springboot+redis實現分佈式session共享

 

 

官方文檔,它是spring session項目的redis相關的一個子文檔:https://docs.spring.io/spring-session/docs/2.0.0.BUILD-SNAPSHOT/reference/html5/guides/boot-redis.htmlhtml

 

在spring boot的文檔中,告訴咱們添加@EnableRedisHttpSession來開啓spring session支持,配置以下:html5

@Configuration  
@EnableRedisHttpSession  
public class RedisSessionConfig {  
} 

而@EnableRedisHttpSession這個註解是由spring-session-data-redis提供的,因此在pom.xml文件中添加:redis

複製代碼
<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>  
複製代碼

在配置文件application.properties裏配置spring sessionspring

spring.session.store-type=redis #指定redis實現spring session
server.session.timeout=600 # Session 過時時間,單位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鏈接信息服務器

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

加上端口號session

server.port=8080

定義一個Controllerapp

複製代碼
@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;  
    }  
}  
複製代碼

複製上面的工程,把port改成9090ide

兩個項目都啓動好spring-boot

首先訪問8080端口的設置sessionpost

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

接着,咱們訪問8080端口的sessions,返回:

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

最後,再訪問9090端口的sessions,返回:

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

可見,8080與9090兩個服務器返回結果同樣,實現了session的共享

若是此時再訪問9090端口的first的話,首先返回:

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

而兩個服務器的sessions都是返回:

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

這個時候打開redis客戶端,能夠查詢到session信息已經保存在redis裏。

注意點:

1.Redis版本要在2.8+

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