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());
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