ehcache的使用 Shiro与Ehcache的结合（附：EhcacheUtils）

ehcache 缓存的使用

合理的使用缓存会极大的提高程序的运行效率。切记：缓存请勿滥用。

配置ehcache与Shiro

shiro初识请查看该文章
https://blog.csdn.net/pyfysf/article/details/81952889

一、导入ehcache的依赖

     
        <dependency>
            <groupId>net.sf.ehcachegroupId>
            <artifactId>ehcacheartifactId>
            <version>2.6.7version>
            <type>pomtype>
        dependency>

二、创建ehcache.xml配置文件

简洁版

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../config/ehcache.xsd">

    
    <diskStore path="java.io.tmpdir"/>


    
    <defaultCache
            maxElementsInMemory="10000"
            eternal="false"
            timeToIdleSeconds="120"
            timeToLiveSeconds="120"
            overflowToDisk="true"
            maxElementsOnDisk="10000000"
            diskPersistent="false"
            diskExpiryThreadIntervalSeconds="120"
            memoryStoreEvictionPolicy="LRU"
            />



        <cache 
        name="ehcacheName"
        maxElementsInMemory="10000"
        eternal="false" 
        timeToIdleSeconds="300000" 
        timeToLiveSeconds="600000"
        overflowToDisk="true" />

    
    <cache name="sysCache" maxEntriesLocalHeap="100" eternal="true" overflowToDisk="true"/>

ehcache>

注释版

"http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../config/ehcache.xsd">

    
    
    "java.io.tmpdir"/>

    

    

    


    


    
    
    "10000"
            eternal="false"
            timeToIdleSeconds="120"
            timeToLiveSeconds="120"
            overflowToDisk="true"
            maxElementsOnDisk="10000000"
            diskPersistent="false"
            diskExpiryThreadIntervalSeconds="120"
            memoryStoreEvictionPolicy="LRU"
            />


        "ehcacheName"
        maxElementsInMemory="10000"
        eternal="false" 
        timeToIdleSeconds="300000" 
        timeToLiveSeconds="600000"
        overflowToDisk="true" />

    
    "sysCache" maxEntriesLocalHeap="100" eternal="true" overflowToDisk="true"/>

三、配置ehcacheManager与shiro进行结合

    
    <bean id="cacheManager" class="org.apache.shiro.cache.ehcache.EhCacheManager">
        
        <property name="cacheManagerConfigFile" value="classpath:ehcache.xml">property>
    bean>


    
    <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
        <property name="realm" ref="myRealm"/>
        <property name="cacheManager" ref="cacheManager"/>
    bean>

---

附录(EhcacheUtils)：

/**
 * Cache工具类
 */
public class CacheUtils {

    private static CacheManager cacheManager;

    private static final String SYS_CACHE = "sysCache";

    public final static Byte[] locks = new Byte[0];

    /**
     * 获取SYS_CACHE缓存
     *
     * @param key
     * @return
     */
    public static Object get(String key) {
        return get(SYS_CACHE, key);
    }

    /**
     * 写入SYS_CACHE缓存
     *
     * @param key
     * @return
     */
    public static void put(String key, Object value) {
        put(SYS_CACHE, key, value);
    }

    /**
     * @param key
     * @return
     */
    public static void remove(String key) {
        remove(SYS_CACHE, key);
    }

    /**
     * 获取缓存
     *
     * @param cacheName
     * @param key
     * @return
     */
    public static Object get(String cacheName, String key) {
        Element element = getCache(cacheName).get(key);
        return element == null ? null : element.getObjectValue();
    }

    /**
     * 写入缓存
     *
     * @param cacheName
     * @param key
     * @param value
     */
    public static void put(String cacheName, String key, Object value) {
        Element element = new Element(key, value);
        getCache(cacheName).put(element);
    }

    /**
     * 从缓存中移除
     *
     * @param cacheName
     * @param key
     */
    public static void remove(String cacheName, String key) {
        getCache(cacheName).remove(key);
    }

    public static void removeAll(String cacheName) {
        getCache(cacheName).removeAll();
    }

    /**
     * @param cacheName
     * @return
     */
    private static Cache getCache(String cacheName) {
        if (cacheManager == null) {
            synchronized (locks) {
                if (cacheManager == null) {
                    cacheManager = ((CacheManager) SpringContextUtil.getBean("cacheManager"));
                }
            }
        }
        Cache cache = cacheManager.getCache(cacheName);
        if (cache == null) {
            cacheManager.addCache(cacheName);
            cache = cacheManager.getCache(cacheName);
            cache.getCacheConfiguration().setEternal(true);
        }
        return cache;
    }

    public static CacheManager getCacheManager() {
        return cacheManager;
    }

}