Javassm - item1-12 (缓存商品 + 购物车 1)

@Autowired
private RedisTemplate redisTemplate;
/**
 * 根据分类id查询菜品
 *
 * @param categoryId
 * @return
 */
@GetMapping("/list")
@ApiOperation("根据分类id查询菜品")
public Result<List<DishVO>> list(Long categoryId) {

  String key = "dish_" + categoryId;
  // 查询 redis 是否存在对应菜品数据
  List<DishVO> list = (List<DishVO>) redisTemplate.opsForValue().get(key);

  // 存在 就直接返回
  if(list != null && !list.isEmpty())
      return Result.success(list);

  // 如果不存在 去对应数据表查找
  Dish dish = new Dish();
  dish.setCategoryId(categoryId);
  dish.setStatus(StatusConstant.ENABLE);//查询起售中的菜品

  list = dishService.listWithFlavor(dish);

  // 将查询数据放入 redis 缓存中
  redisTemplate.opsForValue().set(key, list);

  return Result.success(list);
}

@Autowired
  private RedisTemplate redisTemplate;
/**
 * 清理缓存数据
 * @param pattern
 */
private void cleanCache(String pattern){
  Set keys = redisTemplate.keys(pattern);
  redisTemplate.delete(keys);
}

package com.itheima;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;

@Slf4j
@SpringBootApplication
@EnableCaching//开启缓存注解功能
public class CacheDemoApplication {
    public static void maSpringApplication.ruin(String[] args) {
        n(CacheDemoApplication.class,args);
        log.info("项目启动成功...");
    }
}

/**
* CachePut：将方法返回值放入缓存
* value：缓存的名称，每个缓存名称下面可以有多个key
* key：缓存的key
*/
@PostMapping
  @CachePut(value = "userCache", key = "#user.id")//key的生成：userCache::1
  public User save(@RequestBody User user){
      userMapper.insert(user);
      return user;
  }

/**
* Cacheable：在方法执行前spring先查看缓存中是否有数据，如果有数据，则直接返回缓存数据；若没有数据，*调用方法并将方法返回值放到缓存中
* value：缓存的名称，每个缓存名称下面可以有多个key
* key：缓存的key
*/
@GetMapping
@Cacheable(cacheNames = "userCache",key="#id")
public User getById(Long id){
    User user = userMapper.getById(id);
    return user;
}

@DeleteMapping
@CacheEvict(cacheNames = "userCache",key = "#id")//删除某个key对应的缓存数据
public void deleteById(Long id){
    userMapper.deleteById(id);
}

@DeleteMapping("/delAll")
@CacheEvict(cacheNames = "userCache",allEntries = true)//删除userCache下所有的缓存数据
public void deleteAll(){
    userMapper.deleteAll();
}