Redis实现Session共享与单点登录

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

spring:
  redis:
    database: 0
    host: 127.0.0.1
    port: 6379
    password:
    jedis.pool.max-idle: 100
    jedis.pool.max-wait: -1ms
    jedis.pool.min-idle: 2
    timeout: 2000ms

@EnableRedisHttpSession

@GetMapping("/setSessionValue")
public String setredisResult(HttpServletRequest request){
    request.getSession().setAttribute(request.getSession().getId(), "---测试数据---"+request.getRequestURL());
 
    System.out.println(request.getSession().getId());
    return "set成功，已经存入session域且redis里面也会有值";
}
 
@GetMapping("/getSessionValue")
public String redisResult(HttpServletRequest request) {
    System.out.println(request.getSession().getId());
    String value = String.valueOf(request.getSession().getAttribute(request.getSession().getId()));
    
    return "取值成功         :"+value;
}

 @GetMapping("/userLogin")
    public String setRedisResult(HttpServletRequest request){
 
        //第一次登录
 
        //1. 取出当期客户端的sessionId
        String sId=request.getSession().getId();
        //2. 查询该sessionId 是否存在于redis
        boolean exists = redisUtils.exists(sId);
 
        if (!exists){
            //2.1未登录过,进行用户信息的校验
            //如果通过后,写入session域进行共享,即使是负载不同端口,sessionId不会发生变化
            request.getSession().setAttribute(sId, "login success");
            redisUtils.setWithTime(sId,"login success",1000);
            return "success login!";
 
            //如果不通过,那么返回登录页面,省略
        }else {
            //2.2 已经登录过,则存入redis中刷新过期时间,再直接返回成功页面
            redisUtils.setWithTime(sId,"login success",1000);
            return " yes,you are allow!";
        }
 
    }
 
    @GetMapping("/userLoginOut")
    public String userLoginOut(HttpServletRequest request){
 
        String sId=request.getSession().getId();
        redisUtils.remove(sId);
        return "login out!";
    }

 //登录接口
    @GetMapping("/userLogin")
    public String setRedisResult(HttpServletRequest request, HttpServletResponse response){
        
        //第一次登录
 
        //1. 取出当期客户端的sessionId
        String sId=request.getSession().getId();
 
        String cookies = getCookies(request);
 
        if (cookies==null || cookies.equals("")){
 
            System.out.println("没有登录过,准备进行登录！");
            //执行登录逻辑
 
            //写入cookie
            writeLoginToken(response,sId); //这里设置cookie的过期时间应当与redis设置的时间且与session失效时间保持一致
            //写入redis
            redisUtils.setWithTime(sId,"userInfo",1000);
            System.out.println("登录成功！");
            return "success login!";
        }else{
 
            boolean exists = redisUtils.exists(cookies);
            if (exists){
 
                System.out.println("已经登录过,正常登录！");
                return " yes,you are allow!";
            }else {
 
                return "信息异常不允许登录";
            }
        }
    }