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：
1 <import resource="classpath:simplesm-context.xml" /> 2 3 4 5 <bean id="memcachedConnectionBean" class="net.nelz.simplesm.config.MemcachedConnectionBean"> 6 7 <property name="consistentHashing" value="true" /> 8 9 <property name="nodeList" value="196.168.10.101:12000" />10 11 </bean>
从simplesm-context.xml的内容中，可以看出它所封装的类和方法：
1 <bean id="memcachedClientFactory" class="net.nelz.simplesm.config.MemcachedClientFactory" > 2 3 <property name="bean" ref="memcachedConnectionBean" /> 4 5 </bean> 6 7 8 9 <bean id="memcachedClient" factory-bean="memcachedClientFactory" factory-method="createMemcachedClient" /> 10 11 12 13 <bean id="methodStore" class="net.nelz.simplesm.aop.CacheKeyMethodStoreImpl" /> 14 15 16 17 <bean id="net.nelz.simplesm.DefaultKeyProvider" class="net.nelz.simplesm.impl.DefaultKeyProvider"> 18 19 <property name="methodStore" ref="methodStore" /> 20 21 </bean> 22 23 24 25 <bean id="readThroughSingleCache" class="net.nelz.simplesm.aop.ReadThroughSingleCacheAdvice"> 26 27 <property name="cache" ref="memcachedClient" /> 28 29 <property name="methodStore" ref="methodStore" /> 30 31 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" /> 32 33 </bean> 34 35 <bean id="readThroughMultiCache" class="net.nelz.simplesm.aop.ReadThroughMultiCacheAdvice"> 36 37 <property name="cache" ref="memcachedClient" /> 38 39 <property name="methodStore" ref="methodStore" /> 40 41 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" /> 42 43 </bean> 44 45 <bean id="readThroughAssignCache" class="net.nelz.simplesm.aop.ReadThroughAssignCacheAdvice"> 46 47 <property name="cache" ref="memcachedClient" /> 48 49 <property name="methodStore" ref="methodStore" /> 50 51 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" /> 52 53 </bean> 54 55 <bean id="updateSingleCache" class="net.nelz.simplesm.aop.UpdateSingleCacheAdvice"> 56 57 <property name="cache" ref="memcachedClient" /> 58 59 <property name="methodStore" ref="methodStore" /> 60 61 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" /> 62 63 </bean> 64 65 <bean id="updateMultiCache" class="net.nelz.simplesm.aop.UpdateMultiCacheAdvice"> 66 67 <property name="cache" ref="memcachedClient" /> 68 69 <property name="methodStore" ref="methodStore" /> 70 71 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" /> 72 73 </bean> 74 75 <bean id="updateAssignCache" class="net.nelz.simplesm.aop.UpdateAssignCacheAdvice"> 76 77 <property name="cache" ref="memcachedClient" /> 78 79 <property name="methodStore" ref="methodStore" /> 80 81 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" /> 82 83 </bean> 84 85 <bean id="invalidateSingleCache" class="net.nelz.simplesm.aop.InvalidateSingleCacheAdvice"> 86 87 <property name="cache" ref="memcachedClient" /> 88 89 <property name="methodStore" ref="methodStore" /> 90 91 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" /> 92 93 </bean> 94 95 <bean id="invalidateMultiCache" class="net.nelz.simplesm.aop.InvalidateMultiCacheAdvice"> 96 97 <property name="cache" ref="memcachedClient" /> 98 99 <property name="methodStore" ref="methodStore" />100 101 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />102 103 </bean>104 105 <bean id="invalidateAssignCache" class="net.nelz.simplesm.aop.InvalidateAssignCacheAdvice">106 107 <property name="cache" ref="memcachedClient" />108 109 <property name="methodStore" ref="methodStore" />110 111 <property name="defaultKeyProvider" ref="net.nelz.simplesm.DefaultKeyProvider" />112 113 </bean>114 115
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：
1 import net.nelz.simplesm.annotations.ReadThroughAssignCache; 2 3 import net.nelz.simplesm.annotations.ReadThroughSingleCache; 4 5 @ReadThroughAssignCache(assignedKey = "VETS", expiration = 300, namespace = "NELZ") 6 7 public Collection<Vet> getVets() { 8 9 System.out.println("\n ! ! !Gonna wait a bit: " + new Date() + "\n"); 10 11 try {12 13 Thread.sleep(4000);14 15 } catch (Exception ex) {}16 17 return sessionFactory.getCurrentSession().createQuery("from Vet vet order by vet.lastName, vet.firstName").list();18 19 }20 21
为了加强测试的效果，在第一次读取数据时，故意停顿了一下(sleep)。
夜深了，大家也应该sleep了吧：）
来源：https://www.cnblogs.com/chrischen662/archive/2010/09/15/1826397.html