springboot在redis里存放list并获取指定value

@Autowired
private StringRedisTemplate redisTemplate;

@Test
    public void testRedisList() {
        redisTemplate.opsForList().rightPush("list", "one");
        redisTemplate.opsForList().rightPush("list", "two");
        redisTemplate.opsForList().rightPush("list", "three");
        redisTemplate.opsForList().rightPush("list", "four");
        List<String> list4 = redisTemplate.opsForList().range("list4", 0, -1);
        System.out.println(redisTemplate.opsForList().index("list", 0));
        System.out.println(redisTemplate.opsForList().index("list", 1));
        System.out.println(redisTemplate.opsForList().index("list", 2));
        System.out.println(redisTemplate.opsForList().index("list", 3));
        System.out.println(redisTemplate.opsForList().index("list", 4));
        System.out.println(redisTemplate.opsForList().index("list", -1));
    }

输出

one

two

three

four

null

four

index(K key, long index)

 获取集合指定位置的值。

index("list", -1)获取的是最后一个value，index不存在输出null