3303. Redis - Using Redis in Java
Redis

Using Redis in Java programs

1. Redis Java Driver

There are many redis clients. We will use Jedis.jar which is for java. Download Jedis.jar from here. Then, include the jedis.jar in java project.

2. Redis Connection

If redis is installed in Ubuntu Virtual Machine, we need to find the ip address of Ubuntu. Settings->Network, click the setting icon. image See the ip address, eg. ‘192.168.182.130’. image

Edit file /etc/redis/redis.conf in Ubuntu. Change bind from ‘127.0.0.1 ::1’ to ‘0.0.0.0 ::1’. Or directly comment out.

bind 127.0.0.1 ::1

Restart redis server.

sudo systemctl restart redis

Check if redis can be access with non-local ip address.

$ redis-cli -h 192.168.182.130 192.168.182.130:6379>ping PONG

3. Java Program

Three operations.

  • Connect to Redis Server
  • Write data to Redis
  • Read data from Redis
package johnny.java.redis; import redis.clients.jedis.Jedis; import java.util.List; import java.util.Set; public class RedisExample { public static void main(String[] args) { //Connecting to Redis server on localhost Jedis jedis = new Jedis("192.168.182.130"); System.out.println("Connection to server successfully"); //check whether server is running or not System.out.println("Server is running: "+jedis.ping()); //set the data in redis string jedis.set("tutorial-name", "Redis tutorial"); System.out.println("Stored string in redis:: "+ jedis.get("username")); //store data in redis list jedis.lpush("tutorial-list", "Redis"); jedis.lpush("tutorial-list", "Mongodb"); jedis.lpush("tutorial-list", "Mysql"); // Get the stored data and print it List<String> list = jedis.lrange("tutorial-list", 0 ,5); for(int i = 0; i<list.size(); i++) { System.out.println("Stored string in redis:: "+list.get(i)); } //store data in redis list // Get the stored data and print it Set<String> set = jedis.keys("*"); for (String key : set) { System.out.println("List of stored keys:: "+key); } } }

Output.

Connection to server successfully Server is running: PONG Stored string in redis:: Redis tutorial Stored string in redis:: Mysql Stored string in redis:: Mongodb Stored string in redis:: Redis List of stored keys:: tutorial-name List of stored keys:: tutorial-list

4. Source Files

5. References