如何使用redisson客户端获取redis集群中key的值 ?

Config config = new Config();
        config.useClusterServers()      
    .addNodeAddress("redis://localhost:6380","redis://localhost:6379","redis://localhost:6381");

        RedissonClient redisson = Redisson.create(config);

        RMapCache<String, String>     map = redisson.getMapCache("db0");

        System.out.println("Key value  is :  "+    map.get("key"));
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