这里通过SpringSession来实现Session的共享，Session数据存储在Redis中

SpringSession的操作指南：

https://docs.spring.io/spring-session/docs/2.5.6/reference/html5/guides/boot-redis.html

导入相关的依赖

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

设置对应的配置（yaml文件或者其它)

spring:
  session:
    store-type: redis
    redis:
      namespace: spring:session

在各服务的启动类上添加注解

@EnableRedisHttpSession

默认存储在redis db0，若想自定义设置

@Configuration
@EnableRedisHttpSession
public class HttpSessionConfig {

    @Bean
    public RedisConnectionFactory redisConnectionFactory() {
        LettuceConnectionFactory connectionFactory = new LettuceConnectionFactory();
        connectionFactory.setDatabase(1); // 设置使用第 1 号数据库
        return connectionFactory;
    }

    @Bean
    public HttpSessionConfiguration httpSessionConfiguration() {
        HttpSessionConfiguration config = new HttpSessionConfiguration();
        config.setMaxInactiveIntervalInSeconds(1800); // 设置会话过期时间为 30 分钟
        return config;
    }
}