guava cache基本用法

package com.pjk.demo;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.TimeUnit;

/**
 * @author PJK
 */
@Slf4j
public class DemoGuavaCache {
    public static void main(String[] args) {
//        创建一个cache实例
        Cache cache = CacheBuilder.newBuilder()
                //最大缓存大小
                .maximumSize(100)
                //写入后的过期时间
                .expireAfterWrite(10, TimeUnit.MINUTES)
                .build();

        cache.put("name", "zhangsan");
        String cacheValue = cache.getIfPresent("name");
        log.info("name缓存对应的值为：{}", cacheValue);

        String cacheAge = cache.getIfPresent("age");
        log.info("第一次查询age缓存对应的值为：{}", cacheAge);
        if (cacheAge == null) {
            //缓存中没有这个key  应该去查询这个key的值 然后添加到缓存中
            cache.put("age", "18");
            cacheAge = cache.getIfPresent("age");
            log.info("第二次查询age缓存对应的值为：{}", cacheAge);
        }
    }
}

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.concurrent.TimeUnit;

public class DemoCache {
    private static Cache cache1 = CacheBuilder.newBuilder()
            .maximumSize(100000)
            .expireAfterWrite(10, TimeUnit.MINUTES)
            .build();
    private static Cache cache2 = CacheBuilder.newBuilder()
            .maximumSize(100000)
            .expireAfterWrite(10, TimeUnit.MINUTES)
        服务器托管网    .build();
    private static Cache cache3 = CacheBuilder.newBuilder()
            .maximumSize(100000)
            .expireAfterWrite(10, TimeUnit.MINUTES)
            .build();

    public static void main(String[] args) {
        // 存储数据到缓存中
        for (int i = 1; i  cache, String key, String value) {
        cache.put(key, value);
    }

    public static String getData(Cache cache, String key) {
        return cache.getIfPresent(key);
    }

    public static void saveToMySQL(String key1, String key2, String key3, String value1, String value2, String value3) {
        try (Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
             PreparedStatement statement = connection.prepareStatement("INSERT INTO mytable (key1, key2, key3, value1, value2, value3) VALUES (?, ?, ?, ?, ?, ?)")) {

            statement.setString(1, key1);
            statement.setString(2, key2);
            statement.setString(3, key3);
            statement.setStr服务器托管网ing(4, value1);
            statement.setString(5, value2);
            statement.setString(6, value3);

            statement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}