本篇文章主要来源gaodai#ma#com搞@@代~&码*网介绍了SpringBoot+Mybatis项目使用Redis做Mybatis的二级缓存的方法，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
介绍
使用mybatis时可以使用二级缓存提高查询速度，进而改善用户体验。
使用redis做mybatis的二级缓存可是内存可控，管理方便。
1.在pom.xml文件中引入redis依赖
org.springframework.bootspring-boot-starter-data-redis
2.在application.properties配置文件中进行redis的配置
## Redis spring.redis.database=0 spring.redis.host=172.16.3.123 spring.redis.port=6379 spring.redis.password= spring.redis.pool.max-active=8 spring.redis.pool.max-wait=-1 spring.redis.pool.max-idle=8 spring.redis.pool.min-idle=0 spring.redis.timeout=0
3.创建cache包，然后创建两个类，一个ApplicationContextHolder实现ApplicationContextAware接口，具体内容如下
package com.ruijie.SpringBootandRedis.cache; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; @Component public class ApplicationContextHolder implements ApplicationContextAware { private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext ctx) throws BeansException { applicationContext = ctx; } /** * Get application context from everywhere * * @return */ public static ApplicationContext getApplicationContext() { return applicationContext; } /** * Get bean by class * * @param clazz * @param * @return */ public static T getBean(Class clazz) { return applicationContext.getBean(clazz); } /** * Get bean by class name * * @param name * @param * @return */ public static T getBean(String name) { return (T) applicationContext.getBean(name); } }
4.创建RedisCache类实现Cache接口，具体内容如下：
package com.ruijie.SpringBootandRedis.cache; import org.apache.ibatis.cache.Cache; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.data.redis.core.RedisCallback; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.core.ValueOperations; import java.util.concurrent.TimeUnit; import java.util.concurrent.locks.ReadWriteLock; import java.util.concurrent.locks.ReentrantReadWriteLock; public class RedisCache implements Cache { private static final Logger logger = LoggerFactory.getLogger(RedisCache.class); private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock(); private final String id; // cache instance id private RedisTemplate redisTemplate; private static final long EXPIRE_TIME_IN_MINUTES = 30; // redis过期时间 public RedisCache(String id) { if (id == null) { throw new IllegalArgumentException("Cache instances require an ID"); } this.id = id; } @Override public String getId() { return id; } /** * Put query result to redis * * @param key * @param value */ @Override public void putObject(Object key, Object value) { try { RedisTemplate redisTemplate = getRedisTemplate(); ValueOperations opsForValue = redisTemplate.opsForValue(); opsForValue.set(key, value, EXPIRE_TIME_IN_MINUTES, TimeUnit.MINUTES); logger.debug("Put query result to redis"); } catch (Throwable t) { logger.error("Redis put failed", t); } } /** * Get cached query result from redis * * @param key * @return */ @Override public Object getObject(Object key) { try { RedisTemplate redisTemplate = getRedisTemplate(); ValueOperations opsForValue = redisTemplate.opsForValue(); logger.debug("Get cached query result from redis"); System.out.println("****"+opsForValue.get(key).toString()); return opsForValue.get(key); } catch (Throwable t) { logger.error("Redis get failed, fail over to db", t); return null; } } /** * Remove cached query result from redis * * @param key * @return */ @Override @SuppressWarnings("unchecked") public Object removeObject(Object key) { try { RedisTemplate redisTemplate = getRedisTemplate(); redisTemplate.delete(key); logger.debug("Remove cached query result from redis"); } catch (Throwable t) { logger.error("Redis remove failed", t); } return null; } /** * Clears this cache instance */ @Override public void clear() { RedisTemplate redisTemplate = getRedisTemplate(); redisTemplate.execute((RedisCallback) connection -> { connection.flushDb(); return null; }); logger.debug("Clear all the cached query result from redis"); } /** * This method is not used * * @return */ @Override public int getSize() { return 0; } @Override public ReadWriteLock getReadWriteLock() { return readWriteLock; } private RedisTemplate getRedisTemplate() { if (redisTemplate == null) { redisTemplate = ApplicationContextHolder.getBean("redisTemplate"); } return redisTemplate; } }
5.实体类中要实现Serializable接口，并且要声明序列号
private static final long serialVersionUID = -2566441764189220519L;
6.开启Mybatis的二级缓存
在pom.xml配置文件中配置
mybatis.configuration.cache-enabled=true
在mapper接口中加入
@CacheNamespace(implementation=(com.demo.testdemo.cache.RedisCache.class))
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