新闻浏览机制

/**
 * @ClassName NewsDemo
 * @Desciption 新闻浏览机制
 * @Author MaRui
 * @Date 2021/8/30 10:37
 * @Version 1.0
 */
public class NewsDemo {

    private static Jedis jedis = new Jedis("127.0.0.1", 6379);

    public static void main(String[] args) {
        NewsDemo demo = new NewsDemo();

        for (int i = 0; i < 20; i++) {
            demo.addNews(i + 1, i + 1);
        }

        long maxTimestamp = 18;
        long minTimestamp = 2;
        int pageNo = 1;
        int pageSize = 10;
        int startIndex = (pageNo - 1) * pageSize;
        Set<Tuple> searchResult = demo.searchNews(maxTimestamp, minTimestamp, startIndex, pageSize);
        System.out.println("搜索指定时间范围：" + searchResult);
    }

    /**
     * 加入一篇新闻
     * @param newsId
     */
    public void addNews(long newsId, long timestamp) {
        jedis.zadd("news", timestamp, String.valueOf(newsId));
    }

    /**
     * 搜索新闻
     * @param maxTimestamp
     * @param minTimestamp
     * @param index
     * @param count
     * @return
     */
    public Set<Tuple> searchNews(long maxTimestamp, long minTimestamp, int index, int count) {
        return jedis.zrevrangeByScoreWithScores("news", maxTimestamp, minTimestamp, index, count);
    }
}