redis之登录模块的开发

UserHolder

此类封装了ThreadLocal保证了线程安全

package com.hmdp.utils;

import com.hmdp.dto.UserDTO;

public class UserHolder {
    private static final ThreadLocal<UserDTO> tl = new ThreadLocal<>();

    public static void saveUser(UserDTO user){
        tl.set(user);
    }

    public static UserDTO getUser(){
        return tl.get();
    }

    public static void removeUser(){
        tl.remove();
    }
}

拦截器

这里采用两个拦截器来对请求进行处理，保证了token能够持续刷新

package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author ChuYang
 * @version 1.0
 */
public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.判断是否需要拦截(ThreadLocal中是否有用户)
        if(UserHolder.getUser() == null){
            response.setStatus(401);
            return false;
        }
        //有用户，则放行
        return true;
    }
}
package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
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;

/**
 * @author ChuYang
 * @version 1.0
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        //2.基于TOKEN获取redis中的用户
        if (StrUtil.isBlank(token)) {
            //不存在，拦截，返回401
            return true;
        }
        String key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash()
                .entries(key);
        //3.判断用户是否存在
        if(userMap.isEmpty()){
            //4.不存在，拦截。返回401
            return true;
        }

        //5。将查询的Hash数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);


        //6.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //7.刷新token有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}

Service层