1.pom中插入依賴：

<!--guava緩存cache-->
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>23.5-jre</version>
        </dependency>

2.在com.example.mapper.mybatisMap建立一個包cache，在cache下建立一個類LocalCache：

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import java.util.concurrent.TimeUnit;

public class LocalCache {
    private static Cache<String, Integer> cache = CacheBuilder.newBuilder()
            .expireAfterWrite(10L, TimeUnit.MINUTES)  //寫入10分鐘後過期
            .maximumSize(
 
50000L)
            .build();

    public Integer getCache(String key){
        return (Integer)cache.getIfPresent(key);
    }

    public Cache<String, Integer> getCache(){
        return cache;
    }

    public void setCache(String key, Integer obj){
        cache.put(key, obj);
    }

    public
 
 void removeCache(String key){
        cache.invalidate(key);
    }

    public void removeAll(){
        cache.invalidateAll();
    }

    public long getSize(){
        return cache.size();
    }


}

spring boot使用guava緩存