Java连接Redis常用操作

Posted 2020-11-23 亚图姆

1.去重

package Data;

import redis.clients.jedis.Jedis;

public class TestRedisUniq {
    public static Jedis jd = new Jedis("localhost", 6379);

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        jd.sadd("uniqset", "aa");
        jd.sadd("uniqset", "a1");
        jd.sadd("uniqset", "aa");
        jd.sadd("uniqset", "a2");
        jd.sadd("uniqset", "aa");
        jd.sadd("uniqset", "a2");
        System.out.println(jd.smembers("uniqset"));
    }
}

运行结果：

 

 

 2.获取前n名数据

package Data;

import redis.clients.jedis.Jedis;

public class TestRedisTopN {
    public static Jedis jd = new Jedis("localhost", 6379);

    public static void main(String[] args) {
        jd.zadd("topn", 1, "m1");
        jd.zadd("topn", 2, "m2");
        jd.zadd("topn", 11, "m3");
        jd.zadd("topn", 12, "m4");
        jd.zadd("topn", 14, "m5");
        jd.zadd("topn", 15, "m6");
        jd.zadd("topn", 151, "m1");
        jd.zadd("topn", 66, "m2");
        jd.zadd("topn", 3, "m7");
        //获取前5名
        System.out.println(jd.zrevrange("topn", 0, 4));
    }
}

运行结果：

 

 3.获取后n条数据

import redis.clients.jedis.Jedis;

public class TestRedisLastN {
    public static Jedis jd = new Jedis("localhost", 6379);

    public static void main(String[] args) {
        jd.del("nlist");
        lpush("nlist", "a1");
        lpush("nlist", "a2");
        lpush("nlist", "a3");
        lpush("nlist", "a4");
        lpush("nlist", "a5");
        System.out.println(queryTop100("nlist"));
    }

    public static void lpush(String key, String value) {
        jd.lpush(key, value);
        jd.ltrim(key, 0, 2);
    }

    public static List<String> queryTop100(String key) {
        return jd.lrange(key, 0, 2);
    }
}

运行结果：

 

 4.实现队列

package Data;

import redis.clients.jedis.Jedis;

public class TestRedisQueue {
    public static Jedis jd = new Jedis("localhost", 6379);

    public static void main(String[] args) {
        jd.del("queueList");
        jd.rpush("queueList", "1");
        jd.rpush("queueList", "2");
        jd.lpop("queueList");
        System.out.println(jd.lrange("queueList", 0, -1));
    }
}