Java本地缓存实现代码示例

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import java.util.concurrent.ExecutionException;
public class GuavaCacheExample {
    private static final LoadingCache<String, String> CACHE = CacheBuilder.newBuilder()
            .maximumSize(100) // 设置缓存最大容量为100
            .build(new CacheLoader<String, String>() {
                @Override
                public String load(String key) throws Exception {
                    // 从数据库中查询数据并返回
                    return queryDataFromDatabase(key);
                }
            });
    public static void main(String[] args) throws Exception {
        // 从缓存中获取数据
        String data = CACHE.get("key");
        System.out.println(data);
    }
}

import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import java.util.concurrent.TimeUnit;
public class CaffeineExample {
    private static final Cache<String, String> CACHE = Caffeine.newBuilder()
            .maximumSize(100) // 设置缓存最大容量为100
            .expireAfterWrite(10, TimeUnit.MINUTES) // 设置缓存过期时间为10分钟
            .build();
    public static void main(String[] args) throws Exception {
        // 从缓存中获取数据
        String data = CACHE.get("key", new Callable<String>() {
            @Override
            public String call() throws Exception {
                // 从数据库中查询数据并返回
                return queryDataFromDatabase("key");
            }
        });
        System.out.println(data);
    }
}

import org.ehcache.Cache;
import org.ehcache.CacheManager;
import org.ehcache.config.Builder;
import org.ehcache.config.Configuration;
import org.ehcache.config.units.MemoryUnit;
public class EncahcheExample {
    private static final Cache<String, String> CACHE = CacheManager.create()
            .newCache("myCache", new Configuration()
                    .withSizeOfMaxObjectSize(1024 * 1024) // 设置缓存最大容量为1MB
                    .withExpiry(10, TimeUnit.MINUTES)) // 设置缓存过期时间为10分钟
            .build();
    public static void main(String[] args) throws Exception {
        // 从缓存中获取数据
        String data = CACHE.get("key");
        System.out.println(data);
    }
}