jvm一级缓存

1、利用JVM缓存。脱离redis。

2、导包，springboot自带此包。如没有可以导：com.google.guava:guava:20.0的包。

3、直接上代码：

package com.leo.cache;import com.alibaba.fastjson.JSONObject;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import lombok.SneakyThrows;
import org.springframework.stereotype.Component;import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;/*** @author Leo*/
@Component
public class JvmLruOneCacheComponent {Cache<String, String> allCache;@PostConstructpublic void initCache() {allCache = CacheBuilder.newBuilder().weakValues()最大容量.maximumSize(10L)//多少分钟后没有访问的数据会被清除.expireAfterAccess(30L, TimeUnit.MINUTES)// 设置并发级别为cpu核心数.concurrencyLevel(Runtime.getRuntime().availableProcessors() * 2).build();}public Map<String, String> getCache() {return allCache.asMap();}@SneakyThrowspublic List<StockCrawlingResponseDto> getStockCrawlingList() {String key = "xxxxxxx";//先获取缓存。没有缓存就从后面的方法获取数据并存入缓存String jsonStr = allCache.get(key, () -> JSONObject.toJSONString(xxxxService.getData()));return JSONObject.parseArray(jsonStr, xxxdto.class);}public String getCacheByKey(String key) {return allCache.getIfPresent(key);}public void setCacheByKey(String key, String value) {allCache.put(key, value);}public void deleteAllCache() {allCache.invalidateAll();}public void deleteCache(String key) {allCache.invalidate(key);}
}