版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/woshimuyi1025/article/details/61197582
1、pom文件引用:
<!--ehcache 相关包 -->
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.7.5</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>3.2.8.RELEASE</version>
</dependency>
2、在resource目录配置applicationContext-ehcache.xml和ehcache.xml
applicationContext-ehcache.xml配置:
<?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:aop="http://www.springframework.org/schema/aop" xmlns:c="http://www.springframework.org/schema/c"
xmlns:cache="http://www.springframework.org/schema/cache" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:lang="http://www.springframework.org/schema/lang" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p" xmlns:task="http://www.springframework.org/schema/task"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
<!-- 开启spring缓存 -->
<bean id="ehCacheManager"
class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
<property name="configLocation" value="classpath:/ehcache.xml" />
<property name="shared" value="true" />
</bean>
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
<property name="cacheManager" ref="ehCacheManager" />
</bean>
<cache:annotation-driven cache-manager="cacheManager" />
</beans>
ehcache.xml代码:
<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">
<diskStore path="${java.io.tmpdir}/${system.project_name}/cache" />
<cache name="userCache" maxElementsInMemory="500" timeToIdleSeconds="36000" timeToLiveSeconds="86400" eternal="false" overflowToDisk="false" />
<!--
name:Cache的唯一标识
maxElementsInMemory:内存中最大缓存对象数
maxElementsOnDisk:磁盘中最大缓存对象数,若是0表示无穷大
eternal:Element是否永久有效,一但设置了,timeout将不起作用
overflowToDisk:配置此属性,当内存中Element数量达到maxElementsInMemory时,Ehcache将会Element写到磁盘中
timeToIdleSeconds:设置Element在失效前的允许闲置时间。仅当element不是永久有效时使用,可选属性,默认值是0,也就是可闲置时间无穷大
timeToLiveSeconds:设置Element在失效前允许存活时间。最大时间介于创建时间和失效时间之间。仅当element不是永久有效时使用,默认是0.,也就是element存活时间无穷大
diskPersistent:是否缓存虚拟机重启期数据
diskExpiryThreadIntervalSeconds:磁盘失效线程运行时间间隔,默认是120秒
diskSpoolBufferSizeMB:这个参数设置DiskStore(磁盘缓存)的缓存区大小。默认是30MB。每个Cache都应该有自己的一个缓冲区
memoryStoreEvictionPolicy:当达到maxElementsInMemory限制时,Ehcache将会根据指定的策略去清理内存。默认策略是LRU(最近最少使用)。你可以设置为FIFO(先进先出)
或是LFU(较少使用)
-->
</ehcache>
3、web.xml配置:
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1" metadata-complete="true">
<!-- 修改servlet版本为3.1 -->
<!-- 配置DispatcherServlet -->
<servlet>
<servlet-name>niming</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置springMVC需要加载的配置文件
spring-dao.xml,spring-service.xml,spring-web.xml
Mybatis - > spring -> springmvc
-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring-*.xml;
classpath:applicationContext-ehcache.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>niming</servlet-name>
<!-- 默认匹配所有的请求 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
4、使用案例:
package com.niming.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.niming.dao.UserDao;
import com.niming.entity.User;
import com.niming.service.UserService;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.Element;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
private static final CacheManager cacheManager = CacheManager.create();
public void insertUser(User user) {
userDao.insertUser(user);
}
public User queryUserById(String openid){
User user = null;
String key = "user/"+openid;
Ehcache cache = cacheManager.getEhcache("userCache");
Element element = cache.get(key);
if(element!=null){
user = (User)element.getObjectValue();
}else{
user = userDao.queryUserById(openid);
cache.put(new Element(key, user));
}
return user;
}
}