Spring与Redis的整合

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第一步：引入jar包

需要引入和Redis 相关的两个jar包，一个是spring-data-redis.jar,另一个是jedis.jar。

具体的jar包在maven中心库里面都能找到。

maven项目pom.xml的配置：

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<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>1.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.5.2</version>
</dependency>

第二步：新建RedisCache.class类，自定义Cache。

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package com.qcjy.common.cache;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.apache.log4j.Logger;
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;
/**
* 自定义cache,可以定义一个cache名称和一个缓存失效时间。时间到期会自动更新。在xml中配置。
* <功能详细描述>
*
* @author lcma
* @version [版本号, 2016年9月12日]
* @see [相关类/方法]
* @since [产品/模块版本]
*/
public class RedisCache implements Cache {
/**
* LOG日志
*/
private static final Logger LOGGER = Logger.getLogger(RedisCache.class);
private RedisTemplate<String, Object> redisTemplate;
/**
* 缓存名称
*/
private String name;
/**
* 缓存失效时间，时间到了会自动更新
*/
private long liveTime = 0;
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;
}
/**
* 获取
*/
@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;
}
/**
* 新建
*/
@Override
public void put(Object key, Object value) {
final String keyf = (String)key;
final Object valuef = value;
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 (getLiveTime() > 0) {
connection.expire(keyb, getLiveTime());
}
return 1L;
}
});
}
/**
* 删除
*/
@Override
public void clear() {
redisTemplate.execute(new RedisCallback<String>() {
public String doInRedis(RedisConnection connection)
throws DataAccessException {
connection.flushDb();
return "ok";
}
});
}
/**
* 描述 : <Object转byte[]>.
*
* <使用方法说明>
*
*
* @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) {
LOGGER.error(ex.getMessage(),ex);
}
return bytes;
}
/**
* 描述 : <byte[]转Object>.
*
* <使用方法说明>
*
*
* @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) {
LOGGER.error(ex.getMessage(),ex);
} catch (ClassNotFoundException ex) {
LOGGER.error(ex.getMessage(),ex);
}
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 <T> T get(Object key, Class<T> type) {
return null;
}
@Override
public ValueWrapper putIfAbsent(Object key, Object value) {
return null;
}
public long getLiveTime() {
return liveTime;
}
public void setLiveTime(long liveTime) {
this.liveTime = liveTime;
}
}

第三步：新建spring-redis.xml，配置Redis相关信息。

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:cache="http://www.springframework.org/schema/cache" xmlns:c="http://www.springframework.org/schema/c"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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">
<cache:annotation-driven cache-manager="cacheManager" />
<bean id="jedisConnectionFactory"
class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:host-name="127.0.0.1" p:port="6379" p:password="123456" />
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"
p:connection-factory-ref="jedisConnectionFactory" />
<bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
<property name="caches">
<set>
<bean class="com.qcjy.common.cache.RedisCache">
<property name="redisTemplate" ref="redisTemplate" />
<property name="name" value="shortTimeCache" />
<property name="liveTime" value="3600" />
</bean>
<bean class="com.qcjy.common.cache.RedisCache">
<property name="redisTemplate" ref="redisTemplate" />
<property name="name" value="longTimeCache" />
<property name="liveTime" value="14400" />
</bean>
<bean class="com.qcjy.common.cache.RedisCache">
<property name="redisTemplate" ref="redisTemplate" />
<property name="name" value="nerverTimeCache" />
<property name="liveTime" value="0" />
</bean>
</set>
</property>
</bean>
</beans>

com.qcjy.common.cache.RedisCache 是我的项目自定义cache的类路径，可根据自己项目类路径变换。

第四步：在spring配置文件中引入导入上面的redis缓存配置

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<import resource="spring-redis.xml" />

第五步：在方法上面添加注解

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/**
* getProject:根据id获取数据.
* @author lcma
* @param id
* @return
* @since JDK 1.7
*/
@Override
@Cacheable(value = "shortTimeCache", key = "'getProject'+#id")
public Project getProject(String id) {
return projectDao.getById(id);
}

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