SpringBoot缓存注解之@Cacheable/@CacheEvict使用方式

<!-- Redis + 缓存 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

@SpringBootApplication
@EnableCaching // 必须加
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

spring:
  cache:
    type: redis
    redis:
      time-to-live: 3600000  # 默认1小时过期
      cache-null-values: false  # 不缓存null

@Cacheable(value = "userCache", key = "#userId")
public User getUserById(Long userId) {
    return userMapper.selectById(userId);
}

userCache::1001

// 单个参数
@Cacheable(value = "user", key = "#id")
// 对象参数取id
@Cacheable(value = "user", key = "#user.id")
// 方法名当key
@Cacheable(value = "dict", key = "#root.methodName")
// 组合key
@Cacheable(value = "order", key = "'uid:'+#userId+':type:'+#type")

// 只缓存成年用户
@Cacheable(value = "user", key = "#userId", condition = "#result.age >= 18")
// 结果不为null才缓存
@Cacheable(value = "user", key = "#userId", unless = "#result == null")

@CacheEvict(value = "userCache", key = "#user.id")
public void updateUser(User user) {
    userMapper.updateById(user);
}

@CacheEvict(value = "userCache", allEntries = true)
public void refreshAllUser() {
}

@CacheEvict(value = "user", key = "#userId", beforeInvocation = true)

@CachePut(value = "user", key = "#user.id")
public User updateUser(User user) {
    userMapper.updateById(user);
    return user;
}

@Caching(
    evict = {
        @CacheEvict(value = "user", key = "#userId"),
        @CacheEvict(value = "userOrder", key = "#userId")
    }
)
public void deleteUser(Long userId) {
}

@Cacheable(value = "userInfo", key = "#userId", unless = "#result == null")
public User getUser(Long userId) {
    return userMapper.selectById(userId);
}

@CacheEvict(value = "userInfo", key = "#user.id")
public void updateUser(User user) {
    userMapper.updateById(user);
}

@CacheEvict(value = "userInfo", key = "#userId")
public void deleteUser(Long userId) {
    userMapper.deleteById(userId);
}

@Cacheable(value = "productList", key = "#categoryId")
public List<Product> getProductList(Integer categoryId) {
    return productMapper.selectByCategory(categoryId);
}

@CacheEvict(value = "productList", allEntries = true)
public void refreshProduct() {
}

@Cacheable(value = "dictCache", key = "#dictType")
public List<Dict> getDict(String dictType) {
    return dictMapper.selectByType(dictType);
}