Redis的Zset在排行榜中应用

1.在pom文件导入：

java 复制代码

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

2.yml文件配置

java 复制代码

  redis:
    port: 6379
    host: localhost
    database: 5

3.代码：

java 复制代码

import java.util.Set;

@RestController
    @RequestMapping("/leaderboard")
    public class  testController {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 增加玩家分数
     * @param player
     * @param score
     */
     @PostMapping("/add")
    public void addPlayerScore(String player, double score) {
        stringRedisTemplate.opsForZSet().add("playerRanking", player, score);
    }

    /**
     * 获取前N名玩家排名
     * @param topN
     * @return
     */
    @GetMapping("/top")
    public Set<ZSetOperations.TypedTuple<String>> getPlayerRanking(int topN) {
        return stringRedisTemplate.opsForZSet().reverseRangeWithScores("playerRanking", 0, topN - 1);
    }

    /**
     * 获取玩家排名
     * @param player
     * @return
     */
    @GetMapping("/rank")
    public Long getPlayerRank(String player) {
        return stringRedisTemplate.opsForZSet().reverseRank("playerRanking", player) + 1;
    }


    /**
     * 对应的加分操作
     */
    @GetMapping("/increment")
    public void incrementScore(String player,double socre){
        stringRedisTemplate.opsForZSet().incrementScore("playerRanking",player,socre);
    }
}

4.插入数据：

java 复制代码

@SpringBootTest
public class test {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Test
    public void batchAddPlayers() {
        Random random = new Random();

        for (int i = 1; i <= 20; i++) {
            String player = "Player" + i; 
            double score = random.nextDouble() * 100; 
            stringRedisTemplate.opsForZSet().incrementScore("playerRanking",player,score);

        }
    }
}

5.结果：

![请添加图片描述](https://i-blog.csdnimg.cn/direct/ad2fa7880deb4f69a6754979711db20f.png