springboot使用redis保存session，实现共享session集群

1.pom.xml

<dependency>
  <groupId>org.springframework.session</groupId>
  <artifactId>spring-session-data-redis</artifactId>
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-pool2</artifactId>
</dependency>

2.开启@EnableRedisHttpSession

@SpringBootApplication
@EnableRedisHttpSession
public class SessionRedisClusterApplication {
    public static void main(String[] args) {
        SpringApplication.run(SessionRedisClusterApplication.class,args);
    }
}

@RestController
@Slf4j
public class MainController {

    @Value("${server.port}")
    private Integer port;

    @GetMapping("login")
    public String login(String username, HttpSession session){
        session.setAttribute("username",username);
        log.info("port="+port);
        return "login port="+port;
    }

    @GetMapping("test")
    public String test(HttpSession session){
        log.info("port="+port);
        return "login port="+port+" username="+session.getAttribute("username");
    }
}

3.nginx负载配置

upstream backendtest {
     server 127.0.0.1:8084;
     server 127.0.0.1:8085;
}

server {
    listen       80;
    server_name  www.test2.com;

    location / {
        proxy_pass http://backendtest;
        proxy_cookie_path / /;
        proxy_set_header   Host    $host;
        proxy_set_header   Remote_Addr  $remote_addr;
        proxy_set_header   X-Real-IP    $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        add_header Vary "Accept-Encoding,User-Agent";
    }
}

访问：http://www.test2.com/login?username=dkn
访问：http://www.test2.com/test

轮询返回数据：login port=8084 username=dkn 和 login port=8085 username=dkn