目录

前言:

实现示例:

讲解:

前言:

实现示例:

public class ThirdPartyApi {
    public static String getData(String param) {
        // 第三方接口调用代码
        return "data from third party api";
    }
}

public class CacheUtil {
    private static final long CACHE_TIME = 60 * 60 * 1000; // 缓存时间为1个小时
    private static Map<String, CacheData> cacheMap = new ConcurrentHashMap<>();

    public static String getDataFromCache(String param) {
        CacheData cacheData = cacheMap.get(param);
        if (cacheData != null && System.currentTimeMillis() - cacheData.getTimestamp() <= CACHE_TIME) {
            // 缓存未过期，返回缓存数据
            return cacheData.getData();
        } else {
            // 缓存已过期或不存在，查询第三方接口并更新缓存
            String data = ThirdPartyApi.getData(param);
            cacheMap.put(param, new CacheData(data, System.currentTimeMillis()));
            return data;
        }
    }

    private static class CacheData {
        private String data;
        private long timestamp;

        public CacheData(String data, long timestamp) {
            this.data = data;
            this.timestamp = timestamp;
        }

        public String getData() {
            return data;
        }

        public long getTimestamp() {
            return timestamp;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        String param = "test";
        String data = CacheUtil.getDataFromCache(param);
        System.out.println(data);
    }
}

讲解: