Jedis String operation and validity setting

Example one,

// Create a redis instance based on the redis service address and port, the redis port generally defaults to 6379
		Jedis jedis = new Jedis("10.110.20.152", 6379);

		// Set the string value as value of the key.
		// The string can't be longer than 1073741824 bytes (1 * GB)
		jedis.set("china", "中国");

		// Get the value of the specified key.
		// If the key does not exist null is returned.
		// If the value stored at key is not a string an error is returned
		// because GET can only handle string values.
		String value = jedis.get("china");

		// print result: China
		System.out.println(value);

		// Closes this stream and releases any system resources
		//associated with it.
		jedis.close();

 View through Redis client

 

TTL:-1 means never expires.
 

 

Example two,

// Create a redis instance based on the redis service address and port, the redis port generally defaults to 6379
		Jedis jedis = new Jedis("10.110.20.152", 6379);

	  /**
	   * Set the string value as value of the key.
	   * The string can't be longer than 1073741824 bytes (1 * GB).
	   * @param key
	   * @param value
	   * @param nxxx NX | XX,
	   * 		NX -- Only set the key if it does not already exist.
	   * 		XX -- Only set the key if it already exist.
	   * @param expx EX|PX, expire time units: EX = seconds; PX = milliseconds
	   * @param time expire time in the units of <code>expx</code>
	   **/
		jedis.set("china", "China","NX","EX",100);//It will be deleted automatically after 100 seconds.

		// Get the value of the specified key.
		// If the key does not exist null is returned.
		// If the value stored at key is not a string an error is returned
		// because GET can only handle string values.
		String value = jedis.get("china");

		// print result: China
		System.out.println(value);

		// Closes this stream and releases any system resources
		//associated with it.
		jedis.close();

 View through Redis client

 

After the expiration time is reached, the cached information will be automatically deleted.