Using Jedis to operate Redis

Redis is an open source Key-value data cache, similar to memcached.

Redis has multiple types of value, including string (string), list (linked list), set (set), Zset (sorted set-ordered set), and hash (hash type).

Jedis is the official Redis-Preferred Java client development package.

//to connect Redis, the default port for Redis is 6379Jedis Jedis=NewJedis ("localhost", 6379); //Verify the password if no password is set this code is omittedJedis.auth ("Password"); Jedis.connect ();//ConnectionJedis.disconnect ();//Disconnect ConnectionSet<String> keys = Jedis.keys ("*");//list all the keysSet<String> keys = Jedis.keys ("key");//find a specific key//removes the given key or keys and ignores the command if the key does not exist.Jedis.del ("Key1"); Jedis.del ("Key1", "Key2", "Key3", "Key4", "Key5");//to remove the lifetime of a given key (setting this key never expires)Jedis.persist ("Key1"); //checks if a given key existsJedis.exists ("Key1"); //Rename key to Newkey, return an error when key and Newkey are the same or key does not existJedis.rename ("Key1", "Key2");//returns the type of value stored by key. //None (key does not exist), string (string), List (list), set (set), Zset (ordered set), hash (hash table)Jedis.type ("Key1");//set key lifetime and it will be automatically deleted when key expires. Jedis.expire ("Key1", 5);//expires in 5 seconds//The string value is associated to key. Jedis.set ("Key1", "value1"); //associates a value of values to a key and sets the lifetime of the key to seconds (seconds). Jedis.setex ("foo", 5, "haha"); //Clear all the keysJedis.flushall ();//returns the number of keysjedis.dbsize ();//The value of the field field in the hash table key is set to values. Jedis.hset ("Key1", "field1", "Field1-value"); Jedis.hset ("Key1", "Field2", "Field2-value"); Map Map=NewHashMap (); Map.put ("Field1", "Field1-value"); Map.put ("Field2", "Field2-value"); Jedis.hmset ("Key1", map); //returns the value of the given field field in the hash table keyJedis.hget ("Key1", "field1");//returns the value (multiple) of a given field field in a hash table keyList List = Jedis.hmget ("Key1", "field1", "Field2");  for(intI=0;i<list.size (); i++) {System.out.println (List.get (i));}//returns all fields and values in the hash table keymap<string,string> map = Jedis.hgetall ("Key1");  for(Map.entry entry:map.entrySet ()) {System.out.print (Entry.getkey () )+ ":" + entry.getvalue () + "\ T"); } //Delete one or more specified fields in the hash table keyJedis.hdel ("Key1", "field1"); Jedis.hdel ("Key1", "field1", "Field2");//View the hash table key for the existence of a given domain field. Jedis.hexists ("Key1", "field1");//returns all the fields in the hash table keyJedis.hkeys ("Key1");//returns all values in the hash table keyJedis.hvals ("Key1");//inserts the value values into the table header of the list key. Jedis.lpush ("Key1", "value1-0"); Jedis.lpush ("Key1", "Value1-1"); Jedis.lpush ("Key1", "Value1-2"); //returns the element in the specified interval in the list key, with the interval specified by the offset start and stop.//Subscript (Index) parameter start and stop starting from 0;//a negative subscript represents a starting from the back (1 indicates the last element of the list, 2 represents the penultimate element of the list, and so on)List List = Jedis.lrange ("Key1", 0,-1);//stop subscript is also within the value range (closed interval) for(intI=0;i<list.size (); i++) {System.out.println (List.get (i));}//returns the length of the list key. Jedis.llen ("Key1")//Add the member element to the collection key. Jedis.sadd ("Key1", "Value0"); Jedis.sadd ("Key1", "value1"); //removes the member element from the collection. Jedis.srem ("Key1", "value1"); //returns all members in the collection key. Set set = Jedis.smembers ("Key1"); //determines whether an element is a member of a collection keyJedis.sismember ("Key1", "value2")); //returns the number of elements of the collection keyJedis.scard ("Key1"); //returns all members of a collection that are the intersection of all given collectionsJedis.sinter ("Key1", "Key2") //returns all members of a collection, which is the set of all the given collectionsJedis.sunion ("Key1", "Key2")//returns all members of a collection, which is the difference set of all given collectionsJedis.sdiff ("Key1", "Key2");

Using Jedis to operate Redis