<dependencies>

     <dependency>

         <groupId>org.springframework.boot</groupId>

         <artifactId>spring-boot-starter-web</artifactId>

     </dependency>

     <dependency>

         <groupId>org.springframework.session</groupId>

         <artifactId>spring-session-data-redis</artifactId>

     </dependency>

     <dependency>

         <groupId>redis.clients</groupId>

         <artifactId>jedis</artifactId>

         <version>2.9.0</version>

     </dependency>

 </dependencies>

 # Session store type.

 spring.session.store-type=redis

 # Namespace for keys used to store sessions.

 spring.session.redis.namespace=spring:session

 # Redis server host.

 spring.redis.host=localhost

 # Redis server port.

 spring.redis.port=6379

 @RestController

 public class TestSessionShare {

     @GetMapping("session")

     public String getSession(HttpServletRequest request) {

         return request.getLocalPort() + " ---> " + request.getSession(true).getId();

     }

 }

 java -jar demo.jar --server.port=9988

 java -jar demo.jar --server.port=9999

 http {

     ......

     upstream sessionShare {

         server 127.0.0.1:9988 weight=1;

         server 127.0.0.1:9999 weight=1;

     }

     server {

         listen       80;

         server_name  localhost;

         location / {

             proxy_pass http://sessionShare;

         }

     }

     ......

 }