SpringBoot 使用 Redis 做缓存

springboot 使用 redis 做缓存

1. maven 添加 redis 缓存支持

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

2. application.properties 配置

   ##===========Spring data redis========================================
   spring.redis.host=www.huangmp.cn
   spring.redis.port=6379
   spring.redis.pool.max-active=20
   spring.redis.pool.max-wait=200000
   spring.redis.pool.max-idle=20
   spring.redis.pool.min-idle=1
   #默认是索引为0的数据库
   spring.redis.database=1 
   

3. 添加 RedisConfiguration 配置类

   @Configuration
   @EnableCaching
   public class RedisConfiguration {
   
       @Bean
       public JedisConnectionFactory jedisConnectionFactory(){
           JedisConnectionFactory factory = new JedisConnectionFactory();
           factory.setHostName("www.huangmp.cn");
           factory.setPort(6379);
           factory.setDatabase(1);
           factory.setTimeout(60000);
           return factory;
       }
   
       @Bean
       public CacheManager cacheManager(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate){
           RedisCacheManager manager = new RedisCacheManager(redisTemplate);
           manager.setDefaultExpiration( 1000 * 60 * 60 * 12); // 12小时
           manager.setUsePrefix(true);
           return manager;
       }
   
   }
   

4. 添加 redis 对于 User 类的操作类 （dao层对象）

   @Repository
   public class UserRedis {
       @Autowired
       private RedisTemplate<String, String> redisTemplate;
   
       public void add(String key, Long time, User user) {
           redisTemplate.opsForValue().set(key, JsonUtils.objectToJson(user) , time, TimeUnit.MINUTES);
       }
   
       public void add(String key, Long time, List<User> users) {
           redisTemplate.opsForValue().set(key, JsonUtils.objectToJson(users), time, TimeUnit.MINUTES);
       }
       public User get(String key) {
           User user = null;
           String json = redisTemplate.opsForValue().get(key);
           if(!StringUtils.isEmpty(json))
               user = JsonUtils.jsonToPojo(json, User.class);
           return user;
       }
   
       public List<User> getList(String key) {
           List<User> ts = null;
           String listJson = redisTemplate.opsForValue().get(key);
           if(!StringUtils.isEmpty(listJson))
               ts = JsonUtils.jsonToList(listJson, User.class);
           return ts;
       }
   
       public void delete(String key){
           redisTemplate.opsForValue().getOperations().delete(key);
       }
   }
   

5. 在业务代码 使用 redis dao对象，启用 redis 缓存

   @Service
   public class UserService {
       @Autowired
       private UserRepository userRepository;
       @Autowired
       private UserRedis userRedis;
       private static final String keyHead = "mysql:get:user:";
   
       public User findById(Long id) {
           User user = userRedis.get(keyHead + id);
           if(user == null){
               user = userRepository.findOne(id);
               if(user != null)
                   userRedis.add(keyHead + id, 30L, user);
           }
           return user;
       }
   
       public User create(User user) {
           User newUser = userRepository.save(user);
           if(newUser != null)
               userRedis.add(keyHead + newUser.getId(), 30L, newUser);
           return newUser;
       }
   
       public User update(User user) {
           if(user != null) {
               userRedis.delete(keyHead + user.getId());
               userRedis.add(keyHead + user.getId(), 30L, user);
           }
           return userRepository.save(user);
       }
   
       public void delete(Long id) {
           userRedis.delete(keyHead + id);
           userRepository.delete(id);
       }
   
   

6. 启动项目进行测试

参考文档

Spring Data Redis 官方文档