2019獨角獸企業重金招聘Python工程師標準>>>

1，SpringBoot版本

2.0.3.RELEASE

①，pom.xml

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.3.RELEASE</version><relativePath /> <!-- lookup parent from repository --></parent><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-cache</artifactId></dependency><dependency><groupId>net.sf.ehcache</groupId><artifactId>ehcache</artifactId></dependency></dependencies>

②，application.properties

spring.cache.ehcache.config=classpath:/ehcache.xml

③，啟用緩存注解

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cache.annotation.EnableCaching;@SpringBootApplication //啟用緩存注解 @EnableCaching public class SpringbootEhcacheApplication {public static void main(String[] args) {SpringApplication.run(SpringbootEhcacheApplication.class, args);} }

④，springboot為我們注入的緩存先關類

@Configuration @ConditionalOnClass({ Cache.class, EhCacheCacheManager.class }) @ConditionalOnMissingBean(org.springframework.cache.CacheManager.class) @Conditional({ CacheCondition.class,EhCacheCacheConfiguration.ConfigAvailableCondition.class }) class EhCacheCacheConfiguration {private final CacheProperties cacheProperties;private final CacheManagerCustomizers customizers;EhCacheCacheConfiguration(CacheProperties cacheProperties,CacheManagerCustomizers customizers) {this.cacheProperties = cacheProperties;this.customizers = customizers;} //緩存管理器@Beanpublic EhCacheCacheManager cacheManager(CacheManager ehCacheCacheManager) {return this.customizers.customize(new EhCacheCacheManager(ehCacheCacheManager));}@Bean@ConditionalOnMissingBeanpublic CacheManager ehCacheCacheManager() {Resource location = this.cacheProperties.resolveConfigLocation(this.cacheProperties.getEhcache().getConfig());if (location != null) {return EhCacheManagerUtils.buildCacheManager(location);}return EhCacheManagerUtils.buildCacheManager();}static class ConfigAvailableCondition extends ResourceCondition {ConfigAvailableCondition() {super("EhCache", "spring.cache.ehcache.config", "classpath:/ehcache.xml");}}}

⑤，類路徑下的ehcache.xml

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"><!--將緩存保存到硬盤的那個位置 --><diskStore path="d:/ehcache/"></diskStore><!-- <diskStore path="java.io.tmpdir"></diskStore>java.io.tmpdir取值：操作系統不同 這個系統屬性所表示的目錄也不同On Windows: java.io.tmpdir:[C:\Users\liyhu\AppData\Local\Temp\]On Solaris: java.io.tmpdir:[/var/tmp/]On Linux: java.io.tmpdir: [/tmp]On Mac OS X: java.io.tmpdir: [/tmp]--><!--指定緩存名 --><cache name="home"eternal="false"maxEntriesLocalHeap="0"timeToIdleSeconds="200"diskPersistent="true"/><!-- eternal：true表示對象永不過期，此時會忽略timeToIdleSeconds和timeToLiveSeconds屬性，默認為false --><!-- maxEntriesLocalHeap：堆內存中最大緩存對象數，0沒有限制 --><!-- timeToIdleSeconds： 設定允許對象處于空閑狀態的最長時間，以秒為單位。當對象自從最近一次被訪問后，如果處于空閑狀態的時間超過了timeToIdleSeconds屬性值，這個對象就會過期，EHCache將把它從緩存中清空。只有當eternal屬性為false，該屬性才有效。如果該屬性值為0，則表示對象可以無限期地處于空閑狀態 --><!-- diskPersistent：是否在磁盤上持久化。指重啟jvm后，數據是否有效。默認為false。 --><!-- memoryStoreEvictionPolicy：如果內存中數據超過內存限制，向磁盤緩存時的策略。默認值LRU，可選FIFO、LFU。--></ehcache>

2，使用緩存

import org.springframework.beans.factory.annotation.Autowired; import org.springframework.cache.Cache.ValueWrapper; import org.springframework.cache.annotation.CacheConfig; import org.springframework.cache.annotation.Cacheable; import org.springframework.cache.ehcache.EhCacheCacheManager; import org.springframework.stereotype.Service;import com.example.demo.bean.Person;@Service @CacheConfig(cacheNames = "home") public class HomeService { //注入緩存管理器@AutowiredEhCacheCacheManager cacheManager; //使用注解緩存，key默認為入參@Cacheable()public String find(Person person) {person.getAge();System.out.println("service 進來了。。。");return "service find====";}//手動使用緩存public String get(Integer age) { //查找指定緩存homeorg.springframework.cache.Cache cache = cacheManager.getCache("home"); //根據key查找是否有緩存該值ValueWrapper val = cache.get(age);if(val!=null) {System.out.println("有緩存。。。");return val.get().toString();}else {System.out.println("沒有緩存。。。");cache.put(age, age);return age.toString();}}

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轉載于:https://my.oschina.net/u/3574106/blog/1835380

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