spring boot使用redis实现排名

逃离我推掉我的手 2022-04-03 15:40 190阅读 0赞

redis 五大类型中的sort set来实现排名

pom.xml

<dependency>
                <groupId>redis.clients</groupId>
                <artifactId>jedis</artifactId>
                <version>2.8.2</version>
            </dependency>

由于我redis没有密码，所以下面jedispool没有配置密码，有密码的在new JedisPool(.....,'password')加上后面的密码

package com.example.demo;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.cache.annotation.CachingConfigurerSupport;
    import org.springframework.cache.annotation.EnableCaching;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import redis.clients.jedis.JedisPool;
    import redis.clients.jedis.JedisPoolConfig;
    
    /**
     * 类名：RedisCacheConfiguration<br>
     * 描述：<br>
     * 创建人：<br>
     * 创建时间：2016/9/6 17:33<br>
     *
     * @version v1.0
     */
    
    @Configuration
    @EnableCaching
    public class RedisCacheConfiguration extends CachingConfigurerSupport {
        Logger logger = LoggerFactory.getLogger(RedisCacheConfiguration.class);
    
        @Value("${spring.redis.host}")
        private String host;
    
        @Value("${spring.redis.port}")
        private int port;
    
        @Value("${spring.redis.timeout}")
        private int timeout;
    
        @Value("${spring.redis.pool.max-idle}")
        private int maxIdle;
    
        @Value("${spring.redis.pool.max-wait}")
        private long maxWaitMillis;
    
        @Value("${spring.redis.password}")
        private String password;
    
        @Bean
        public JedisPool redisPoolFactory() {
            logger.info("JedisPool注入成功！！");
            logger.info("redis地址：" + host + ":" + port);
            JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
            jedisPoolConfig.setMaxIdle(maxIdle);
            jedisPoolConfig.setMaxWaitMillis(maxWaitMillis);
    
            JedisPool jedisPool = new JedisPool(jedisPoolConfig, host, port, timeout);
    
            return jedisPool;
        }
    
    }

测试类

package com.example.demo;
    
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    import org.springframework.util.StringUtils;
    import redis.clients.jedis.Jedis;
    import redis.clients.jedis.JedisPool;
    
    import java.util.Iterator;
    import java.util.Optional;
    import java.util.Set;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class DemoApplicationTests {
    
    	@Autowired
    	JedisPool jedisPool;
    
    	private static final String key="top_thing";
    
    
    	@Test
    	public void c(){
    
    		Jedis jedis=jedisPool.getResource();
    		jedis.del(key);
    		for(int i=0;i<20;i++){
    			jedis.zincrby(key,1.0D,i+"");
    		}
    		jedis.zincrby(key,1.0D,18+"");
    		jedis.zincrby(key,2.0D,19+"");
    		//jedis.zremrangeByRank(key,10,-1);
    		Set set=jedis.zrevrange(key,0,-1);
    		Iterator iterator=set.iterator();
    		while(iterator.hasNext()){
    			System.out.println(iterator.next());
    		}
    	}
    
    	@Test
    	public void r(){
    		Jedis jedis=jedisPool.getResource();
    		jedis.del(key);
    	}
    
    }

其中jedis.zincrby为key设置分数值

jedis.zremrangeByRank这个是将排名10到（-1是最后）的去掉

jedis.zrevrange实现set的从大到小排序

jedis命令：[https://www.cnblogs.com/anny-1980/p/4583806.html][https_www.cnblogs.com_anny-1980_p_4583806.html]

[https_www.cnblogs.com_anny-1980_p_4583806.html]: https://www.cnblogs.com/anny-1980/p/4583806.html