在Spring Boot中使用Redis注解，需要完成以下步驟：

1. 添加Redis依賴：在pom.xml文件中添加Redis相關依賴，例如：

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

2. 配置Redis連接：在application.properties文件中配置Redis連接信息，包括主機、端口、密碼等。例如：

spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.password=

3. 創建Redis配置類：創建一個配置類，用于配置Redis連接工廠和Redis模板等。例如：

@Configuration
@EnableCaching
public class RedisConfig {
@Bean
public RedisConnectionFactory redisConnectionFactory() {
RedisStandaloneConfiguration configuration = new RedisStandaloneConfiguration();
configuration.setHostName("127.0.0.1");
configuration.setPort(6379);
configuration.setPassword(RedisPassword.none());
LettuceConnectionFactory factory = new LettuceConnectionFactory(configuration);
factory.afterPropertiesSet();
return factory;
}
@Bean
public RedisTemplate<Object, Object> redisTemplate() {
RedisTemplate<Object, Object> template = new RedisTemplate<>();
template.setConnectionFactory(redisConnectionFactory());
template.setDefaultSerializer(new GenericJackson2JsonRedisSerializer());
return template;
}
}

4. 在需要使用Redis的類或方法上添加注解：可以使用@Cacheable、@CachePut、@CacheEvict等注解來實現緩存操作。例如：

@Service
public class UserService {
@Autowired
private UserRepository userRepository;
@Cacheable(value = "users", key = "#id")
public User getUserById(Long id) {
return userRepository.findById(id).orElse(null);
}
@CachePut(value = "users", key = "#user.id")
public User saveUser(User user) {
return userRepository.save(user);
}
@CacheEvict(value = "users", key = "#id")
public void deleteUser(Long id) {
userRepository.deleteById(id);
}
}

5. 啟用緩存：在啟動類上添加@EnableCaching注解，開啟緩存功能。例如：

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

這樣，就可以在Spring Boot中使用Redis注解進行緩存操作了。