Hey Folks!! Are you looking for any help with Java MVC example, Java MVC architecture, or Pattern Help?
Superb!!!! You are in the perfect place.
Hi, guys having difficulty in understanding Java MVC?
This tutorial is all about Java MVC and Java MVC example code.
What is Java MVC?
Java MVC stands for Model View and Controller.
Java MVC is an architecture that programmers follow while programming Java applications.
Why use Java MVC?
The answer is-
- Make the code more organized and standard.
- Avoid complexity.
- Enable easy debugging.
The main purpose of MVC is to ease down and reduce the complexity when it comes to building a large application that contains n number of modules.
Let me explain to you MVC architecture in java with a diagram.
So the above diagram shows 3 different main components of MVC architecture. It’s a way we organize our code into different packages for every module of an application.
MVC architecture includes View, VO, BO, Controller, and DAO layer. The controller maintains the interconnectivity with the View, VO, BO, and the DAO layers.
Let say for example we want to design a Login Page using Java MVC architecture.
How to achieve MVC pattern in java?
Now, here is the Login Page java MVC example.
Imagine Login Page as a small module of a large web application. Let’s divide the module(Login Page) into various layers.
First of all starting with the View.
What is a View in java MVC pattern?
The view is a layer that contains the front page in which the end-users see and interact.
Hence, the front-end part of the application is the View.
An example of a View is HTML or JSP which contains the content and various elements of the webpage.
Coming to the Back-end.
By providing the login credentials i.e the User Name and Password a user sends a response to the back-end.
Next what happens is that the Controller receives the login details from the View.
It is the task of the Controller to decide what to do with those details. For example where to send it and for what task.
The process goes like this, the first thing the Controller does is that it sends the details to the VO(value object) layer for modeling up of data into data objects after receiving it from the view.
Note: Few programmers refer to VO as the POJO class.
Then comes the BO layer.
The controller sends the value objects to the business layers for any kind of data manipulation.
All the required business logic is present in the BO layer.
In this example, the details need to be checked whether it a valid credential or not i.e the Username and Password.
Now we have the View, Model Object ready, and the Business Objects ready.
So the next task for the BO is in this case, match the data or check it if it is present in the database or not. Finally, DAO(data object access) comes into the picture.
It contains all the database connections, the database driver registration, and the required DB queries which are needed for retrieving data from the database.
Note: Few programmers refer DAO as the DTO.
Accordingly, the data comes back to the Controller and it again interacts with the view to show the output to the end-user on the screen.
In conclusion, the Controller keeps the process flow between various layers (View, VO, BO, and DAO).