Spring Boot Cache使用與整合

參考：

• 史上最全的Spring Boot Cache使用與整合
• Spring Cache擴展：注解失效時間+主動刷新緩存
  • 項目地址

使用本地Caffeine緩存

引入依賴包

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency><groupId>com.github.ben-manes.caffeine</groupId><artifactId>caffeine</artifactId><version>2.6.2</version>
</dependency>

自定義Caffeine配置

• CachingConfig.java

package com.vcredit.vmp.checkcenter.config;
import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.vcredit.vmp.checkcenter.common.properties.CaffeineCacheProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.caffeine.CaffeineCache;
import org.springframework.cache.support.SimpleCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;import java.time.Duration;
import java.util.*;
/*** 緩存配置* @author kancy*/
@Configuration
@EnableCaching
public class CachingConfig {@AutowiredCaffeineCacheProperties caffeineCacheProperties;/*** 創建基于Caffeine的Cache Manager* @return*/@Bean@Primary@ConditionalOnProperty(prefix = "system.cache.caffeine" , name = "enabled", havingValue = "true")public CacheManager caffeineCacheManager() {SimpleCacheManager cacheManager = new SimpleCacheManager();Map<String, CaffeineCache> cacheMap = new HashMap();// 設置全局配置的本地緩存List<String> globalCacheNames = caffeineCacheProperties.getCacheName();if(globalCacheNames !=null && !globalCacheNames.isEmpty()){addCacheObject(cacheMap, globalCacheNames, caffeineCacheProperties.getExpireAfterWrite(),caffeineCacheProperties.getExpireAfterAccess(), caffeineCacheProperties.getMaximumSize());}// 設置自定義屬性緩存, 可以覆蓋全局緩存List<CaffeineCacheProperties.Config> configs = caffeineCacheProperties.getConfigs();if(configs != null && !configs.isEmpty()){for (CaffeineCacheProperties.Config config : configs) {List<String> cacheNames = config.getCacheName();if (cacheNames == null || cacheNames.isEmpty()){continue;}Duration expireAfterWrite = Optional.ofNullable(config.getExpireAfterWrite()).orElse(caffeineCacheProperties.getExpireAfterWrite());Duration expireAfterAccess = Optional.ofNullable(config.getExpireAfterAccess()).orElse(caffeineCacheProperties.getExpireAfterAccess());Long maximumSize = Optional.ofNullable(config.getMaximumSize()).orElse(caffeineCacheProperties.getMaximumSize());addCacheObject(cacheMap, cacheNames, expireAfterWrite, expireAfterAccess, maximumSize);}}// 加入到緩存管理器進行管理cacheManager.setCaches(cacheMap.values());return cacheManager;}private void addCacheObject(Map<String, CaffeineCache> cacheMap, List<String> cacheNames, Duration expireAfterWrite, Duration expireAfterAccess, Long maximumSize) {for (String cacheName : cacheNames) {// spring.cache.caffeine: maximumSize=500,expireAfterAccess=10s,expireAfterWrite=15sCaffeine<Object, Object> recordStats = Caffeine.newBuilder().recordStats().maximumSize(maximumSize);if(expireAfterAccess != null) recordStats.expireAfterAccess(expireAfterAccess);if(expireAfterWrite != null) recordStats.expireAfterWrite(expireAfterWrite);Cache<Object, Object> cache = recordStats.build();CaffeineCache caffeineCache = new CaffeineCache(cacheName,cache);// 覆蓋添加cacheMap.put(cacheName, caffeineCache);}}
}

• CaffeineCacheProperties.java

package com.vcredit.vmp.checkcenter.common.properties;import lombok.Getter;
import lombok.Setter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;import java.time.Duration;
import java.util.List;/*** Caffeine本地緩存自定義配置* @author kancy*/
@Getter
@Setter
@Configuration
@ConfigurationProperties("system.cache.caffeine")
@ConditionalOnProperty(prefix = "system.cache.caffeine" , name = "enabled", havingValue = "true")
public class CaffeineCacheProperties {private List<String> cacheName;private Duration expireAfterWrite;private Duration expireAfterAccess;private Long maximumSize = Long.valueOf(-1);private List<Config> configs;@Getter@Setterpublic static class Config {private List<String> cacheName;Duration expireAfterWrite;Duration expireAfterAccess;Long maximumSize;}
}

• application.yml

system.cache.caffeine:enabled: true# 全局配置cacheName: cache1,cache2,cache3expireAfterWrite: 60sexpireAfterAccess: 30smaximumSize: 500# 自定義配置，cacheName相同可覆蓋全局configs:- cacheName: checkApplyCacheexpireAfterAccess: 10s- cacheName: userQueryCacheexpireAfterAccess: 15s

使用緩存

@Cacheable(value = { "checkApplyCache" }, key="#req.md5")
public Result check(CheckReq req) {// your code...return Result.ok();
}