springboot 使用jedis 集成 redis 实现 mybatis 二级缓存

第一步：pom.xml引入相关依赖

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<dependency>             <groupId>org.mybatis.spring.boot</groupId>             <artifactId>mybatis-spring-boot-starter</artifactId>             <version>1.3.2</version>         </dependency> <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-redis</artifactId>             <version>1.4.6.RELEASE</version>         </dependency>

注：mybatis 相关使用我在这里就不写了

第二步：编写RedisConfig 配置类

@Configuration
public class RedisConfig {
    public JedisPoolConfig getRedisConfig(){
        JedisPoolConfig config = new JedisPoolConfig();
        config.setMaxIdle(8);
        config.setMaxTotal(8);
        config.setMaxWaitMillis(2);
        config.setMinIdle(0);
        return config;
    }
    @Bean(name = "jedisConnectionFactory")
    public JedisConnectionFactory getConnectionFactory(){
        JedisConnectionFactory factory = new JedisConnectionFactory(getRedisConfig());
        factory.setHostName("127.0.0.1");
        factory.setPassword("123456");
        return factory;
    }
}

第三步：编写RedisCacheTransfer 用以实例化JedisConnectionFactory

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@Component public class RedisCacheTransfer {     @Autowired     public void setJedisConnectionFactory(JedisConnectionFactory jedisConnectionFactory) {         RedisCache.setJedisConnectionFactory(jedisConnectionFactory);     } }

第四步：编写RedisCache 并且实现 Cache接口

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import org.apache.ibatis.cache.Cache; //特意把cache包路径写出来防止你们导错包 public class RedisCache implements Cache {     private static final Logger logger = LoggerFactory.getLogger(RedisCache.class);     @Autowired     private static JedisConnectionFactory jedisConnectionFactory;     private final String id;     private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();       public RedisCache(final String id){         if (id == null){             throw new IllegalArgumentException("Cache instances require an Id");         }         logger.debug("RedisCache id = {}", id);         this.id = id;     }     @Override     public String getId() {         return this.id;     }       @Override     public void putObject(Object key, Object value) {         logger.debug("putObject  Key = {} , value = {}",key,value);         JedisConnection connection = null;         try {             connection = (JedisConnection) jedisConnectionFactory.getConnection();             RedisSerializer<Object> serializer = new JdkSerializationRedisSerializer();             connection.set(serializer.serialize(key),serializer.serialize(value));         }catch (JedisConnectionException e){             e.printStackTrace();         }finally {             if (connection != null){                 connection.close();             }         }     }       @Override     public Object getObject(Object key) {         logger.debug("getObject key = {}",key);         Object result = null;         JedisConnection connection = null;         try {             connection = (JedisConnection) jedisConnectionFactory.getConnection();             RedisSerializer<Object> serializer = new JdkSerializationRedisSerializer();             result = serializer.deserialize(connection.getJedis().get(serializer.serialize(key)));           }catch (JedisConnectionException e){             e.printStackTrace();         }finally {             if (connection!=null){                 connection.close();             }         }         return result;     }       @Override     public Object removeObject(Object key) {         logger.debug("removeObject key = {}",key);         JedisConnection connection = null;         Object result = null;         try {             connection = (JedisConnection) jedisConnectionFactory.getConnection();             RedisSerializer<Object> serializer = new JdkSerializationRedisSerializer();             result = connection.getJedis().exists(serializer.serialize(key));         }catch (JedisConnectionException e){             e.printStackTrace();         }finally {             if (connection != null){                 connection.close();             }         }         return result;     }       @Override     public void clear() {         logger.debug("clear");         JedisConnection connection = null;         try {             connection = (JedisConnection) jedisConnectionFactory.getConnection();             connection.getJedis().flushAll();             connection.getJedis().flushDB();         }catch (JedisConnectionException e){             e.printStackTrace();         }finally {             if (connection != null){                 connection.close();             }         }     }       @Override     public int getSize() {         logger.debug("getSize");         int result = 0;         JedisConnection connection = null;         try {             connection = (JedisConnection) jedisConnectionFactory.getConnection();             result = Integer.valueOf(connection.getJedis().dbSize().toString());         }catch (JedisConnectionException e){             e.printStackTrace();         }finally {             connection.close();         }         return result;     }       @Override     public ReadWriteLock getReadWriteLock() {         logger.debug("getReadWriteLock");         return this.readWriteLock;     }     public static void setJedisConnectionFactory(JedisConnectionFactory jedisConnectionFactory){         logger.debug("setJedisConnectionFactory");         RedisCache.jedisConnectionFactory = jedisConnectionFactory;     } }

第五步：application.yml 内开启 mybatis 二级缓存

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1	mybatis.configuration.cache-enabled: true

第六步：修改实体类实现 序列号接口

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public class ResourceDO  implements Serializable {     //此处是成员变量以及get set方法 }

第七步：在mapping 中添加cache 标签

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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.qianxiao.blog.mapper.ResourceDOMapper">     <cache type="com.qianxiao.blog.cache.RedisCache" eviction="LRU" flushInterval="100000" readOnly="true" size="1024"></cache>     <sql id="tableName">         resource     </sql> <select id="findById" resultType="com.qianxiao.blog.dataobject.ResourceDO">         select * from <include refid="tableName" /> where id = #{id}         order by id desc         LIMIT 0,1     </select> </mapper>

　　注：想了解cache 里面各属性请查看我这一篇文章：https://www.cnblogs.com/qianxiaoPro/p/14201364.html

第八步：查看效果

 

redis内