最近在学习springboot，session这个点一直困扰了我好久，今天把这些天踩的坑分享出来吧，希望能帮助更多的人。
<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>
#redis spring.redis.host=127.0.0.1 spring.redis.port=6379 spring.redis.password=123456 spring.redis.pool.max-idle=8 spring.redis.pool.min-idle=0 spring.redis.pool.max-active=8 spring.redis.pool.max-wait=-1 #超时一定要大于0 spring.redis.timeout=3000 spring.session.store-type=redis
在配置redis时需要确保redis安装正确，并且配置notify-keyspace-events Egx，spring.redis.timeout设置为大于0，我当时这里配置为0时springboot时启不起来。
//拦截登录失效的请求
public class RedisSessionInterceptor implements HandlerInterceptor
{
@Autowired
private StringRedisTemplate redisTemplate;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
{
//无论访问的地址是不是正确的，都进行登录验证，登录成功后的访问再进行分发，404的访问自然会进入到错误控制器中
HttpSession session = request.getSession();
if (session.getAttribute("loginUserId") != null)
{
try
{
//验证当前请求的session是否是已登录的session
String loginSessionId = redisTemplate.opsForValue().get("loginUser:" + (long) session.getAttribute("loginUserId"));
if (loginSessionId != null && loginSessionId.equals(session.getId()))
{
return true;
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
response401(response);
return false;
}
private void response401(HttpServletResponse response)
{
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json; charset=utf-8");
try
{
response.getWriter().print(JSON.toJSONString(new ReturnData(StatusCode.NEED_LOGIN, "", "用户未登录！")));
}
catch (IOException e)
{
e.printStackTrace();
}
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception
{
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception
{
}
}
@Configuration
public class WebSecurityConfig extends WebMvcConfigurerAdapter
{
@Bean
public RedisSessionInterceptor getSessionInterceptor()
{
return new RedisSessionInterceptor();
}
@Override
public void addInterceptors(InterceptorRegistry registry)
{
//所有已api开头的访问都要进入RedisSessionInterceptor拦截器进行登录验证，并排除login接口(全路径)。必须写成链式，分别设置的话会创建多个拦截器。
//必须写成getSessionInterceptor()，否则SessionInterceptor中的@Autowired会无效
registry.addInterceptor(getSessionInterceptor()).addPathPatterns("/api/**").excludePathPatterns("/api/user/login");
super.addInterceptors(registry);
}
}
@RestController
@RequestMapping(value = "/api/user")
public class LoginController
{
@Autowired
private UserService userService;
@Autowired
private StringRedisTemplate redisTemplate;
@RequestMapping("/login")
public ReturnData login(HttpServletRequest request, String account, String password)
{
User user = userService.findUserByAccountAndPassword(account, password);
if (user != null)
{
HttpSession session = request.getSession();
session.setAttribute("loginUserId", user.getUserId());
redisTemplate.opsForValue().set("loginUser:" + user.getUserId(), session.getId());
return new ReturnData(StatusCode.REQUEST_SUCCESS, user, "登录成功！");
}
else
{
throw new MyException(StatusCode.ACCOUNT_OR_PASSWORD_ERROR, "账户名或密码错误！");
}
}
@RequestMapping(value = "/getUserInfo")
public ReturnData get(long userId)
{
User user = userService.findUserByUserId(userId);
if (user != null)
{
return new ReturnData(StatusCode.REQUEST_SUCCESS, user, "查询成功！");
}
else
{
throw new MyException(StatusCode.USER_NOT_EXIST, "用户不存在！");
}
}
}
我在浏览器上登录，然后获取用户信息，再在postman上登录相同的账号，浏览器再获取用户信息，就会提示401错误了，浏览器需要重新登录才能获取得到用户信息，同样，postman上登录的账号就失效了。
浏览器：
postman：
分布式session需要解决两个难点：1、正确配置redis让springboot把session托管到redis服务器。2、唯一登录。
redis需要能正确启动到出现如下效果才证明redis正常配置并启动
同时还要保证配置正确
@EnableCaching
@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 30)//session过期时间(秒)
@Configuration
public class RedisSessionConfig
{
@Bean
public static ConfigureRedisAction configureRedisAction()
{
//让springSession不再执行config命令
return ConfigureRedisAction.NO_OP;
}
}
springboot启动后能在redis上查到缓存的session才能说明整个redis+springboot配置成功！
1、用户登录时，在redis中记录该userId对应的sessionId，并将userId保存到session中。
HttpSession session = request.getSession();
session.setAttribute("loginUserId", user.getUserId());
redisTemplate.opsForValue().set("loginUser:" + user.getUserId(), session.getId());
2、访问接口时，会在RedisSessionInterceptor拦截器中的preHandle()中捕获，然后根据该请求发起者的session中保存的userId去redis查当前已登录的sessionId，若查到的sessionId与访问者的sessionId相等，那么说明请求合法，放行。否则抛出401异常给全局异常捕获器去返回给客户端401状态。
唯一登录经过我的验证后满足需求，暂时没有出现问题，也希望大家能看看有没有问题，有的话给我点好的建议！
