ehcache 缓存
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>
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>
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);
- }
- }
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());
- }
- }
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