1.set

1. An unordered and unique set of string elements

sadd key member1 [member2]: add multiple members

Scar key: count members

sdiff key1 [key2]: find out the difference set of two sets, the members that key2 does not have in key1
sidffstore des key1 [key2]: save the difference set to the des set

Single key1 [key2]: find the intersection of two sets

sismember key member: judge whether member is a member of key

smembers key: return all members

smove src des member: move member from set src to des

Pop key: randomly pop up a member

srandmember key [count]: returns one or more members randomly. Count is the total number of returned members.

srem key member1 [member2]: remove members

Union key1 [key2]: Union

2. In java program

		// Set the RedisTemplate value serializer to StringRedisSerializer to test the snippet
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
		RedisTemplate redisTemplate = applicationContext.getBean(RedisTemplate.class);
		Set set = null;
		// Add element to list
		redisTemplate.boundSetOps("set1").add("v1", "v2", "v3", "v4", "v5", "v6");
		redisTemplate.boundSetOps("set2").add("v0", "v2", "v4", "v6", "v8");
		
		// Find the set length
		redisTemplate.opsForSet().size("set1");
		
		// Difference set
		set = redisTemplate.opsForSet().difference("set1", "set2");
		
		// Seeking Union
		set = redisTemplate.opsForSet().intersect("set1", "set2");
		
		// Determine whether the elements in the collection
		boolean exists = redisTemplate.opsForSet().isMember("set1", "v1");
		
		// Get all elements of the collection
		set = redisTemplate.opsForSet().members("set1");
		
		// Pop an element at random from the collection
		String val = (String) redisTemplate.opsForSet().pop("set1");
		
		// Get elements of a collection at random
		val = (String) redisTemplate.opsForSet().randomMember("set1");		
		// Get elements of 2 sets at random
		List list = redisTemplate.opsForSet().randomMembers("set1", 2L);
		
		// Delete the elements of a collection. The parameters can be multiple
		redisTemplate.opsForSet().remove("set1", "v1");
		
		// Find the union of two sets
		redisTemplate.opsForSet().union("set1", "set2");
		
		// Find the difference set of two sets and save it to the set diff set
		redisTemplate.opsForSet().differenceAndStore("set1", "set2", "diff_set");
		// Find the intersection of two sets and save it to the set inter set
		redisTemplate.opsForSet().intersectAndStore("set1", "set2", "inter_set");
		// Find the union of two sets, and save it to the union set.
		redisTemplate.opsForSet().unionAndStore("set1", "set2", "union_set");