如果只需要在单个应用程序中使用本地缓存，则可以选择Ehcache；它支持内存和磁盘存储，这里不以注解方式演示，通过自己实现缓存管理者灵活控制缓存的读写；
1、引入相关依赖
<!-- ehcache3集成start --><dependency><groupId>org.ehcache</groupId><artifactId>ehcache</artifactId><version>3.10.8</version></dependency><dependency><groupId>javax.cache</groupId><artifactId>cache-api</artifactId></dependency><!-- ehcache3集成end -->2、修改yml配置
spring:cache:type: jcachejcache:config: classpath:cache/ehcache.xml3、配置ehcache.xml文件
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://www.ehcache.org/v3"xsi:schemaLocation="http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd"><!-- 缓存持久化配置: 定义磁盘缓存位置 --><persistence directory="E:/project_home/limit_control/cache/light-element-mybatis"/><!-- 缓存模板: 未填写缓存名时使用的默认缓存，同时也可被继承 --><cache-template name="defaultCache"><key-type>java.lang.String</key-type><value-type>java.lang.Object</value-type><resources><heap unit="MB">64</heap><offheap unit="MB">128</offheap></resources></cache-template><!-- 缓存列表: 自定义缓存配置 --><!-- 不过期 --><cache alias="EXPIRE_NONE" uses-template="defaultCache"/><!-- 24小时过期 --><cache alias="EXPIRE_24_HOURS" uses-template="defaultCache"><expiry><ttl unit="hours">24</ttl></expiry></cache><!-- 30分钟过期 --><cache alias="EXPIRE_30_MINUTES" uses-template="defaultCache"><expiry><ttl unit="minutes">30</ttl></expiry></cache>
</config>4、编写缓存策略枚举
public enum CacheStrategy {EXPIRE_30_MINUTES,EXPIRE_24_HOURS,EXPIRE_NONE
}import com.alibaba.fastjson.JSON;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Configuration;import java.util.List;/*** ehcache3缓存管理者*/
@Configuration
@EnableCaching
public class EhCacheManager {private static CacheManager cacheManager;public EhCacheManager(CacheManager cacheManager) {EhCacheManager.cacheManager = cacheManager;}/*** 获取默认缓存** @return*/public static Cache getDefaultCache() {return getCache("EXPIRE_24_HOURS");}/*** 获取指定缓存** @param cacheName 缓存名称* @return*/public static Cache getCache(String cacheName) {if (cacheManager == null) {return null;}return cacheManager.getCache(cacheName);}/*** 获取缓存内容(对象)** @param cacheName 缓存名称* @param key 键* @param clazz<T> class类型* @return*/public static <T extends Object> T getObjValue(String cacheName, String key, Class<T> clazz) {Object o = getValue(cacheName, key);if (o == null) {return null;}T t = (T) JSON.parseObject(JSON.toJSONString(o), clazz);return t;}/*** 获取缓存内容(集合)** @param cacheName 缓存名称* @param key 键* @param clazz<T> class类型* @return*/public static <T extends Object> List<T> getListValue(String cacheName, String key, Class<T> clazz) {Object o = getValue(cacheName, key);if (o == null) {return null;}List<T> ts = JSON.parseArray(JSON.toJSONString(o), clazz);return ts;}/*** 获取缓存内容** @param cacheName* @param key* @return*/private static Object getValue(String cacheName, String key) {Cache cache = getCache(cacheName);if (cache == null && cache.get(key) == null) {return null;}Cache.ValueWrapper valueWrapper = cache.get(key);if (valueWrapper == null) {return null;}Object o = valueWrapper.get();if (o == null) {return null;}return o;}/*** 新增或修改缓存数据** @param cacheName 缓存名称* @param key 键* @param value 值*/public static void put(String cacheName, String key, Object value) {Cache cache = getCache(cacheName);if (cache == null) {return;}cache.put(key, value);}/*** 删除缓存数据** @param cacheName 缓存名称* @param key 键*/public static void del(String cacheName, String key) {Cache cache = getCache(cacheName);if (cache == null) {return;}cache.evict(key);}
}6、编写controller进行简单测试
import cn.hutool.core.collection.CollectionUtil;
import com.yx.light.element.mybatis.cache.CacheStrategy;
import com.yx.light.element.mybatis.cache.EhCacheManager;
import com.yx.light.element.mybatis.mapper.entity.GroupHeader;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.ArrayList;
import java.util.List;@RestController
@RequestMapping(value = "/index")
@Slf4j
public class IndexController {@GetMapping(value = "/list")public List<GroupHeader> list() {List<GroupHeader> listValue = EhCacheManager.getListValue(CacheStrategy.EXPIRE_30_MINUTES.name(), "list", GroupHeader.class);if (CollectionUtil.isEmpty(listValue)) {log.info("集合缓存不存在或已过期，查询数据库！");//模拟查库List<GroupHeader> objects = new ArrayList<>();for (int i = 0; i < 5; i++) {GroupHeader groupHeader = new GroupHeader();groupHeader.setGroupCode("aaaaa-" + i);groupHeader.setGroupName("多个对象" + i);objects.add(groupHeader);}listValue = objects;EhCacheManager.put(CacheStrategy.EXPIRE_30_MINUTES.name(), "list", listValue);log.info("集合数据加载到缓存！");} else {log.info("从集合缓存中直接获取数据！");}return listValue;}@GetMapping(value = "/one")public GroupHeader one() {GroupHeader objValue = EhCacheManager.getObjValue(CacheStrategy.EXPIRE_30_MINUTES.name(), "obj", GroupHeader.class);if (objValue == null) {log.info("对象缓存不存在或已过期，查询数据库！");//模拟查库GroupHeader groupHeader = new GroupHeader();groupHeader.setGroupCode("aaaaa");groupHeader.setGroupName("单个对象");objValue = groupHeader;EhCacheManager.put(CacheStrategy.EXPIRE_30_MINUTES.name(), "obj", groupHeader);log.info("对象数据加载到缓存！");} else {log.info("从对象缓存中直接获取数据！");}return objValue;}@GetMapping(value = "/del")public void del() {log.info("清理对象缓存！");EhCacheManager.del(CacheStrategy.EXPIRE_30_MINUTES.name(), "obj");}}7、分别调用接口查看日志打印
