https://github.com/h3ar7b3a7/springmvc

After exploring Java Enterprise, Servlets & JSPs I felt ready to return back to Spring. I will explore what Spring MVC is all about, using a Spring servlet stack.
https://github.com/h3ar7b3a7/springmvc

code-configurator servlet-stack spring-mvc xml-configuration

Last synced: 13 days ago
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After exploring Java Enterprise, Servlets & JSPs I felt ready to return back to Spring. I will explore what Spring MVC is all about, using a Spring servlet stack.

• Host: GitHub
• URL: https://github.com/h3ar7b3a7/springmvc
• Owner: H3AR7B3A7
• Created: 2020-11-06T07:58:27.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-12-30T16:31:26.000Z (about 4 years ago)
• Last Synced: 2025-01-15T04:30:41.249Z (24 days ago)
• Topics: code-configurator, servlet-stack, spring-mvc, xml-configuration
• Language: Java
• Homepage:
• Size: 173 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Spring web MVC

After exploring Java Enterprise, Servlets & JSPs I felt ready to return to Spring and dive deeper into what Spring MVC is all about.

### 'WAR'ning

This project goes against the principle of:

    Make JAR, not WAR!

                            -- Josh Long

However, we will learn a lot about the inner workings of Spring. Also, there might be older projects we need to work on depending on this

monolithic type of packaging. (Or projects that for some reason need to save on web space, or depend on some other advantages of .war.)

## Setup

We don't start this project with the Spring initializr though, but use the Maven 'archetype-web-app' option under Maven projects.

We could also just make a maven project and enable web application support. In IntelliJ we navigate to:

'File -> Project Structure -> Modules'. There, select your web facet and click the plus button.) 

From what I understand, Spring hides some older project structure from the user, but to start off this project we will need access to the web.xml

in the "webapp > WEB-INF" - file structure. It is where we can set up and configure our connections to the 'invisible' dispatcher servlet,

the front-controller that has been doing all the hard work in our Spring projects without taking any credit.  

Be sure to check the [POM](https://github.com/H3AR7B3A7/SpringMVC/blob/master/pom.xml) to see common dependencies we will want to add to our project.

When using the Spring Initializr, it includes some of these dependencies already.

## Dispatcher Servlet

As its name suggests, it is a central dispatcher for HTTP request handlers/controllers, e.g. for web UI controllers or HTTP-based remote service exporters.

The dispatcher servlet dispatches requests and responses to registered handlers for processing, providing convenient mapping and exception handling facilities.  









## XML or JavaConfig

We started off with a full XML-based configuration of the web application and the dispatcher servlet. Then we discarded the 'web.xml'

and switched to using the annotated class 'MyWebInitializer'. After that we also changed out the -servlet.xml for the 'MyConfig' class.  

[Here](https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/WebApplicationInitializer.html)

we can find more information on how to set up either an XML-based configuration, a code-based one or even a hybrid.

### View Resolver

Because all requests go through our dispatcher servlet we can also add a prefix and suffix to our views here.

If we ever change the view layer we would just need to change the suffix in one location.  

Java Config:

    @Bean

        public InternalResourceViewResolver viewResolver(){

    

            InternalResourceViewResolver vr = new InternalResourceViewResolver();

            vr.setPrefix("/WEB-INF/");

            vr.setSuffix(".jsp");

    

            return vr;

        }

        

Xml:

    

        

        

        

    

It is also possible to mix or chain, more on this [here](https://docs.spring.io/spring-framework/docs/3.0.0.M3/spring-framework-reference/html/ch16s05.html).

## Error handling

Because we are not using spring boot, but are rather augmenting a Java web application with Spring features we would actually need web.xml in this case.

There is no Java Config equivalent for:  

    

            /error

    

    

In this [example](https://www.baeldung.com/servlet-exceptions) we can see how to fetch the error message along with the status code and exception type.

## More ...

We will continue exploring The Spring Servlet Stack in two separate repositories to avoid confusion.  

These repositories can be found here:

- [XML-based](https://github.com/H3AR7B3A7/SpringServletStackXml)

- [Code-based](https://github.com/H3AR7B3A7/SpringServletStackCode)