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