Spring Boot Mongo DB Example Application [Video]
Creating example applications can be helpful when you want to be sure that your app will make proper use of Spring Boot when integrated with Mongo DB.
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I’d like do a quick code review of my Spring Boot Mongo DB example application. This is up on GitHub and you can find it under my repository Spring framework Guru/spring — boot — Mongo DB. (Pretty creative name there.)
This is an example Spring Boot Application connect to Mongo DB, not necessarily running in Docker. I connect can connect to any Mongo DB database.
So, let’s take a quick look at the code in it and do a quick overview. I already have it loaded up in IntelliJ.
So, let's start up from the domain up. What I have is a product, and this is a standard mapping class for Spring, mapping out to a Mongo document. So, no big mystery there. We just have a product class with an ID, description, price, and image URL. So, nothing terribly exciting there.
Now I do have a couple converters, so I am using a form, a command form; some people call it command object to back it. So, this converts it back and forth. So, this my product form. It's a command. So, really the biggest difference there is that we are treating the ID as a string because Mongo database type does not really transfer over to the web tier very well. So, we do need to convert that back-and-forth.
So, next thing to look at our standard Spring MVC controller. This is the controller going to facing out to the web and handling web requests for us.
I did jump up a little bit, and if you’re following along, this pattern is gonna look very very familiar. So, I have a service layer that interacts with my controller layer. So this is my interface for the service. Then there’s my implementation of it. And I am using spring data repositories for this and almost all the wiring in my converter saw a wire in the two dependencies one is the product repository which is provided by spring data and this is the Mongo implementation that I am using and everything is wired up and then finally we have a couple time leaf templates here that we used to show the data so Megan I get into all the all the details here but you can see what’s going on here so nothing
I am using Spring Data Repositories for this and also wiring in my converter. I wire in the two dependencies. One is the product repository, which is provided by Spring Data, and this is the Mongo DB implementation that I am using. Everything is wired up.
And then finally, we have a couple Thymeleaf templates here that we used to show the data from Mongo. I’m not going to get into all the all the details here — but you can see what’s going on here.
So, nothing too terribly creative here. It's just a quick and dirty to get this working. It is not production grade by any means.
And then, let’s take a quick look at the dependencies. Up, you can see there on line 17, I am fact running Spring Boot 1.5.1, and that is the most current release of Spring Boot at the time of recording.
I’m bringing in a couple other dependencies, and these are important. So bring in the Spring Boot Starter Data for Mongo DB. As well as Thymeleaf, web, and of course the test.
And this POM is fairly untouched since I pulled it off of Josh Long’s favorite web site spring.start.io. I’m sorry start.spring.io. And that’s the URL so you can grab this at any time.
So, let's go ahead and take this for a spin. What I’m going to do, I have command line ready over here.
And I have Docker there so that’s a standard run command for Docker. Docker run map out the ports for the latest image of Mongo. And the minus D parameter tells it to run it in the background.
So, that is now running Docker. Use the command Docker PS see that it is running.
And let’s do Docker logs minus F with the image name here. So now you can see that it is running. Let’s bounce over to InteliJ and I am going to start up my Spring Boot application. We can see Spring Boot is initializing. Pretty light project, so it's going to come up pretty quick and it's running on Tomcat now. Look at the other window you see that I have a new connection established to Docker (to Mongo). I don’t have a log level turned up on this so we won’t see any database activity.
Let’s come over here and to localhost 8080 and that’s going to do a redirect to a product list. I did not initialize any data in the database, but I can come and create a new product. Product $22 and URL in URL. It’s not doing any data type checking there. It will show me that this is created. This is the Mongo ID that was created. So, now, I come back over here I see that it is listed. And should I want to edit it, and say do new product 2222. I am going to submit it, and we see that that is been updated. If I come back to the index again it redirects to product slash list. And I don’t have too much interesting here, but it shows that at that update has been persisted and is getting pulled out of the Mongo database.
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