【Redis】SpringBoot+MyBatis集成Redis二级缓存

た入场券 2023-10-05 13:54 9阅读 0赞

在pom文件中增加如下依赖

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    <dependency>
    	<groupId>redis.clients</groupId>
    	<artifactId>jedis</artifactId>
    	<version>3.2.0</version>
    </dependency>

spring配置文件`application.properties`中新增如下配置

#配置redis连接
    #因为在我的电脑的hosts文件中已经配置了与CentOS的主机映射关系，在此主机地址可以直接使用CentOS代替
    spring.redis.host=CentOS
    #redis端口号
    spring.redis.port=6379
    #连接时间
    spring.redis.timeout=5s
    #redis连接池参数
    spring.redis.lettuce.shutdown-timeout=100ms
    #连接池最大连接数（使用负值表示没有限制）默认为8
    spring.redis.lettuce.pool.max-active=10
    #连接池中最大的空闲连接，默认为8
    spring.redis.lettuce.pool.max-idle=8
    #连接池最大阻塞等待时间（使用负值表示没有限制）默认-1
    spring.redis.lettuce.pool.max-wait=5ms
    #连接池中最小空闲连接 默认为0
    spring.redis.lettuce.pool.min-idle=1

新增以下类

**ApplicationContextHolder.java**

/**
    * 该接口为标记接口，Spring工厂在初始化时，会自动注入applicationContext
    */
    @Component
    public class ApplicationContextHolder implements ApplicationContextAware {
        
        private static ApplicationContext applicationContex;
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        
            // this.applicationContex = applicationContext;
            applicationContex = applicationContext;
        }
    
        public static Object getBean(String beanName) {
        
            return applicationContex.getBean(beanName);
        }
    }

**UserDefineRedisCache.java**

/**
     * 自定义redis缓存
     */
    public class UserDefineRedisCache implements Cache {
        
        private Logger logger = LoggerFactory.getLogger(UserDefineRedisCache.class);
    
        private String id; //存储namespace
        private long timeout = 300; //超时时间
        private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    
        private RedisTemplate redisTemplate; //(RedisTemplate) ApplicationContextHolder.getBean("redisTemplate");
    
        public UserDefineRedisCache(String id) {
        
            this.id = id;
        }
    
        private RedisTemplate getRedisTemplate() {
        
            return (RedisTemplate) ApplicationContextHolder.getBean("redisTemplate");
        }
    
        @Override
        public String getId() {
        
            return id;
        }
    
        @Override
        public void putObject(Object key, Object value) {
        
            if (redisTemplate == null) {
        
                redisTemplate = getRedisTemplate();
            }
            logger.debug("将查询结果存储到cache.key:" + key + ",value:" + value);
            ValueOperations opsForValue = redisTemplate.opsForValue();
            opsForValue.set(key, value, timeout, TimeUnit.SECONDS);
        }
    
        @Override
        public Object getObject(Object key) {
        
            if (redisTemplate == null) {
        
                redisTemplate = getRedisTemplate();
            }
            logger.debug("从缓存中读取结果.key:" + key);
            ValueOperations opsForValue = redisTemplate.opsForValue();
            return opsForValue.get(key);
        }
    
        @Override
        public Object removeObject(Object key) {
        
            if (redisTemplate == null) {
        
                redisTemplate = getRedisTemplate();
            }
            logger.debug("从缓存中清除.key:" + key);
            ValueOperations opsForValue = redisTemplate.opsForValue();
            Object value = opsForValue.get(key);
            redisTemplate.delete(key);
            return value;
        }
    
        @Override
        public void clear() {
        
            if (redisTemplate == null) {
        
                redisTemplate = getRedisTemplate();
            }
            logger.debug("从缓存中清除缓存区所有数据");
            redisTemplate.execute((RedisConnection connection) -> {
        
                connection.flushAll();
                return null;
            });
        }
    
        @Override
        public int getSize() {
        
            return 0;
        }
    
        @Override
        public ReadWriteLock getReadWriteLock() {
        
            return readWriteLock;
        }
    
        public void setTimeout(long timeout) {
        
            this.timeout = timeout;
        }
    }

在SpringBoot启动类中加入如下方法

//配置RedisBean
    @Bean
    public RedisTemplate<Object, Object> redisTemplate(LettuceConnectionFactory connectionFactory) throws UnknownHostException {
        
        RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(connectionFactory);
        //设置Key、value的序列化
        redisTemplate.setKeySerializer(new JdkSerializationRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return redisTemplate;
    }

在MyBatis配置文件中开启mybatis二级缓存

<cache type="com.dora.cache.UserDefineRedisCache">
        
        <property name="timeout" value="150"/>
    </cache>