ehcache 缓存使用

 一：详细配置步骤

     1，添加ehcache.xml文件

      将ehcache.xml文件添加到src路径下面。ehcache.xml文件内容如下

<ehcache>
    <diskStore path="java.io.tempdir" />
    <defaultCache maxElementsInMemory="1000" eternal="false"
        timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" />
    <cache name="ehcacheName" maxElementsInMemory="10000"
        eternal="false" timeToIdleSeconds="300000" timeToLiveSeconds="600000"
        overflowToDisk="true" />
</ehcache>

<ehcache>
	<diskStore path="java.io.tempdir" />
	<defaultCache maxElementsInMemory="1000" eternal="false"
		timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" />
	<cache name="ehcacheName" maxElementsInMemory="10000"
		eternal="false" timeToIdleSeconds="300000" timeToLiveSeconds="600000"
		overflowToDisk="true" />
</ehcache>

     2，添加spring配置文件

     在applicContext.xml文件中添加

   <bean id="cacheManagerFactory"
    class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
    p:configLocation="classpath:ehcache.xml"></bean>

<!-- 声明cacheManager -->
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager"
    p:cacheManager-ref="cacheManagerFactory" ></bean>

    <bean id="cacheManagerFactory"
		class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
		p:configLocation="classpath:ehcache.xml"></bean>
&lt;!-- 声明cacheManager --&gt;
&lt;bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager" 
	p:cacheManager-ref="cacheManagerFactory" &gt;&lt;/bean&gt;</pre><br>




二：使用
     1，定义EHCache工具方法
     
public class EHCache {
    private static final CacheManager cacheManager = new CacheManager();
    private Cache cache;
    public EHCacheService(){
        this.cache=cacheManager.getCache("ehcacheName")
    }

    public Cache getCache() {
        return cache;
    }

    public void setCache(Cache cache) {
        this.cache = cache;
    }



        /*
     * 通过名称从缓存中获取数据
     */
    public Object getCacheElement(String cacheKey) throws Exception {
            net.sf.ehcache.Element e = cache.get(cacheKey);
        if (e == null) {
            return null;
        }
        return e.getValue();
    }
    /*
     * 将对象添加到缓存中
     */
    public void addToCache(String cacheKey, Object result) throws Exception {
        Element element = new Element(cacheKey, result);
        cache.put(element);
    }


}
public class EHCache {
	private static final CacheManager cacheManager = new CacheManager();
	private Cache cache;
	public EHCacheService(){
		this.cache=cacheManager.getCache("ehcacheName")
	}
public Cache getCache() {
	return cache;
}

public void setCache(Cache cache) {
	this.cache = cache;
}



    /*
 * 通过名称从缓存中获取数据
 */
public Object getCacheElement(String cacheKey) throws Exception {
        net.sf.ehcache.Element e = cache.get(cacheKey);
	if (e == null) {
		return null;
	}
	return e.getValue();
}
/*
 * 将对象添加到缓存中
 */
public void addToCache(String cacheKey, Object result) throws Exception {
	Element element = new Element(cacheKey, result);
	cache.put(element);
}

}

    

      2，测试
      
public class Test{
    EHCache ehCache = new EHCache();
    public void Test(){
        //测试将json对象存入缓存中
        JSONObject obj = new JSONObject();
        obj.put("name","lsz");
        ehCache.addToCache("cache_json",obj);

        //从缓存中获取
        JSONObject getobj = (JSONObject)ehCache.getCacheElement("cache_json");
        System.out.println(getobj.toString());
    }
}
public class Test{
	EHCache ehCache = new EHCache();
	public void Test(){
		//测试将json对象存入缓存中
		JSONObject obj = new JSONObject();
		obj.put("name","lsz");
		ehCache.addToCache("cache_json",obj);
	//从缓存中获取
	JSONObject getobj = (JSONObject)ehCache.getCacheElement("cache_json");
	System.out.println(getobj.toString());
}

}





三：问题解决
      1，框架环境是自己搭建的，添加ehcache后运行出错：
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/cache]

Offending resource: class path resource [applicationContext.xml]
     
      出现这种问题，原因是因为在applicationContext.xml文件中 多加了 
    <cache:annotation-driven cache-manager="cacheManager" /> 将其去掉即可



     2，框架需要添加jar包
     spring-context-support-3.2.0.RELEASE.jar
     spring-context-3.2.0.RELEASE.jar