Redis with Java (Jedis, Lettuce) - Mini Project: Build & Apply

Simple Redis Key-Value Storage with Java

📖 Scenario: You are building a simple Java application that stores and retrieves user preferences using Redis. Redis is a fast, in-memory database often used for caching and quick data access.In this project, you will use Java with the Jedis client library to connect to Redis, store some user data, and then retrieve it.

🎯 Goal: Build a Java program that connects to Redis, stores a user's favorite color and language, and then retrieves and displays these preferences.

📋 What You'll Learn

Create a Jedis client connection to Redis

Store user preferences as key-value pairs in Redis

Retrieve the stored preferences from Redis

Close the Redis connection properly

💡 Why This Matters

🌍 Real World

Redis is widely used in real-world applications for caching user sessions, storing configuration, and fast data retrieval.

💼 Career

Knowing how to connect Java applications to Redis is valuable for backend developers working on scalable, high-performance systems.

1

Setup Jedis client connection

Create a Jedis client object called jedis that connects to Redis running on localhost at port 6379.

Redis

// Your code here to create Jedis client connection

Need a hint?

Use the new Jedis(host, port) constructor to create the client.

2

Store user preferences in Redis

Use the jedis object to store two key-value pairs: "user:1000:color" with value "blue" and "user:1000:language" with value "English".

Redis

import redis.clients.jedis.Jedis;

Jedis jedis = new Jedis("localhost", 6379);
// Your code here to set user preferences

Need a hint?

Use the set(key, value) method on the jedis object.

3

Retrieve user preferences from Redis

Retrieve the values for keys "user:1000:color" and "user:1000:language" using the jedis object and store them in variables color and language respectively.

Redis

import redis.clients.jedis.Jedis;

Jedis jedis = new Jedis("localhost", 6379);

jedis.set("user:1000:color", "blue");
jedis.set("user:1000:language", "English");
// Your code here to get user preferences

Need a hint?

Use the get(key) method on the jedis object and assign the results to variables.

4

Close the Jedis connection

Close the jedis connection by calling the close() method.

Redis

import redis.clients.jedis.Jedis;

Jedis jedis = new Jedis("localhost", 6379);

jedis.set("user:1000:color", "blue");
jedis.set("user:1000:language", "English");

String color = jedis.get("user:1000:color");
String language = jedis.get("user:1000:language");
// Your code here to close the connection

Need a hint?

Call close() on the jedis object to release resources.