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在上一篇中Redis实战之session共享，我们知道了通过Redis实现session共享了，那么token怎么续命呢？怎么刷新用户呢？本来咱们就通过拦截器来实现这两个功能。
登录拦截器优化：
先来看看现在拦截器情况：
拦截流程：
当拦截器拦截需要拦截到的url时候，才会在拦截器中更新用户token的过期时间。那如果，访问了不被拦截的路径，就不会给token续命的。这样就会导致用户token过期，而重新登录的。这样是不对的。
拦截了哪些路径？在config/MvcConfig中
当访问以上这些路径的是，就不会自动更新用户的token过期时间了。
优化：我们可以在现有拦截器签名价格拦截器：
将获取用户，存放threadLocal及刷新token放到新的拦截器中。
第一个拦截器就叫做：刷新token拦截器；第二个拦截器就叫做：用户拦截器
创建刷新token的拦截器：
import cn.hutool.core.bean.BeanUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;import static com.hmdp.constants.RedisConstants.LOGIN_USER_TOKEN_KEY;
import static com.hmdp.constants.RedisConstants.LOGIN_USER_TOKEN_TTL;/*** @author 凯哥Java* @description 刷新用户token的烂机器* @company*/
public class RefreshTokenInterceptor implements HandlerInterceptor {private StringRedisTemplate stringRedisTemplate;/*** 因为这个类不能被spring管理，所以不能直接注入RedisTemplate对象。通过构造函数传递** @param stringRedisTemplate*/public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {this.stringRedisTemplate = stringRedisTemplate;}@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {//1:从请求中获取到tokenString token = request.getHeader("authorization");if (StringUtils.isEmpty(token)) {return true;}//2:基于token获取redis中用户对象String key = LOGIN_USER_TOKEN_KEY + token;Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);//3：判断if (userMap.isEmpty()) {return true;}//将map转对象UserDTO user = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);UserHolder.saveUser(user);//刷新token的过期时间stringRedisTemplate.expire(key, LOGIN_USER_TOKEN_TTL, TimeUnit.MINUTES);return true;}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {UserHolder.removeUser();}
}
修改用户拦截器：
import com.hmdp.utils.UserHolder;
import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** @author 凯哥Java* @description 登录拦击器* @company*/
public class UserInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {//判断是否需要拦截if (UserHolder.getUser() == null) {response.setStatus(401);return false;}return true;}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {UserHolder.removeUser();}
}
修改MvcCofig。将两个拦截器添加进去，并设置拦截顺序:
import com.hmdp.interceptor.RefreshTokenInterceptor;
import com.hmdp.interceptor.UserInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import javax.annotation.Resource;/*** @author 凯哥Java* @description mvn的配置-添加拦截器* @company*/
@Configuration
public class MvcConfig implements WebMvcConfigurer {@Resourceprivate StringRedisTemplate stringRedisTemplate;@Overridepublic void addInterceptors(InterceptorRegistry registry) {//登录拦截器registry.addInterceptor(new UserInterceptor()).excludePathPatterns("/shop/**","/voucher/**","/shop-type/**","/upload/**","/blog/hot","/user/code","/user/login").order(1);//刷新token拦截器registry.addInterceptor(new RefreshTokenInterceptor(stringRedisTemplate)).addPathPatterns("/**").order(0);}
}