简单使用redis-zset实现排行榜

此方法实现一个根据某字段的查询次数进行排行，查询的次数越多排行越前（从大到小排序），适用于初学者

1.添加依赖

		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

2.注入RedisTemplate方法

@Autowired
public RedisTemplate redisTemplate;

3.创建对象，用来接收redis数据

@Data
public class RangeVo implements Serializable {
     

    private String shopName;

    private Double shopPrice;
    
}

4.添加十条redis数据

 @Test
    public void getzset4(){
     

        String keyModel = "testList";
        for (int i = 0; i < 10 ; i++) {
     
            int score = new Random().nextInt(50);
            String ss = "shop"+i;
            redisTemplate.opsForZSet().add(keyModel,ss,score);
        }
    }

5.根据某个key查询并每次查询score都会加1

@Test
    public void setOneValue(){
     
        String keyModel = "testList";
        String ss = "shop8";

        Double aDouble = redisTemplate.opsForZSet().incrementScore(keyModel, ss, 1);

        System.out.println(aDouble);
    }

6.查询redis中所有数据，zset会根据score自动排序

@Test
    public void getList(){
     

        String key = "testList";

        List<RangeVo> list = new ArrayList<>();
        /** 从小到大排序 返回value 和 score* 参数注释 key 为有序集合的key，1，50 是分数范围 1-50，0 是偏移量即从哪条数据开始排序， 5是取5条满足条件的数据*/
        Set<ZSetOperations.TypedTuple<Object>> set = redisTemplate.opsForZSet().rangeByScoreWithScores(key,1,50,0,5);
        Iterator<ZSetOperations.TypedTuple<Object>> iterator = set.iterator();
        while (iterator.hasNext()){
     
            ZSetOperations.TypedTuple<Object> next = iterator.next();
            RangeVo rangeVo = new RangeVo();
            rangeVo.setShopName((String) next.getValue());
            rangeVo.setShopPrice(next.getScore());
            list.add(rangeVo);
        }

        System.out.println(list);
    }