在测试项目中引入了memcached作为缓存层，以下是memcached的缓存配置和调用过程。
- linux下memcached安装过程
直接参考以前的博文linux下安装memcached过程 不再详细介绍
- java客户端访问memcached的jar包
在2.6及以前版本使用的是java_memcached-release_2.6.3.jar，3.0以上版本使用memcached-Java-Client-3.0.2.jar，下载地址为http://mvnrepository.com/artifact/com.whalin/Memcached-Java-Client。这两个版本差异较大，官方说法是由于danga的域名不属于他们所有，所以现在修改了类包名称。这是官方的wiki有相关的解释：https://github.com/gwhalin/Memcached-Java-Client/wiki
- memcached-Java-Client的依赖包
memcached-Java-Client-3.0.2.jar 需要以下一些包，
1、commons-pool2-2.4.1.jar依赖包，下载地址http://mvnrepository.com/artifact/org.apache.commons/commons-pool2
2、junit
3、slf4j
- application-Context.xml中 配置支持memcached
<bean id="memcachedPool" class="com.schooner.MemCached.SchoonerSockIOPool"
factory-method="getInstance" init-method="initialize">
<constructor-arg>
<value>neeaMemcachedPool</value>
</constructor-arg>
<property name="servers">
<list>
<value>memcached安装的服务器ip地址:memcached的监听端口</value>
</list>
</property>
<property name="initConn">
<value>20</value>
</property>
<property name="minConn">
<value>10</value>
</property>
<property name="maxConn">
<value>50</value>
</property>
<property name="nagle">
<value>false</value>
</property>
<property name="socketTO">
<value>3000</value>
</property>
</bean> <bean id="memcachedClient" class="com.whalin.MemCached.MemCachedClient">
<constructor-arg>
<value>neeaMemcachedPool</value>
</constructor-arg>
</bean>
- memcached操作类
public class Memcached {
static MemCachedClient cachedClient;
private Memcached(){
}
public static void init()
{
ApplicationContext ctx = new FileSystemXmlApplicationContext("classpath:setup/applicationContext.xml");
cachedClient = (MemCachedClient)ctx.getBean("memcachedClient");
}
public static Object get(String key) {
return cachedClient.get(key);
}
public static boolean add(String key, Object value) {
return cachedClient.add(key, value);
}
public static boolean add(String key, Object value, Integer expire) {
return cachedClient.add(key, value, expire);
}
public static boolean set(String key, Object value) {
return cachedClient.set(key, value);
}
public static boolean set(String key, Object value, Integer expire) {
return cachedClient.set(key, value, expire);
}
public static boolean replace(String key, Object value) {
return cachedClient.replace(key, value);
}
public static boolean replace(String key, Object value, Integer expire) {
return cachedClient.replace(key, value, expire);
}
public static boolean delete(String key){
return cachedClient.delete(key);
}
}
- 调用测试
Memcached.set("memcached", "测试");
System.out.println("memcached缓存————————="+ Memcached.get("memcached"));