Spring) Basics and Configuration

Spring Framework was first founded by Rod Johnson in his book <Expert One-one-one J2EE Design and Development> and the sample framework in the book was developed to nowadays' Spring Java Framework. It is developed to lessen the complexity of developing applications. 

 

There are a few characteristics of Spring Framework, such as Inversion of Contro, Dependency Injection, Aspect-Oriented Programming, and Model-View-Controller pattern. 

Inversion of Control (IoC) is a design principle that allows classes to be loosely coupled and, therefore, easier to test and maintain. Dependency Injection(DI) is a fundamental aspect of the Spring framework, through which the Spring container “injects” objects into other objects or “dependencies”. Aspect-Oriented Programming(AOP) helps break down the program's logic into several distinct parts called concerns.

 

Configuration

For the configuration on Eclipse, we will download Spring Tool Suit(STS) Program instead of adding a plugin. 

 

Click the link below to download Spring Tools 4 for Eclipse. 

Spring | Tools

Spring Tools 4 is the next generation of Spring tooling

If you want to download STS 3.x, click the link below.

Spring Tool Suite 3 · spring-attic/toolsuite-distribution Wiki · GitHub

GitHub - spring-attic/toolsuite-distribution: the distribution build for the Spring Tool Suite and the Groovy/Grails Tool Suite

I will download this.

Download and pin to taskbar.

This is the first screen that you will see once you run the program. 

It looks similar to Eclipse, but the difference is when you select a wizard. When you select a wizard. In Spring, you can create Spring projects.

Spring

Eclipse

Let's get started with setting encoding. 

In Window-Preferences Search "encoding".

In Workspace, CSS Files, HTML Files, JSP Files, you will set the encoding with your language. In my case, I will set as "UTF-8".

Since it is all set, we will make a spring project.

In File - New - Project, create Spring Legacy Project.

Choose the Spring MVC Project.

Insert the domain reversely. Click Finish, and it is all set!

 

If you can't see the encoding result (In the case of Korean), add this code to the file. 

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

This figure is how MVC in spring works. Since we now use @annotations, we don't pass to the Handler Mapping.

Client -> Dispatcher Servlet -> Controller-> ModelAndView -> ViewResolver -> View

When you run the project in Spring, web.xml will be read first.

 

You will see the prefix and suffix in the servlet-context.xml for the configuration. 

With this, you don't have to write them when you link the page in the HomeController.java.

In the next post, we will look through the main features of Spring Framework: IoC, DI, and AOP.