JedisClient操作redis 单机版和集群版

一、在pom文件中添加依赖

<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>3.0.1</version>
</dependency>

二、准备JedisClient接口

public interface JedisClient {

    String set(String key, String value);
    String get(String key);
    Boolean exists(String key);
    Long expire(String key, int seconds);
    Long ttl(String key);
    Long incr(String key);
    Long hset(String key, String field, String value);
    String hget(String key, String field);
    Long hdel(String key, String... field);
}

三、实现

1.单机版

public class JedisClientPool implements JedisClient {

	@Autowired
	private JedisPool jedisPool;

	@Override
	public String set(String key, String value) {
		Jedis jedis = jedisPool.getResource();
		String result = jedis.set(key, value);
		jedis.close();
		return result;
	}

	@Override
	public String get(String key) {
		Jedis jedis = jedisPool.getResource();
		String result = jedis.get(key);
		jedis.close();
		return result;
	}

	@Override
	public Boolean exists(String key) {
		Jedis jedis = jedisPool.getResource();
		Boolean result = jedis.exists(key);
		jedis.close();
		return result;
	}

	@Override
	public Long expire(String key, int seconds) {
		Jedis jedis = jedisPool.getResource();
		Long result = jedis.expire(key, seconds);
		jedis.close();
		return result;
	}

	@Override
	public Long ttl(String key) {
		Jedis jedis = jedisPool.getResource();
		Long result = jedis.ttl(key);
		jedis.close();
		return result;
	}

	@Override
	public Long incr(String key) {
		Jedis jedis = jedisPool.getResource();
		Long result = jedis.incr(key);
		jedis.close();
		return result;
	}

	@Override
	public Long hset(String key, String field, String value) {
		Jedis jedis = jedisPool.getResource();
		Long result = jedis.hset(key, field, value);
		jedis.close();
		return result;
	}

	@Override
	public String hget(String key, String field) {
		Jedis jedis = jedisPool.getResource();
		String result = jedis.hget(key, field);
		jedis.close();
		return result;
	}

	@Override
	public Long hdel(String key, String... field) {
		Jedis jedis = jedisPool.getResource();
		Long result = jedis.hdel(key, field);
		jedis.close();
		return result;
	}

}

　　（2）集群版

public class JedisClientCluster implements JedisClient {

	@Autowired
	private JedisCluster jedisCluster;

	@Override
	public String set(String key, String value) {
		return jedisCluster.set(key, value);
	}

	@Override
	public String get(String key) {
		return jedisCluster.get(key);
	}

	@Override
	public Boolean exists(String key) {
		return jedisCluster.exists(key);
	}

	@Override
	public Long expire(String key, int seconds) {
		return jedisCluster.expire(key, seconds);
	}

	@Override
	public Long ttl(String key) {
		return jedisCluster.ttl(key);
	}

	@Override
	public Long incr(String key) {
		return jedisCluster.incr(key);
	}

	@Override
	public Long hset(String key, String field, String value) {
		return jedisCluster.hset(key, field, value);
	}

	@Override
	public String hget(String key, String field) {
		return jedisCluster.hget(key, field);
	}

	@Override
	public Long hdel(String key, String... field) {
		return jedisCluster.hdel(key, field);
	}

　　四、配置文件

<!-- redis单机版 -->
	<!-- <bean id="jedisPool" class="redis.clients.jedis.JedisPool">
		<constructor-arg name="host" value="192.168.206.132"/>
		<constructor-arg name="port" value="7001"/>
	</bean>
	<bean id="jedisClientPool" class="com.taotao.jedis.JedisClientPool"/> -->
	<!-- redis集群 -->
	<bean id="jedisCluster" class="redis.clients.jedis.JedisCluster">
		<constructor-arg>
			<set>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.206.132"/>
					<constructor-arg name="port" value="7001"/>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.25.132"/>
					<constructor-arg name="port" value="7002"/>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.25.132"/>
					<constructor-arg name="port" value="7003"/>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.206.132"/>
					<constructor-arg name="port" value="7004"/>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.206.132"/>
					<constructor-arg name="port" value="7005"/>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.206.132"/>
					<constructor-arg name="port" value="7006"/>
				</bean>
			</set>
		</constructor-arg>
	</bean>
	<bean id="jedisClientCluster" class="com.taotao.jedis.JedisClientCluster"/>

　　

五、测试

   @Test
    public void testJedis(){
        //初始化spring容器
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("classpath:spring/applicationContext-redis.xml");
        //从容器中获得jedisclient对象
        JedisClient jedisClient = applicationContext.getBean(JedisClient.class);
        //使用JedisClient操作redis
        jedisClient.set("ok", "test666");
        String result = jedisClient.get("ok");
        System.out.println(result);
    }

六、向业务逻辑中添加缓存

注：添加缓存不能影响正常的业务逻辑

　　查询时，业务中应该先去缓存中查询

　　如果缓存中没有，在数据库查询

　　将数据库查询到的结果添加到缓存中

　　推荐使用的数据类型为hash

如下代码：

public List<TbContent> getContentList(long cid) {
        //查询缓存
        try {
            String json = jedisClient.hget(CONTENT_KEY, cid + "");
            //判断json是否为空
            if (StringUtils.isNotBlank(json)) {
                //把json转换成list
                List<TbContent> list = JsonUtils.jsonToList(json, TbContent.class);
                return list;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        //根据cid查询内容列表
        TbContentExample example = new TbContentExample();
        //设置查询条件
        Criteria criteria = example.createCriteria();
        criteria.andCategoryIdEqualTo(cid);
        //执行查询
        List<TbContent> list = contentMapper.selectByExample(example);
        //向缓存中添加数据
        try {
            jedisClient.hset(CONTENT_KEY, cid + "", JsonUtils.objectToJson(list));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

七、缓存同步

　　对内容信息做增删改操作后只需要把对应缓存删除即可

        //缓存同步
        jedisClient.hdel(CONTENT_KEY, content.getCategoryId().toString());