添加依赖

<!--开启 cache 缓存 -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<!-- ehcache 缓存 -->
<dependency>
	<groupId>net.sf.ehcache</groupId>
	<artifactId>ehcache</artifactId>
</dependency>

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">
    <!-- 磁盘缓存位置 -->
    <diskStore path="java.io.tmpdir/ehcache"/>

    <!-- 默认缓存 -->
    <defaultCache
            eternal="false"
            maxElementsInMemory="1000"
            overflowToDisk="false"
            diskPersistent="false"
            timeToIdleSeconds="0"
            timeToLiveSeconds="120"
            memoryStoreEvictionPolicy="LRU"/>

</ehcache>

缓存管理类

import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.Element;

public class EhcacheManager {

    private static final String CACHE_NAME = "keda-cache";

    private static Ehcache getEhcache () {
        CacheManager cacheManager = CacheManager.getInstance();
        return cacheManager.addCacheIfAbsent(CACHE_NAME);
    }

    public static void put (Object key, Object value) {
        Ehcache ehcache = getEhcache();
        ehcache.putIfAbsent(new Element(key, value));
    }

    public static Object get (Object key) {
        Ehcache ehcache = getEhcache();
        Element element = ehcache.get(key);
        if (element != null) {
            return element.getObjectValue();
        }
        return null;
    }

}