<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
  <version>1.5.2.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.springframework.session</groupId>
  <artifactId>spring-session-data-redis</artifactId>
  <version>1.3.0.RELEASE</version>
</dependency>

# Redis配置
spring.session.store-type=redis
spring.redis.database=0
spring.redis.host=localhost
spring.redis.port=6379

@SpringBootApplication
@EnableRedisHttpSession
@RestController
public class DemoApplication {

  private Logger logger = LoggerFactory.getLogger(this.getClass());

  public static void main(String[] args) {
    SpringApplication app = new SpringApplication(DemoApplication.class);
    app.setWebEnvironment(true);
    app.run(args);
  }

  @GetMapping("/hello")
  public ResponseEntity<?> hello(HttpSession session) {
    if (session.isNew()) {
      logger.info("Successfully creates a session ，the id of session ：" + session.getId());
      session.setAttribute("key", "hello");
    } else {
      logger.info("session already exists in the server, the id of session ："+ session.getId());
      logger.info(session.getAttribute("key").toString());
    }
    return new ResponseEntity<>("Hello World", HttpStatus.OK);
  }

}

redis-cli

127.0.0.1:6379> keys * 
(empty list or set)

2017-06-12 00:26:12.601 INFO 9580 — [nio-8080-exec-1] 
ication$$EnhancerBySpringCGLIB$$de942542 : Successfully creates a session ，the id of session ：4368a535-9bfa-406b-975c-e58c2bca1e75

2017-06-12 00:30:43.533 INFO 9580 — [nio-8080-exec-5] 
ication$$EnhancerBySpringCGLIB$$de942542 : session already exists in the server, the id of session ：4368a535-9bfa-406b-975c-e58c2bca1e75 
2017-06-12 00:30:43.533 INFO 9580 — [nio-8080-exec-5] 
ication$$EnhancerBySpringCGLIB$$de942542 : hello