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JavaWeb项目缓存从 ehcache 切换到 redis

热度:56   发布时间:2023-12-16 08:52:59.0

JavaWeb项目缓存从 ehcache 切换到 redis

由于项目一直用 ehcache 作为缓存,不过相对于 redisehcache 的缓存实现依赖于 jvm,若想与其他语言的项目交互,恐怕会吃不少苦头。

pom.xml 依赖

<dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>2.5.1</version>
</dependency>
<dependency><groupId>commons-pool</groupId><artifactId>commons-pool</artifactId><version>1.6</version>
</dependency>
<dependency><groupId>org.springframework.data</groupId><artifactId>spring-data-redis</artifactId><version>1.3.4.RELEASE</version>
</dependency>

新建接口

ICacheManager.class

public interface ICacheManager {
    <T extends Object> T get(String cacheName, Object key);void put(String cacheName, Object key, Object value);void remove(String cacheName, Object key);void removeAll(String cacheName);
}

redis 实现

RedisCacheManagerImpl.class

import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.data.redis.cache.RedisCacheManager;/*** Created by qyvlik on 2017/6/26.*/
public class RedisCacheManagerImpl implements ICacheManager {
    // 见下文配置文件public final static RedisCacheManager redisCacheManager = SpringContextHolder.getBean("redisCacheManager");protected static CacheManager getCacheManager() {return redisCacheManager;}@Overridepublic <T extends Object> T get(String cacheName, Object key) {Cache cache = getCacheManager().getCache(cacheName);Cache.ValueWrapper valueWrapper = cache.get(key);return (T) valueWrapper.get();}@Overridepublic void put(String cacheName, Object key, Object value) {Cache cache = getCacheManager().getCache(cacheName);cache.put(key, value);}@Overridepublic void remove(String cacheName, Object key) {Cache cache = getCacheManager().getCache(cacheName);cache.evict(key);}@Overridepublic void removeAll(String cacheName) {Cache cache = getCacheManager().getCache(cacheName);cache.clear();}
}

spring-redis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns="http://www.springframework.org/schema/beans" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd"><description>Jedis Configuration</description><bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig"><property name="maxIdle" value="300"/><!-- 最大能够保持idel状态的对象数 --><property name="maxTotal" value="60000"/><!-- 最大分配的对象数 --><property name="testOnBorrow" value="true"/><!-- 当调用borrow Object方法时,是否进行有效性检查 --></bean><bean id="redisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"><property name="hostName" value="127.0.0.1"/>  <!-- 这里填写 redis IP --><property name="port" value="6379"/><property name="usePool" value="true"/><property name="poolConfig" ref="jedisPoolConfig"/></bean><bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"><property name="connectionFactory" ref="redisConnectionFactory"/></bean><bean id="redisCacheManager" class="org.springframework.data.redis.cache.RedisCacheManager"><constructor-arg index="0" ref="redisTemplate"/></bean>
</beans>

注意,这里是单机版的 redis 配置,主从配置,请自行查找

ehcache 实现

EhCacheManagerImpl.class

import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;/*** Created by qyvlik on 2017/6/26.*/
public class EhCacheManagerImpl implements ICacheManager {
    // 见下文配置文件public final static CacheManager cacheManager = SpringContextHolder.getBean("cacheManager");protected static CacheManager getCacheManager() {return cacheManager;}/*** 获得一个Cache,没有则创建一个。** @param cacheName* @return*/private static synchronized Cache getCache(String cacheName) {Cache cache = getCacheManager().getCache(cacheName);if (cache == null) {getCacheManager().addCache(cacheName);cache = getCacheManager().getCache(cacheName);cache.getCacheConfiguration().setEternal(true);}return cache;}@Overridepublic <T extends Object> T get(String cacheName, Object key) {Element element = getCache(cacheName).get(key);return element == null ? null : (T) element.getObjectValue();}@Overridepublic void put(String cacheName, Object key, Object value) {Element element = new Element(key, value);getCache(cacheName).put(element);}@Overridepublic void remove(String cacheName, Object key) {getCache(cacheName).remove(key);}@Overridepublic void removeAll(String cacheName) {Cache cache = getCacheManager().getCache(cacheName);cache.removeAll(true);}
}

ehcache.xml

<?xml version="1.0" encoding="UTF-8"?>
<ehcache updateCheck="false" name="defaultCache"><diskStore path="java.io.tmpdir/otc"/><!-- 默认缓存配置. --><defaultCache maxEntriesLocalHeap="100" eternal="false" timeToIdleSeconds="300" timeToLiveSeconds="600"overflowToDisk="true" maxEntriesLocalDisk="100000"/>
</ehcache>

注意,这里是单机版的 ehcache 配置,集群配置,请自行查找

SpringContextHolder.class

package com.rich.common.utils;import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;/*** 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext.*/
@Service
@Lazy(false)
public class SpringContextHolder implements ApplicationContextAware, DisposableBean {
    private static ApplicationContext applicationContext = null;private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);/*** 取得存储在静态变量中的ApplicationContext.*/public static ApplicationContext getApplicationContext() {assertContextInjected();return applicationContext;}/*** 实现ApplicationContextAware接口, 注入Context到静态变量中.*/@Overridepublic void setApplicationContext(ApplicationContext applicationContext) {SpringContextHolder.applicationContext = 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) {assertContextInjected();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.*/public static <T> T getBean(Class<T> requiredType) {assertContextInjected();return applicationContext.getBean(requiredType);}/*** 清除SpringContextHolder中的ApplicationContext为Null.*/public static void clearHolder() {if (logger.isDebugEnabled()) {logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);}applicationContext = null;}/*** 检查ApplicationContext不为空.*/private static void assertContextInjected() {Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");}/*** 实现DisposableBean接口, 在Context关闭时清理静态变量.*/@Overridepublic void destroy() throws Exception {SpringContextHolder.clearHolder();}
}

Spring 整合Redis 出现 afterPropertiesSet signature: ()V) Incompatible argument to function 解决办法

Caused by: java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool

使用Spring Data + Redis实现缓存