<!-- 应用程序Spring上下文配置 --><context-param><param-name>contextConfigLocation</param-name><param-value>classpath*:applicationContext*.xml,</param-value></context-param>
<!-- 自定义监听器 继承自spring上下文加载监听器 --><listener><listener-class>com.schoolnet.sys.listener.WebContextListener</listener-class></listener>

public class WebContextListener extends org.springframework.web.context.ContextLoaderListener {@Overridepublic WebApplicationContext initWebApplicationContext(ServletContext servletContext) {if (!printKeyLoadMessage()){return null;}return super.initWebApplicationContext(servletContext);}private static boolean printKeyLoadMessage(){StringBuilder sb = new StringBuilder();sb.append("\r\n======================================================================\r\n");sb.append("\r\n    欢迎使用 校园网  - EhCache缓存系统搭建\r\n");sb.append("\r\n======================================================================\r\n");System.out.println(sb.toString());return true;}
}

<!-- 加载配置属性文件 --><bean id="propertyConfigurer"class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"><property name="fileEncoding" value="UTF-8" /><property name="locations"><list><value>classpath:schoolnet.properties</value></list></property></bean>
<!-- 缓存配置 --><bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"><property name="configLocation" value="classpath:${ehcache.configFile}" /></bean>

ehcache.configFile=cache/ehcache.xml(源码包下的cache文件夹中)

<?xml version="1.0" encoding="UTF-8"?>
<ehcache updateCheck="false" name="defaultCache"><diskStore path="../temp/jeesite/ehcache" /><!-- 默认缓存配置. --><defaultCache maxEntriesLocalHeap="100" eternal="false" timeToIdleSeconds="300" timeToLiveSeconds="600"overflowToDisk="true" maxEntriesLocalDisk="100000" /><!-- 系统缓存 --><cache name="sysCache" maxEntriesLocalHeap="100" eternal="true" overflowToDisk="true"/><!-- 用户缓存 --><cache name="userCache" maxEntriesLocalHeap="100" eternal="true" overflowToDisk="true"/><!-- 系统活动会话缓存 --><cache name="activeSessionsCache" maxEntriesLocalHeap="10000" overflowToDisk="true"eternal="true" timeToLiveSeconds="0" timeToIdleSeconds="0"diskPersistent="true" diskExpiryThreadIntervalSeconds="600"/><!-- 简单页面缓存<cache name="SimplePageCachingFilter" maxEntriesLocalHeap="100" eternal="false" overflowToDisk="true"timeToIdleSeconds="120" timeToLiveSeconds="120" memoryStoreEvictionPolicy="LFU"/> --></ehcache>

/*** Cache工具类*/
public class CacheUtils {private static CacheManager cacheManager = ((CacheManager)SpringContext.getBean("cacheManager"));private static final String SYS_CACHE = "sysCache";/*** 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);}/*** 从SYS_CACHE缓存中移除* @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);}/*** 获得一个Cache，没有则创建一个。* @param cacheName* @return*/private static Cache getCache(String cacheName){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;}}
6、SpringContext.java，用类获得ApplicationContext实例@Component
public class SpringContext implements ApplicationContextAware,DisposableBean{private static ApplicationContext applicationContext;/*** 取得存储在静态变量中的ApplicationContext.*/@Overridepublic void setApplicationContext(ApplicationContext context)throws BeansException {try {applicationContext=context;} catch (Exception e) {e.printStackTrace();}}/*** 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(String name){return (T) applicationContext.getBean(name);}public static String[] getBeanNamesForType(Class<?> type){return applicationContext.getBeanNamesForType(type);}/*** 实现DisposableBean接口, 在Context关闭时清理静态变量.*/@Overridepublic void destroy() throws Exception {applicationContext = null;}
}

/*** 用户工具类*/
public class UserUtils {private static UserDao userDao = SpringContextHolder.getBean(UserDao.class);private static Map<String, Object> cacheMap;/*** 根据ID获取用户* @param id* @return 取不到返回null*/public static User getUser(String id){User user = (User)CacheUtils.get("userCache", "id_" + id);if (user ==  null){user = userDao.get(id);if (user == null){return null;}CacheUtils.put("userCache", "id_" + user.getId(), user);CacheUtils.put("userCache", "ln" + user.getLoginName(), user);}return user;}/*** 根据登录名获取用户* @param loginName* @return 取不到返回null*/public static User getByLoginName(String loginName){User user = (User)CacheUtils.get("userCache", "ln" + loginName);if (user == null){user = userDao.getByLoginName(new User(null, loginName));if (user == null){return null;}CacheUtils.put("userCache", "id_" + user.getId(), user);CacheUtils.put("userCache", "ln" + user.getLoginName(), user);}return user;}/*** 清除用户缓存* @param user*/public static void clearCache(User user){CacheUtils.remove("userCache", "id_" + user.getId());CacheUtils.remove("userCache", "ln" + user.getLoginName());CacheUtils.remove("userCache", "ln" + user.getOldLoginName());}
}