教你一步步搭建ssm框架,第六步之EhCache缓存 - 2018
原创    java_world    发表于:2018-06-07 15:59:00
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上一步:教你一步步搭建ssm框架,第五步之分页插件pagehelper - 2018

合适的使用缓存可有效的提高系统的性能

pom.xml添加ehcache依赖

<dependency>
	<groupId>net.sf.ehcache</groupId>
	<artifactId>ehcache-core</artifactId>
	<version>2.5.2</version>
</dependency>

classpath目录下spring目录下新增cache_spring.xml

<?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:p="http://www.springframework.org/schema/p"
    xmlns:cache="http://www.springframework.org/schema/cache"
	xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="
			http://www.springframework.org/schema/cache
			http://www.springframework.org/schema/cache/spring-cache-4.0.xsd
			http://www.springframework.org/schema/aop
			http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
			http://www.springframework.org/schema/tx 
			http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
			http://www.springframework.org/schema/beans
		    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
			http://www.springframework.org/schema/context 
			http://www.springframework.org/schema/context/spring-context-4.0.xsd
			http://www.springframework.org/schema/jee 
			http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
			http://www.springframework.org/schema/mvc
			http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
	
	<bean id="springCacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
        <property name="cacheManager" ref="ehcacheManager"/>
    </bean>

    <!--ehcache-->
    <bean id="ehcacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
        <property name="configLocation" value="classpath:ehcache.xml"/>
    </bean>
    
	
</beans>

spring_context.xml下导入cache_spring.xml

<!-- spring ehcache -->
<import resource="spring/cache_spring.xml" />

classpath下新增ehcache.xml

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="ehcache.xsd"
         updateCheck="true" monitoring="autodetect"
         dynamicConfig="true">

	<!-- 用户主目录/appEhCacheDir  -->
    <diskStore path="user.home/appEhCacheDir"/>
    
    <!-- 默认缓存 
    
        缓存中的最大数目
    	硬盘最大缓存个数 ,0不限制
    	对象是否永久有效,一但设置了,timeout将不起作用
    	是否保存到磁盘,当系统当机时
    	缓存区大小
    	先进先出
    	是否缓存虚拟机重启期数据,保证缓存在重启后依然有效
    -->
     <cache name="appDefault"
           maxEntriesLocalHeap="1024"  	
           maxEntriesLocalDisk="0" 			
           eternal="true"					
           overflowToDisk="true"			
           diskSpoolBufferSizeMB="20"		
           memoryStoreEvictionPolicy="FIFO"	
           diskPersistent="true"			
            />
            
    
</ehcache>

创建缓存工具类EhCacheUtil.java

package com.faceghost.app.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.Cache;
import org.springframework.cache.ehcache.EhCacheCacheManager;
import org.springframework.stereotype.Component;

/**
 * ehcache 缓存工具类
 * 
 * @author 
 *
 */
@Component
public class EhCacheUtil {

	@Autowired()
	private EhCacheCacheManager ehCacheCacheManager;
	
	/**
	 * classpath 下 ehcache.xml 
	 */
	private static final String defautCache = "appDefault";
	
	public Cache getDefault() {
		return  ehCacheCacheManager.getCache(defautCache);
	}
	
}

测试

package com.faceghost.app.utils;

import org.springframework.cache.Cache;
import org.springframework.cache.Cache.ValueWrapper;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class EhCacheUtilTest {
	static AbstractApplicationContext context = null;
	
	private static void before() {
		context =  new ClassPathXmlApplicationContext("spring_context.xml");
	}
	
	private static void after() {
		context.close();
	}
	
	
	private static void test() {
		EhCacheUtil cacheUtil = context.getBean(EhCacheUtil.class);
		System.err.println(cacheUtil);
		Cache cache = cacheUtil.getDefault();
		cache.put("test","我是缓存");
		ValueWrapper vw =  cache.get("test");
		System.err.println(vw.get());
		
	}
	
	public static void main(String[] args) {
		before();
		test();
		after();
	}
}

github地址: https://github.com/FaceGhost/Simple-SSM

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