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通常情况下,Tomcat、Jetty等Servlet容器,会默认将Session保存在内存中。如果是单个服务器实例的应用,将Session保存在服务器内存中是一个非常好的方案。但是这种方案有一个缺点,就是不利于扩展。
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目前越来越多的应用采用分布式部署,用于实现高可用性和负载均衡等。那么问题来了,如果将同一个应用部署在多个服务器上通过负载均衡对外提供访问,如何实现Session共享?
实际上实现Session共享的方案很多,其中一种常用的就是使用Tomcat、Jetty等服务器提供的Session共享功能,将Session的内容统一存储在一个数据库(如MySQL)或缓存(如redis)中。
下面我们将在springcloud微服务项目中,使用redis实现简单高效的session共享。官网:www.fhadmin.org
eureka-server:注册中心
springcloud-session-redis:业务session所在项目
springcloud-session-zuul:路由网关
新建一个spring boot项目,命名springcloud-session-redis
pom
4.0.0 com.carry springcloud-session-redis 0.0.1-SNAPSHOT jar springcloud-session-redis Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 2.0.4.RELEASE UTF-8 UTF-8 1.8 Finchley.SR1 org.springframework.boot spring-boot-starter-data-redis org.springframework.session spring-session-data-redis org.apache.commons commons-pool2 org.springframework.boot spring-boot-starter-web org.springframework.cloud spring-cloud-starter-netflix-eureka-client org.springframework.boot spring-boot-starter-actuator org.springframework.cloud spring-cloud-dependencies ${spring-cloud.version} pom import org.springframework.boot spring-boot-maven-plugin
在application.yml中加入redis、eureka、port等配
server: port: 8090spring: application: name: service-session-redis redis: host: 192.168.68.100 port: 6379 password: 123456 timeout: 6000ms lettuce: pool: max-active: 8 max-wait: -1ms max-idle: 8 min-idle: 0 database: 0eureka: client: serviceUrl: defaultZone: http://admin:123456@localhost:8761/eureka/management: endpoints: web: exposure: include: "*" cors: allowed-origins: "*" allowed-methods: "*"
package com.carry.config;import org.springframework.context.annotation.Configuration;import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;@Configuration@EnableRedisHttpSessionpublic class RedisSessionConfig {}
package com.carry.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import org.springframework.cloud.context.config.annotation.RefreshScope;import org.springframework.util.StringUtils;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RefreshScopepublic class UserManagementController { /** * redis sesion共享 * * @param request * @return */ @GetMapping("/getUser") public String getUser(HttpServletRequest request) { HttpSession session = request.getSession(); String username = (String) session.getAttribute("username"); if (StringUtils.isEmpty(username)) { username = "testSessionRedis|" + System.currentTimeMillis(); session.setAttribute("username", username); } System.out.println("访问端口:" + request.getServerPort()); return username; }}
新建springboot项目,命名springcloud-session-zuul
4.0.0 com.carry springcloud-session-zuul 0.0.1-SNAPSHOT jar springcloud-session-zuul Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 2.0.4.RELEASE UTF-8 UTF-8 1.8 Finchley.SR1 org.springframework.cloud spring-cloud-starter-netflix-eureka-client org.springframework.cloud spring-cloud-starter-netflix-zuul org.springframework.cloud spring-cloud-dependencies ${spring-cloud.version} pom import org.springframework.boot spring-boot-maven-plugin
server: port: 1100spring: application: name: service-session-zuul zuul: ignoredServices: '*' #忽略所有未配置的service host: connect-timeout-millis: 20000 socket-timeout-millis: 20000 routes: redis-session-service: path: /user-session/** serviceId: service-session-redis sensitiveHeaders: "*" ribbon: #ribbon负载均衡参数配置 ReadTimeout: 5000 ConnectTimeout: 5000 eureka: client: serviceUrl: defaultZone: http://admin:123456@localhost:8761/eureka/
package com.carry;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.zuul.EnableZuulProxy;@EnableEurekaClient@SpringBootApplication@EnableZuulProxypublic class SpringcloudSessionZuulApplication { public static void main(String[] args) { SpringApplication.run(SpringcloudSessionZuulApplication.class, args); }}
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