SpringBoot实现redis缓存菜单列表

<!--  spring data redis依赖-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
  <version>2.5.1</version>
</dependency>
<!--      commons-pool2对象池依赖-->
<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-pool2</artifactId>
  <version>2.9.0</version>
</dependency>

/**
 * redis配置类
 */
@Configuration
public class RedisConfig {
    @Bean
    public RedisTemplate<String,Object> redisTemplate(RedisConnectionFactory redisConnectionFactory){
        RedisTemplate<String,Object> redisTemplate=new RedisTemplate<>();
        //String类型key序列器
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        //String类型value序列器
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        //Hash类型key序列器
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        //Hash类型value序列器
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        return redisTemplate;
    }
}

/**
 * <p>
 * 菜单表 服务实现类
 * </p>
 *
 * @author hhk
 * @since 2022-01-04
 */
@Service
public class MenuServiceImpl extends ServiceImpl<MenuMapper, Menu> implements IMenuService {

    @Autowired
    private MenuMapper menuMapper;
    @Autowired
    private RedisTemplate<String,Object> redisTemplate;
    /**
     * 根据用户id查询菜单列表
     * @return
     */
    @Override
    public List<Menu> getMenuByAdminId() {
        //getMenuByAdminId需要传用户id，这时候，要从security全局上下文中获取用户id,SecurityContextHolder.getContext().getAuthentication().getPrincipal()获取当前用户对象
        Admin principal = (Admin) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
        //获取到用户id
        Integer id = principal.getId();
        ValueOperations<String, Object> valueOperations = redisTemplate.opsForValue();
        List<Menu> menus=((List<Menu>) valueOperations.get("menu_" + id));//获取redis缓存中的菜单列表
        if(CollectionUtils.isEmpty(menus)){//如果是空，则从数据库中获取
            menus= menuMapper.getMenuByAdminId(id);
            //将数据设置到redis中
            valueOperations.set("menu_"+id,menus);
        }
        return menus;
    }
}