时间设置Java使用Redis设置过期时间（redisjava过期）

Time Setting Java Using Redis To Set Expiration Time

Time is a precious thing and often people don’t get enough of it. For this reason, it is important to know how to effectively manage your time and make the best use of it. This is especially true when it comes to programming. Setting expiration times on objects using Redis to protect your data is one way to ensure that our applications are able to handle data more efficiently.

Redis is an open-source in-memory data structure store that is commonly used to store strings, hashes, lists, sets, and sorted sets. Redis has the additional advantage of being able to expire values as soon as they become stale or no longer needed, which makes it particularly useful for managing time-sensitive data.

Now let’s learn how we can use Redis to set expiration time in Java. To set an expiration time for a key, the Java program should first create a Jedis object and then connect it with a Redis server. After that, use the ‘setex’ command in order to associate the expiration time with any key. This command takes the key name, expiration time, and message as parameters.

For example, the following code will set the ‘hello’ key with a message and an expiration time of 5 seconds:

Jedis jedis = new Jedis(“localhost”);

jedis.setex(“hello”, 5, “world”);

In addition to the ‘setex’ command, Java programs can also use the ‘expire’ command to set only the expiration time for any key. This command takes the key name and expiration time(in seconds) as parameters. Here is an example of how to use the expire command:

Jedis jedis = new Jedis(“localhost”);

jedis.expire(“hello”, 5);

Once the expiration time has been set, the Java program can then use the ‘ttl’ command to check the remaining time left for the key. This command takes the key name as its parameter and returns the remaining time in seconds. If the key has already expired, it will return -2.

Jedis jedis = new Jedis(“localhost”);

long remainingTime = jedis.ttl(“hello”);

Using Redis to set expiration times allows us to control the data lifetime and optimize its performance in our Java applications. It is relatively easy to setup and provides reliable time management.