springboot怎么使用redis注解

在Spring Boot中使用Redis注解，需要完成以下步骤：

添加Redis依赖：在pom.xml文件中添加Redis相关依赖，例如：

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

配置Redis连接：在application.properties文件中配置Redis连接信息，包括主机、端口、密码等。例如：

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

创建Redis配置类：创建一个配置类，用于配置Redis连接工厂和Redis模板等。例如：

@Configuration@EnableCachingpublic class RedisConfig {@Beanpublic 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;}@Beanpublic RedisTemplate<Object, Object> redisTemplate() {RedisTemplate<Object, Object> template = new RedisTemplate<>();template.setConnectionFactory(redisConnectionFactory());template.setDefaultSerializer(new GenericJackson2JsonRedisSerializer());return template;}}

在需要使用Redis的类或方法上添加注解：可以使用@Cacheable、@CachePut、@CacheEvict等注解来实现缓存操作。例如：

@Servicepublic class UserService {@Autowiredprivate 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);}}

启用缓存：在启动类上添加@EnableCaching注解，开启缓存功能。例如：

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

这样，就可以在Spring Boot中使用Redis注解进行缓存操作了。