springboot+redis实现分布式session共享

时间:2023-03-09 06:41:07
springboot+redis实现分布式session共享

官方文档,它是spring session项目的redis相关的一个子文档:https://docs.spring.io/spring-session/docs/2.0.0.BUILD-SNAPSHOT/reference/html5/guides/boot-redis.html

在spring boot的文档中,告诉我们添加@EnableRedisHttpSession来开启spring session支持,配置如下:

@Configuration
@EnableRedisHttpSession
public class RedisSessionConfig {
}

而@EnableRedisHttpSession这个注解是由spring-session-data-redis提供的,所以在pom.xml文件中添加:

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

在配置文件application.properties里配置spring session

spring.session.store-type=redis #指定redis实现spring session
server.session.timeout=600 # Session 过期时间,单位s
spring.session.redis.flush-mode= # Sessions 刷新模式
spring.session.redis.namespace= # Namespace for keys used to store sessions.

配置redis连接信息

spring.redis.host=localhost
spring.redis.password=secret
spring.redis.port=6379

加上端口号

server.port=8080

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;
}
}

复制上面的工程,把port改为9090

两个项目都启动好

首先访问8080端口的设置session

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

接着,我们访问8080端口的sessions,返回:

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

最后,再访问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"} 

这个时候打开redis客户端,可以查询到session信息已经保存在redis里。

注意点:

1.Redis版本要在2.8+