△Hollis, 一个对Coding有着独特追求的人△

ApplicationReadyEvent

@EventListener(ApplicationReadyEvent.class)
public void preloadCache() {
    // 在应用启动后执行缓存预热逻辑
    // ...
}

Runner

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class MyCommandLineRunner implements CommandLineRunner {

    @Override
    public void run(String... args) throws Exception {
        // 在应用启动后执行缓存预热逻辑
        // ...
    }
}

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;

@Component
public class MyApplicationRunner implements ApplicationRunner {

    @Override
    public void run(ApplicationArguments args) throws Exception {
        // 在应用启动后执行缓存预热逻辑
        // ...
    }
}

private void callRunners(ApplicationContext context, ApplicationArguments args) {
    List<Object> runners = new ArrayList<>();
    runners.addAll(context.getBeansOfType(ApplicationRunner.class).values());
    runners.addAll(context.getBeansOfType(CommandLineRunner.class).values());
    AnnotationAwareOrderComparator.sort(runners);
    for (Object runner : new LinkedHashSet<>(runners)) {
        if (runner instanceof ApplicationRunner) {
            callRunner((ApplicationRunner) runner, args);
        }
        if (runner instanceof CommandLineRunner) {
            callRunner((CommandLineRunner) runner, args);
        }
    }
}

使用InitializingBean接口

import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;

@Component
public class CachePreloader implements InitializingBean {

    @Override
    public void afterPropertiesSet() throws Exception {
        // 执行缓存预热逻辑
        // ...
    }
}

使用@PostConstruct注解

import javax.annotation.PostConstruct;
import org.springframework.stereotype.Component;

@Component
public class CachePreloader {

    @PostConstruct
    public void preloadCache() {
        // 执行缓存预热逻辑
        // ...
    }
}

@Scheduled(cron = "0 0 1 * * ?") // 每天凌晨1点执行
public void scheduledCachePreload() {
    // 执行缓存预热逻辑
    // ...
}

import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.LoadingCache;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
public class MyCacheService {

    private final LoadingCache<String, String> cache;

    public MyCacheService() {
        this.cache = Caffeine.newBuilder()
                .refreshAfterWrite(1, TimeUnit.MINUTES)  // 配置自动刷新，1分钟刷新一次
                .build(key -> loadDataFromSource(key));  // 使用加载器加载数据
    }

    public String getValue(String key) {
        return cache.get(key);
    }

    private String loadDataFromSource(String key) {
        // 从数据源加载数据的逻辑
        // 这里只是一个示例，实际应用中可能是从数据库、外部服务等获取数据
        System.out.println("Loading data for key: " + key);
        return "Value for " + key;
    }
}