简述
- 上一文中简述了使用StringRedisTemplate操作redis中的hash类型,今天来记录一下操作set类型的主要方法
代码
@RunWith(SpringRunner.class)
@SpringBootTest
public class SetDemo {
@Autowired
private StringRedisTemplate redisTemplate;
@Test
public void demo1() {
//集合中添加元素,返回添加个数
redisTemplate.opsForSet().add("games", "鬼泣", "古墓丽影", "仙剑奇侠传", "LOL", "DOTA自走棋");
printSet("games");
}
@Test
public void demo2() {
//从集合中删除指定元素
redisTemplate.opsForSet().remove("games", "鬼泣");
printSet("games");
}
@Test
public void demo3() {
//从集合中随机删除一个元素,并返回该元素
String item = redisTemplate.opsForSet().pop("games");
System.out.println(item);
printSet("games");
}
@Test
public void demo4() {
//将集合1中的指定元素移到集合2
redisTemplate.opsForSet().move("games", "仙剑奇侠传", "chinese-games");
//打印集合1
printSet("games");
//打印集合2
printSet("chinese-games");
}
@Test
public void demo5() {
//获得集合大小
Long size = redisTemplate.opsForSet().size("games");
printSet("games");
System.out.println(size);
}
@Test
public void demo6() {
//判断集合中是否存在某元素
Boolean ifExist = redisTemplate.opsForSet().isMember("games", "LOL");
System.out.println(ifExist);
}
@Test
public void demo7() {
//添加集合a
redisTemplate.opsForSet().add("set-a", "a", "b", "c", "d");
//添加集合b
redisTemplate.opsForSet().add("set-b", "a", "b");
//求交集
Set<String> intersection = redisTemplate.opsForSet().intersect("set-a", "set-b");
//也可以和多个key对应的集合求交集 Set<V> intersect(K key, K otherKey);
System.out.println(intersection);
}
@Test
public void demo8() {
//添加集合a
redisTemplate.opsForSet().add("set-a", "a", "b", "c", "d");
//添加集合b
redisTemplate.opsForSet().add("set-b", "a", "b");
//求交集并放入集合c
redisTemplate.opsForSet().intersectAndStore("set-a", "set-b", "set-c");
//也可以和多个key对应的集合求交集 Long intersectAndStore(K key, Collection<K> otherKeys, K destKey);
//打印集合c
printSet("set-c");
}
@Test
public void demo9() {
//添加集合m
redisTemplate.opsForSet().add("set-m", "a", "b", "c", "d");
//添加集合n
redisTemplate.opsForSet().add("set-n", "c", "d", "e", "f");
//求并集
Set<String> union = redisTemplate.opsForSet().union("set-m", "set-n");
System.out.println(union);
//其他操作与intersect类似 如和多个key求并集,求并集并放入集合等
}
@Test
public void demo10() {
//添加集合d
redisTemplate.opsForSet().add("set-d", "a", "b", "c", "d");
//添加集合e
redisTemplate.opsForSet().add("set-e", "c", "d", "e", "f");
//添加集合f
redisTemplate.opsForSet().add("set-f", "e", "f", "g", "h");
//求差集(属于d不属于e和f)
Set<String> difference = redisTemplate.opsForSet().difference("set-d", Arrays.asList("set-e", "set-f"));
System.out.println(difference);
//其他操作与交集并集类似
}
@Test
public void demo11() {
//随机获取集合中的一个元素
System.out.println(redisTemplate.opsForSet().randomMember("games"));
//随机获取集合中指定个数的元素(有可能重复)
System.out.println(redisTemplate.opsForSet().randomMembers("games", 10));
//随机获取集合中指定个数的元素(不重复)
System.out.println(redisTemplate.opsForSet().distinctRandomMembers("games", 10));
}
/**
* 打印集合
* @date 2019年2月12日
* @author baipengfei
* @param key
*/
private void printSet(String key) {
//获取所有成员
Set<String> members = redisTemplate.opsForSet().members(key);
System.out.println(members);
}
}
网友评论