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

<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

@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

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

mybatis.configuration.cache-enabled: true

第六步：修改实体类实现 序列号接口

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

<?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