Redis Java Tutorial

Install Redis on Linux

sudo apt-get install redis

Do allow port 6379, which is being used by Redis.

 sudo ufw allow 6379

Redis Command Line

You can connect to redis using redis-cli. You can test your operations on the redis server using the cli

Connect to remote redis client

 redis-cli -h 192.168.1.20 -p 6379

Get and SET operation using CLI.

127.0.0.1:6379> SET x "Hello World"
OK
127.0.0.1:6379> GET X
(nil)
127.0.0.1:6379> GET x
"Hello World"

Java Clients

Now we will try to perform the same operation using the java client.

There are two popular clients in java for connecting to Redis.

We are going to use redisson for our example.

grab 'org.redisson:redisson:3.2.0'

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.2.0</version>
</dependency>

Setup Java Redis client

In the below code we are trying to connnect to redis server installed on the same machine.

import org.redisson.Redisson;
import org.redisson.api.RBucket;
import org.redisson.api.RedissonClient;

Config config = new Config();
// use single Redis server
config.useSingleServer().setAddress("redis://127.0.0.1:6379");
redisson = Redisson.create(config);

Bucket Operations

// perform operations
bucket = redisson.getBucket("simpleObject");

bucket.set("This is object value");
RMap<String, String> map = redisson.getMap("simpleMap");

map.put("mapKey", "This is map value");

String objectValue = bucket.get();

System.out.println("stored object value: " + objectValue);

String mapValue = map.get("mapKey");

System.out.println("stored map value: " + mapValue);

redisson.shutdown();