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　　阅读本文的前提是，你已经安装或者使用了MemCached，或具有相关的基本知识。

　　今天要介绍的是Simple-Spring-Memcached，它封装了对MemCached的调用，使MemCached的客户端开发变得超乎寻常的简单，只要一行代码就行：

　　@ReadThroughAssignCache(assignedKey = "VETS", expiration = 300, namespace = "NELZ")

　　是不是很神奇？这行代码指定了MemCached的key，过期时间和命名空间。假设你的MemCached服务器IP是：196.168.10.101，端口是：12000，那么在数据调用的配置文件中只要加上下面配置代码就可以了：

<import resource="classpath:simplesm-context.xml" />

<bean id="memcachedConnectionBean" class="net.nelz.simplesm.config.MemcachedConnectionBean">

<property name=&quot;consistentHashing" value="true" />

<property name="nodeList&quot; value="196.168.10.101:12000" />

</bean>

从simplesm-context.xml的内容中，可以看出它所封装的类和方法：

<bean id="memcachedClientFactory" class="net.nelz.simplesm.config.MemcachedClientFactory" >

<property name="bean" ref="memcachedConnectionBean" />

</bean>

<bean id="memcachedClient" factory-bean="memcachedClientFactory" factory-method="createMemcachedClient" />

&lt;bean id="methodStore" class="net.nelz.simplesm.aop.CacheKeyMethodStoreImpl" />

&lt;bean id="net.nelz.simplesm.DefaultKeyProvider" class="net.nelz.simplesm.impl.DefaultKeyProvider">

<property name="methodStore" ref="methodStore"; />

</bean>

<bean id="readThroughSingleCache" class="net.nelz.simplesm.aop.ReadThroughSingleCacheAdvice">

<property name="cache&quot; ref="memcachedClient" />

<property name="methodStore" ref=";methodStore" />

<property name="defaultKeyProvider&quot; ref="net.nelz.simplesm.DefaultKeyProvider" />

</bean>

<bean id="readThroughMultiCache" class="net.nelz.simplesm.aop.ReadThroughMultiCacheAdvice">

<property name=&quot;cache" ref="memcachedClient" />

<property name="methodStore" ref="methodStore" />

<property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />

</bean>

<bean id="readThroughAssignCache" class=";net.nelz.simplesm.aop.ReadThroughAssignCacheAdvice">

<property name="cache" ref="memcachedClient" /&gt;

<property name="methodStore" ref=&quot;methodStore" />

<property name="defaultKeyProvider" ref=&quot;net.nelz.simplesm.DefaultKeyProvider" />

</bean>

<bean id="updateSingleCache" class="net.nelz.simplesm.aop.UpdateSingleCacheAdvice">

<property name="cache" ref="memcachedClient" />

<property name="methodStore&quot; ref="methodStore" />;

<property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />

</bean>

<bean id="updateMultiCache" class="net.nelz.simplesm.aop.UpdateMultiCacheAdvice">

<property name="cache" ref="memcachedClient" />

&lt;property name=&quot;methodStore" ref="methodStore" />

<property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider&quot; />

</bean>

<bean id="updateAssignCache" class="net.nelz.simplesm.aop.UpdateAssignCacheAdvice">

<property name="cache" ref="memcachedClient" />

<property name="methodStore" ref="methodStore&quot; />

<property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />

</bean>

<bean id="invalidateSingleCache" class="net.nelz.simplesm.aop.InvalidateSingleCacheAdvice">

<property name="cache" ref="memcachedClient" />

<property name="methodStore" ref="methodStore" />

<property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />

</bean>

<bean id="invalidateMultiCache" class="net.nelz.simplesm.aop.InvalidateMultiCacheAdvice&quot;>

<property name="cache" ref="memcachedClient&quot; />

<property name="methodStore" ref="methodStore&quot; />

<property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />

</bean>

<bean id="invalidateAssignCache" class="net.nelz.simplesm.aop.InvalidateAssignCacheAdvice">

<property name="cache" ref=";memcachedClient&quot; />

<property name="methodStore" ref="methodStore" />

<property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />

</bean>

Simple-Spring-Memcached还提供了一个例子，在spring的petClinic例子中加入了几行代码，就实现了对MemCached的调用：

import net.nelz.simplesm.annotations.ReadThroughAssignCache;

import net.nelz.simplesm.annotations.ReadThroughSingleCache;

@ReadThroughAssignCache(assignedKey = "VETS", expiration = 300, namespace = &quot;NELZ")

public Collection<Vet> getVets() {

System.out.println("\n ! ! !Gonna wait a bit: &quot; + new Date() + "\n");try {

Thread.sleep(4000);

} catch (Exception ex) {}

return sessionFactory.getCurrentSession().createQuery("from Vet vet order by vet.lastName, vet.firstName").list();

}