis</artifactId>
    		<version>1.4.6.RELEASE</version>
    	</dependency>
    	<dependency>
    		<groupId>org.springframework.session</groupId>
    		<artifactId>spring-session-data-redis</artifactId>
    	</dependency>

二、配置@EnableRedisHttpSession来开启spring session支持

方法一：在springboot启动类上加上@EnableRedisHttpSession来开启spring session支持，其中maxInactiveIntervalInSeconds 的值是session过期时间

方法二：重建redisSession管理类，加上EnableRedisHttpSession配置

@Configuration  
    
    @EnableRedisHttpSession  (maxInactiveIntervalInSeconds = 1800)
    
    public class RedisSessionConfig { 
    
    
    }

三、在配置文件（application.properties文件或者yaml文件）中配置redis服务器的位置

spring.redis.cluster.nodes=Centos6701:6379,Centos6701:6380,Centos6702:6380,Centos6702:6379,Centos6703:6380,Centos6703:6379

yaml:
     spring:  
       redis:  
         cluster:  
           nodes:  
            - Centos6701:6379  
            - Centos6701:6380
            - Centos6702:6380
            - Centos6702:6379 
            - Centos6703:6379 
            - Centos6703:6380

四、测试

1、 首先在application.properties中进行设置开启两个tomcat服务，端口分别为8080和9090

2、定义一个Controller

@RestController  
    
    @RequestMapping(value = "/admin/v1")  
    
    public class QuickRun {  
    
    
        @RequestMapping(value = "/first", method = RequestMethod.GET)  
    
        public Map<String, Object> firstResp (HttpServletRequest request){  
    
    
            Map<String, Object> map = new HashMap<>();  
    
            request.getSession().setAttribute("request Url", request.getRequestURL());  
    
            map.put("request Url", request.getRequestURL());  
    
            return map;  
    
        }  
    
     
        @RequestMapping(value = "/sessions", method = RequestMethod.GET)  
    
        public Object sessions (HttpServletRequest request){  
    
    
            Map<String, Object> map = new HashMap<>();  
    
            map.put("sessionId", request.getSession().getId());  
    
            map.put("message", request.getSession().getAttribute("map"));  
    
            return map;  
        }  
    
    }

3、启动之后进行访问测试，首先访问8080端口的tomcat，返回

{"request Url":"http://localhost:8080/admin/v1/first"}

接着访问8080端口的sessions，返回

{"sessionId":"efcc85c0-9ad2-49a6-a38f-9004403776b5","message":"http://localhost:8080/admin/v1/first"}

最后访问9090端口的sessions，返回

{"sessionId":"efcc85c0-9ad2-49a6-a38f-9004403776b5","message":"http://localhost:8080/admin/v1/first"}

可见，8080与9090两个服务器返回结果一样，实现了session的共享

如果此时再访问9090端口的first的话，首先返回：

{"request Url":"http://localhost:9090/admin/v1/first"}

而两个服务器的sessions都是返回：

{"sessionId":"efcc85c0-9ad2-49a6-a38f-9004403776b5","message":"http://localhost:9090/admin/v1/first"}

通过spring boot + redis来实现session的共享非常简单，而且用处也极大，配合nginx进行负载均衡，便能实现分布式的应用了。

本次的redis并没有进行主从、读写分离、使用zookeeper进行负载均衡等等配置，而且nginx的单点故障也是应用的障碍。

参考文档：

[https://www.cnblogs.com/mengmeng89012/p/5519698.html][https_www.cnblogs.com_mengmeng89012_p_5519698.html]

[https://blog.csdn.net/qq\_32143169/article/details/78183325][https_blog.csdn.net_qq_32143169_article_details_78183325]

[https://blog.csdn.net/qq\_32143169/article/details/78183263][https_blog.csdn.net_qq_32143169_article_details_78183263]

[https_www.cnblogs.com_mengmeng89012_p_5519698.html]: https://www.cnblogs.com/mengmeng89012/p/5519698.html
[https_blog.csdn.net_qq_32143169_article_details_78183325]: https://blog.csdn.net/qq_32143169/article/details/78183325
[https_blog.csdn.net_qq_32143169_article_details_78183263]: https://blog.csdn.net/qq_32143169/article/details/78183263