Redis缓存在java中的应用
在java中使用redis缓存步骤
1:通常在java中使用redis缓存 可以定义一个接口 分别对应单机版和集群版做两个实现类
接口的定义:
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);
}
单机版的实现类
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;
}
}
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.xsdhttp://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">
<bean id="jedisPool" class="redis.clients.jedis.JedisPool">
<constructor-arg name="host" value="192.168.25.153">constructor-arg>
<constructor-arg name="port" value="6379">constructor-arg>
bean>
<bean id="jedisClientPool" class="实现类的路径"/>
</beans>
集群版的实现类:
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);
}
}
集群版的applicationContext.xml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="192.168.25.153">constructor-arg>
<constructor-arg name="port" value="7001">constructor-arg>
bean>
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.153">constructor-arg>
<constructor-arg name="port" value="7002">constructor-arg>
bean>
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.153">constructor-arg>
<constructor-arg name="port" value="7003">constructor-arg>
bean>
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.153">constructor-arg>
<constructor-arg name="port" value="7004">constructor-arg>
bean>
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.153">constructor-arg>
<constructor-arg name="port" value="7005">constructor-arg>
bean>
<bean class="redis.clients.jedis.HostAndPort">
<constructor-arg name="host" value="192.168.25.153">constructor-arg>
<constructor-arg name="port" value="7006">constructor-arg>
bean>
set>
constructor-arg>
bean>
<bean id="jedisClientCluster"class="集群被类的全路径"/>
注意:集群版和单机版的配置只能存在一个
@Test
public void testJedisClient() throws Exception {
//初始化Spring容器
ApplicationContext applicationContext = newClassPathXmlApplicationContext("classpath:spring/applicationContext-*.xml");
//从容器中获得JedisClient对象
JedisClient jedisClient =applicationContext.getBean(JedisClient.class);
jedisClient.set("first", "100");
String result = jedisClient.get("first");
System.out.println(result);
在使用时我们只需要注入接口JedisClient接口 而不用管他的具体实现 然后就可以正常操作redis 使用