ENAR - Redis on Heroku

HelloServlet.java

package com.example;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.Protocol;

public class HelloServlet extends HttpServlet {

	@Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        ServletOutputStream out = resp.getOutputStream();
        
        String output = "";
        
        try {
			Jedis store = openConnection();
			store.set("changenum", "third");
			
			output = "Hello: here's my " + store.get("changenum") + " change";
			
		} catch (Exception e) {
			output = e.getMessage();
		}
        
		out.write(output.getBytes());
		out.flush();
		out.close();
    }

	private Jedis openConnection() throws URISyntaxException {
		URI redisURI = new URI(System.getenv("REDISTOGO_URL"));
        JedisPool pool = new JedisPool(new JedisPoolConfig(), redisURI.getHost(),
                redisURI.getPort(),
                Protocol.DEFAULT_TIMEOUT,
                redisURI.getUserInfo().split(":",2)[1]);
        
        Jedis store = pool.getResource();
		return store;
	}
    
}

pom.xml

<dependency>
	<groupId>redis.clients</groupId>
	<artifactId>jedis</artifactId>
	<version>2.0.0</version>
	<type>jar</type>
	<scope>compile</scope>
</dependency>

Don't forget to add a Redis add-on to your Heroku app! I used the Redis Cloud add-on.

No I didn't! I used the Redistogo add-on.