SSM下Jedis的使用

1、在linux系統中搭建好redis集羣環境

2、接口定義

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);
}

3、單機版實現類

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;
	}

}

4、單機配置：applicationContext-redis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans4.2.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context4.2.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx4.2.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util4.2.xsd">
      
	<!-- 開啓註解 -->
     <context:annotation-config/>
	<!-- 配置單機版的連接 -->
	<bean id="jedisPool" class="redis.clients.jedis.JedisPool">
		<constructor-arg name="host" value="192.168.138.29"></constructor-arg>
		<constructor-arg name="port" value="6379"></constructor-arg>
	</bean>
	<bean id="jedisClientPool" class="lhz.lx.jedis.JedisClientPool"/>
	
</beans>

5、集羣版實現類

package lhz.lx.jedis;

import org.springframework.beans.factory.annotation.Autowired;

import redis.clients.jedis.JedisCluster;

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);
	}

}

6、集羣配置：applicationContext-redis.xml

<!-- 集羣版的配置 -->
	<bean id="jedisCluster" class="redis.clients.jedis.JedisCluster">
		<constructor-arg>
			<set>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.138.29"></constructor-arg>
					<constructor-arg name="port" value="7001"></constructor-arg>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.138.29"></constructor-arg>
					<constructor-arg name="port" value="7002"></constructor-arg>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.138.29"></constructor-arg>
					<constructor-arg name="port" value="7003"></constructor-arg>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.138.29"></constructor-arg>
					<constructor-arg name="port" value="7004"></constructor-arg>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.138.29"></constructor-arg>
					<constructor-arg name="port" value="7005"></constructor-arg>
				</bean>
				<bean class="redis.clients.jedis.HostAndPort">
					<constructor-arg name="host" value="192.168.138.29"></constructor-arg>
					<constructor-arg name="port" value="7006"></constructor-arg>
				</bean>
			</set>
		</constructor-arg>
	</bean>
	<bean id="jedisClientCluster" class="lhz.lx.jedis.JedisClientCluster"/>
	<!-- 上面的端口和ip要和你配置的一樣哈-->

注意：單機版和集羣版不能共存，使用單機版時註釋集羣版的配置。使用集羣版，把單機版註釋。

7、封裝代碼測試

@Test
	public void testJedisClient() throws Exception {
		//初始化Spring容器
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext-*.xml");
		//從容器中獲得JedisClien接口對象
		JedisClient jedisClient = applicationContext.getBean(JedisClient.class);
		jedisClient.set("first", "100");
		String result = jedisClient.get("first");
		System.out.println(result);	
				
	}

8、實戰使用demo

//將查詢的分類做一個緩存
//因爲只能存儲字符串類型的數據，所以要進行轉換
@Override
	public List<TbContent> getContentList(long cid) {
		//查詢緩存
		try {
			String json = jedisClient.hget("CID", cid + "");
			//判斷json是否爲空
			if (StringUtils.isNotBlank(json)) {
				//把json轉換成list
				List<TbContent> list = JsonUtils.jsonToList(json, TbContent.class);
				return list;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		//根據cid查詢內容列表
		TbContentExample example = new TbContentExample();
		//設置查詢條件
		Criteria criteria = example.createCriteria();
		criteria.andCategoryIdEqualTo(cid);
		//執行查詢
		List<TbContent> list = contentMapper.selectByExample(example);
		//向緩存中添加數據
		try {
			jedisClient.hset("CID", cid + "", JsonUtils.objectToJson(list));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return list;
	}

9、緩存同步

注意：當內容信息做增刪改操作後只需要把對應緩存刪除即可。
可以根據cid刪除。
比如：進行了內容的修改

@Override
	public TaotaoResult updateContent(TbContent content) {
		//補全屬性
		content.setCreated(new Date());
		content.setUpdated(new Date());
		//插入數據
		contentMapper.insert(content);
		//緩存同步
		jedisClient.hdel(“CID”, content.getCategoryId().toString());
		
		return TaotaoResult.ok();
	}

10、總結

搭建集羣–》創建接口–》創建接口實現類–》配置Spring文件–》代碼使用(注意加入緩存和緩存同步)

導入jar包( -2.7.2 、pool2-2.4.2)

Pom:

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.7.2</version>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
    <version>2.4.2</version>
</dependency>