Memcached之——Spring与Memcached的集成

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这篇文章给大家介绍如何集成spring与Mamcached，以达到系统性能优化的效果

1.安装memcache

1)下载memcached服务端memcached-1.2.6-win32-bin.zip，地址：http://code.jellycan.com/memcached/

2)下载java版客户端 java_memcached-release_2.6.1.zip

3)解压缩memcached-1.2.6-win32-bin.zip到指定目录，例如：D:\memcached-1.2.6-win32 ，

在终端（即cmd命令行界面），执行'D:\memcached-1.2.6-win32\memcached.exe -d install'

安装，再执行：'D:\memcached\memcached.exe -d start'启动,这样memcache就会作为windows系统服务在每 次开机时启动memcache服务。

2. 新建配置文件(spring级别)

新建名为spring-memcache.xml的spring配置文件

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> <bean id="memcachedPool" class="com.danga.MemCached.SockIOPool" factory-method="getInstance" init-method="initialize" destroy-method="shutDown">
<constructor-arg>
<value>neeaMemcachedPool</value>
</constructor-arg>
<property name="servers">
<list>
<value>${memcache.server}</value>
</list>
</property>
<property name="initConn">
<value>${memcache.initConn}</value>
</property>
<property name="minConn">
<value>${memcache.minConn}</value>
</property>
<property name="maxConn">
<value>${memcache.maxConn}</value>
</property>
<property name="maintSleep">
<value>${memcache.maintSleep}</value>
</property>
<property name="nagle">
<value>${memcache.nagle}</value>
</property>
<property name="socketTO">
<value>${memcache.socketTO}</value>
</property>
</bean>
<bean id="memcachedClient" class="com.danga.MemCached.MemCachedClient">
<constructor-arg>
<value>neeaMemcachedPool</value>
</constructor-arg>
</bean>
</beans>

3.Web.xml文件中配置新建的文件

<!-- 配置spring的监听器,加载Spring配置文件-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:/spring/applicationContext-common.xml,classpath:/spring/spring-memcache.xml</param-value>
</context-param>

4. 修改spring配置文件

修改applicationContext-common.xml配置文件。

1).添加properties配置文件（memcache.properties）去配置memcache的属性。

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:memcache.properties</value>
<value>classpath:jdbc.properties</value>
</list>
</property>
</bean>

2).添加bean去初始化我们自己的一个spring工具类，一会进行详细解释

<bean id="springContextHolder" class="com.hxrainbow.crm.util.SpringContextHolder"/>

5. Memcache配置文件

memcache.properties文件内容如下：

mcache.server=127.0.0.1\:11211
memcache.initConn=20
memcache.minConn=10
memcache.maxConn=50
memcache.maintSleep=3000
memcache.nagle=false
memcache.socketTO=3000

6. 获得spring容器的工具类

/**

* 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候中取出ApplicaitonContext.
* @author liuyazhuang
**/

public class SpringContextHolder implements ApplicationContextAware{

private static ApplicationContext applicationContext;

/**

* 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.

*/
public voidsetApplicationContext(ApplicationContext applicationContext) {
SpringContextHolder.applicationContext= applicationContext;
}

/**

* 取得存储在静态变量中的ApplicationContext.

*/
public staticApplicationContext getApplicationContext() {
checkApplicationContext();
return applicationContext;
}

/**

* 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.

*/
@SuppressWarnings("unchecked")
public static<T> T getBean(String name) {
checkApplicationContext();
return (T) applicationContext.getBean(name);
}

/**

* 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.

* 如果有多个Bean符合Class, 取出第一个.

*/
@SuppressWarnings("unchecked")
public static<T> T getBean(Class<T> clazz) {
checkApplicationContext();
Map beanMaps = applicationContext.getBeansOfType(clazz);
if (beanMaps!=null&& !beanMaps.isEmpty()) {
return(T) beanMaps.values().iterator().next();
}else{
return null;
}
}
private static voidcheckApplicationContext() {
if (applicationContext == null) {
throw newIllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder");

}
}
}

下面是这个方法的简单说明：

Set the ApplicationContext that this object runs in.Normally this call will be used to initialize the object.

我们在配置文件中配置了bean的初始化，然后他就可以用于获得spring容器中的东西了。

7.memcache的工具类

/**
* memcache的工具类
* @author liuyazhuang
*/
public class MemcacheUtil {
public static MemCachedClient getMemCachedClient() {
return SpringContextHolder.getBean("memcachedClient");
}
}

8.junit测试类

/**
* 测试类
* @author liuyazhuang
*/
public class MemcacheUtilTest {
static MemCachedClient memcachedClient;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
ApplicationContext ac=new ClassPathXmlApplicationContext(new String[]{"/spring/applicationContext-common.xml","/spring/spring-memcache.xml"});
}
@Test
public void s() {
MemCachedClient m=SpringContextHolder.getBean("memcachedClient");
m.set("name", "liuyazhuang");
System.out.println(m.get("name"));
}
}