Spring Cache集成redis

redis大家都耳熟能详了，spring context默认没有实现redis的cache相关接口，我们需要自己实现，并借助org.springframework.cache.support.SimpleCacheManager进行redis缓存管理。

添加jar包：

<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.5.2</version>
</dependency>

cache接口实现：

package org.springframework.cache.demo.redis;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.springframework.cache.Cache;
import org.springframework.cache.support.SimpleValueWrapper;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;

public class RedisCache implements Cache {

private RedisTemplate<String, Object> redisTemplate;
private String name;

public RedisTemplate<String, Object> getRedisTemplate() {
return redisTemplate;
}

public void setRedisTemplate(RedisTemplate<String, Object> redisTemplate) {
this.redisTemplate = redisTemplate;
}

public void setName(String name) {
this.name = name;
}

@Override
public String getName() {
return this.name;
}

@Override
public Object getNativeCache() {
return this.redisTemplate;
}

@Override
public ValueWrapper get(Object key) {
final String keyf = (String) key;
Object object = null;
object = redisTemplate.execute(new RedisCallback<Object>() {
public Object doInRedis(RedisConnection connection) throws DataAccessException {

byte[] key = keyf.getBytes();
byte[] value = connection.get(key);
if (value == null) {
return null;
}
return toObject(value);
}
});
return (object != null ? new SimpleValueWrapper(object) : null);
}

@Override
public void put(Object key, Object value) {
final String keyf = (String) key;
final Object valuef = value;
final long liveTime = 86400;

redisTemplate.execute(new RedisCallback<Long>() {
public Long doInRedis(RedisConnection connection) throws DataAccessException {
byte[] keyb = keyf.getBytes();
byte[] valueb = toByteArray(valuef);
connection.set(keyb, valueb);
if (liveTime > 0) {
connection.expire(keyb, liveTime);
}
return 1L;
}
});
}

/**
* 描述 : <Object转byte[]>. <br>
* <p>
* <使用方法说明>
* </p>
*
* @param obj
* @return
*/
private byte[] toByteArray(Object obj) {
byte[] bytes = null;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(obj);
oos.flush();
bytes = bos.toByteArray();
oos.close();
bos.close();
} catch (IOException ex) {
ex.printStackTrace();
}
return bytes;
}

/**
* 描述 : <byte[]转Object>. <br>
* <p>
* <使用方法说明>
* </p>
*
* @param bytes
* @return
*/
private Object toObject(byte[] bytes) {
Object obj = null;
try {
ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bis);
obj = ois.readObject();
ois.close();
bis.close();
} catch (IOException ex) {
ex.printStackTrace();
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
}
return obj;
}

@Override
public void evict(Object key) {
final String keyf = (String) key;
redisTemplate.execute(new RedisCallback<Long>() {
public Long doInRedis(RedisConnection connection) throws DataAccessException {
return connection.del(keyf.getBytes());
}
});
}

@Override
public void clear() {
redisTemplate.execute(new RedisCallback<String>() {
public String doInRedis(RedisConnection connection) throws DataAccessException {
connection.flushDb();
return "ok";
}
});
}

@SuppressWarnings("unchecked")
@Override
public <T> T get(Object key, Class<T> type) {
final String keyf = (String) key;
Object object = null;
object = redisTemplate.execute(new RedisCallback<Object>() {
public Object doInRedis(RedisConnection connection) throws DataAccessException {

byte[] key = keyf.getBytes();
byte[] value = connection.get(key);
if (value == null) {
return null;
}
return toObject(value);
}
});
return (T) object;
}

@Override
public ValueWrapper putIfAbsent(Object key, Object value) {
put(key, value);
return new SimpleValueWrapper(value);
}
}

spring配置：

<?xml version='1.0' encoding='UTF-8'?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:cache="http://www.springframework.org/schema/cache"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd"> 
<!-- 启用缓存注解功能，这个是必须的，否则注解不会生效，另外，该注解一定要声明在spring主配置文件中才会生效 -->
<cache:annotation-driven cache-manager="cacheManager"/>

<bean id="userService" class="org.springframework.cache.demo.UserService" />

<!-- spring自己的换管理器，这里定义了两个缓存位置名称 ，既注解中的value -->
<bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
<property name="caches">
<set>
<bean class="org.springframework.cache.demo.redis.RedisCache">
<property name="redisTemplate" ref="redisTemplate" />
<property name="name" value="userCache"/>
</bean>
</set>
</property>
</bean>

<!-- redis 相关配置 -->
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxIdle" value="300" />
<property name="maxWaitMillis" value="3000" />
<property name="testOnBorrow" value="true" />
</bean>
<bean id="connectionFactory"
class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:host-name="192.168.1.90" p:port="6379" p:pool-config-ref="poolConfig"
p:database="0" />
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
<property name="connectionFactory" ref="connectionFactory" />
</bean>
</beans>

除了以上方式，在spring-data项目中增加了对redis的支持spring-data-redis，单独引入依赖：

<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>1.4.2.RELEASE</version>
</dependency>

使用spring-data-redis提供的RedisTemplate对redis操作，spring配置如下：

<?xml version='1.0' encoding='UTF-8'?>
<beans xmlns='http://www.springframework.org/schema/beans'
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xmlns:context='http://www.springframework.org/schema/context'
xmlns:c='http://www.springframework.org/schema/c'
xmlns:p='http://www.springframework.org/schema/p'
xmlns:cache='http://www.springframework.org/schema/cache'
xsi:schemaLocation=' http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd
'>

<!-- 启用缓存注解功能，这个是必须的，否则注解不会生效，另外，该注解一定要声明在spring主配置文件中才会生效 -->
<cache:annotation-driven cache-manager="cacheManager" />

<bean id="userService" class="org.springframework.cache.demo.UserService" />

<!-- 声明cacheManager -->
<bean id="cacheManager" class="org.springframework.data.redis.cache.RedisCacheManager"
c:template-ref="redisTemplate" />

<!-- redis 相关配置 -->
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxIdle" value="300" />
<property name="maxWaitMillis" value="3000" />
<property name="testOnBorrow" value="true" />
</bean>
<bean id="jedisConnectionFactory"
class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:host-name="192.168.1.90" p:port="6379" p:pool-config-ref="jedisPoolConfig"
p:database="0" p:use-pool="true" />

<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"
p:connection-factory-ref="jedisConnectionFactory" />
</beans>

参考文章：

1.Spring Cache注解+Redis