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Home > Web Development > Server Side Web Development > Spring MVC Beginner's Guide
Spring MVC Beginner's Guide
Spring MVC Beginner's Guide

Spring MVC Beginner's Guide: Unleash the power of the latest Spring MVC 4.x to develop a complete application , Second Edition

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Spring MVC Beginner's Guide

Chapter 2. Spring MVC Architecture – Architecting Your Web Store

What we saw in the first chapter was nothing but a glimpse of Spring MVC. Our total focus was just to get a Spring MVC application running. Now it's time for us to deep dive into the Spring MVC architecture.

By the end of this chapter, you will have a clear understanding of:

  • The Dispatcher servlet and request mapping
  • Web application context and configuration
  • Spring MVC request flow and Web MVC
  • A typical Spring web application architecture

Dispatcher servlet

In the first chapter, we provided a little introduction to the Dispatcher servlet and you saw how to configure a Dispatcher servlet using the DispatcherServletInitializer class. You learned that every web request first comes to the Dispatcher servlet. The Dispatcher servlet is the thing that decides which controller method the web request should be dispatched to. In the previous chapter, we created a welcome page that will be shown whenever we enter the URL http://localhost:8080/webstore/ in the browser. Mapping a URL to the appropriate controller method is the primary duty of the Dispatcher servlet.

So the Dispatcher servlet reads the web request URL and finds the appropriate controller method that can serve that web request and invokes it. This process of mapping a web request onto a specific controller method is called request mapping. And the Dispatcher servlet is able to do this with the help of the @RequestMapping (org.springframework.web.bind.annotation.RequestMapping...

Understanding the Dispatcher servlet configuration

Now we've got a basic idea of how request mapping works. I also mentioned that every web request first comes to the Dispatcher servlet, but the question is how does the Dispatcher servlet know it should handle every incoming request? The answer is we explicitly instructed it to do so through the getServletMappings method of the DispatcherServletInitializer class. Yes, when we return the string array containing only the "/" character, it indicates the DispatcherServlet configuration as the default servlet of the application. So every incoming request will be handled by DispatcherServlet.

Time for action - examining the servlet mapping

Let's observe what will happen when we change the return value of the getServletMappings method.

  1. Open DispatcherServletInitializer and change the return value of the getServletMappings method as return new String[] { "/app/*"}; basically your getServletMappings method should look...

Servlet mapping versus request mapping

The servlet mapping specifies which web container of the Java servlet should be invoked for a given URL. It maps the URL patterns to servlets. When there is a request from a client, the servlet container decides which servlet it should forward the request to based on the servlet mapping. In our case, we mapped all incoming requests to DispatcherServlet.

In contrast, request mapping guides the DispatcherServlet which controller method it needs to invoke as a response to the request based on the request path. In our case, we mapped the /welcome request path to the welcome method of the HomeController class.

Pop quiz - servlet mapping

Considering the following servlet mapping, identify the possible matching URLs:

@Override 
protected String[] getServletMappings() { 
   return new String[] { "*.do"}; 
}
  1. http://localhost:8080/webstore/welcome
  2. http://localhost:8080/webstore/do/welcome
  3. http://localhost:8080/webstore/welcome.do
  4. http://localhost:8080/webstore...

Web application context

In a Spring-based application, our application objects will live within an object container. This container will create objects and associations between objects and manage their complete lifecycle. These container objects are called Spring managed beans (or simply beans) and the container is called application context in the Spring world.

Spring's container uses dependency injection (DI) to manage the beans that make up an application. An application context (org.springframework.context.ApplicationContext) creates beans, associates beans together based on bean configuration, and dispenses beans upon request. A bean configuration can be defined via an XML file, annotation, or even via Java configuration classes. We are going to use annotation and Java configurations in our chapters.

A web application context is an extension of the application context, and is designed to work with the standard servlet context (javax.servlet.ServletContext). The web application context...

View resolvers

A view resolver helps the Dispatcher servlet to identify the views that have to be rendered as a response to a specific web request. Spring MVC provides various view resolver implementations to identify views and InternalResourceViewResolver is one such implementation:

@Bean 
public InternalResourceViewResolver getInternalResourceViewResolver() { 
    InternalResourceViewResolver resolver = new InternalResourceViewResolver(); 
    resolver.setViewClass(JstlView.class); 
    resolver.setPrefix("/WEB-INF/jsp/"); 
    resolver.setSuffix(".jsp"); 
 
    return resolver; 
}

Through the above bean definition is in the web application context configuration (WebApplicationContextConfig), we are instructing Spring MVC to create a bean for the class InternalResourceViewResolver (org.springframework.web.servlet.view.InternalResourceViewResolver). We will see more about the view resolver in Chapter 5, Working with View Resolver.

Time for action - understanding web...

Understanding the web application context configuration

The web application context configuration file (WebApplicationContextConfig.java) is nothing but a simple Java-based Spring bean configuration class. Spring will create beans (objects) for every bean definition mentioned in this class during the boot up of our application. If you open this web application context configuration file, you will find the following annotations on top of the class definition:

  • @Configuration: This indicates that a class declares one or more @Bean methods
  • @EnableWebMvc: Adding this annotation to an @Configuration class imports some special Spring MVC configuration
  • @ComponentScan: This specifies the base packages to scan for annotated components (beans)

The first annotation @Configuration indicates that this class declares one or more @Bean methods. If you remember, in the last section, I explained how we created a bean definition for InternalResourceViewResolver.

The second annotation is @EnableWebMvc. With this...

Dispatcher servlet

In the first chapter, we provided a little introduction to the Dispatcher servlet and you saw how to configure a Dispatcher servlet using the DispatcherServletInitializer class. You learned that every web request first comes to the Dispatcher servlet. The Dispatcher servlet is the thing that decides which controller method the web request should be dispatched to. In the previous chapter, we created a welcome page that will be shown whenever we enter the URL http://localhost:8080/webstore/ in the browser. Mapping a URL to the appropriate controller method is the primary duty of the Dispatcher servlet.

So the Dispatcher servlet reads the web request URL and finds the appropriate controller method that can serve that web request and invokes it. This process of mapping a web request onto a specific controller method is called request mapping. And the Dispatcher servlet is able to do this with the help of the @RequestMapping (org.springframework.web.bind.annotation.RequestMapping...

Understanding the Dispatcher servlet configuration

Now we've got a basic idea of how request mapping works. I also mentioned that every web request first comes to the Dispatcher servlet, but the question is how does the Dispatcher servlet know it should handle every incoming request? The answer is we explicitly instructed it to do so through the getServletMappings method of the DispatcherServletInitializer class. Yes, when we return the string array containing only the "/" character, it indicates the DispatcherServlet configuration as the default servlet of the application. So every incoming request will be handled by DispatcherServlet.

Time for action - examining the servlet mapping

Let's observe what will happen when we change the return value of the getServletMappings method.

  1. Open DispatcherServletInitializer and change the return value of the getServletMappings method as return new String[] { "/app/*"}; basically your getServletMappings method should look like the following after your change...

Servlet mapping versus request mapping

The servlet mapping specifies which web container of the Java servlet should be invoked for a given URL. It maps the URL patterns to servlets. When there is a request from a client, the servlet container decides which servlet it should forward the request to based on the servlet mapping. In our case, we mapped all incoming requests to DispatcherServlet.

In contrast, request mapping guides the DispatcherServlet which controller method it needs to invoke as a response to the request based on the request path. In our case, we mapped the /welcome request path to the welcome method of the HomeController class.

Pop quiz - servlet mapping

Considering the following servlet mapping, identify the possible matching URLs:

@Override 
protected String[] getServletMappings() { 
   return new String[] { "*.do"}; 
}

  1. http://localhost:8080/webstore/welcome

  2. http://localhost:8080/webstore/do/welcome

  3. http://localhost:8080/webstore/welcome.do

  4. http://localhost...

Web application context

In a Spring-based application, our application objects will live within an object container. This container will create objects and associations between objects and manage their complete lifecycle. These container objects are called Spring managed beans (or simply beans) and the container is called application context in the Spring world.

Spring's container uses dependency injection (DI) to manage the beans that make up an application. An application context (org.springframework.context.ApplicationContext) creates beans, associates beans together based on bean configuration, and dispenses beans upon request. A bean configuration can be defined via an XML file, annotation, or even via Java configuration classes. We are going to use annotation and Java configurations in our chapters.

A web application context is an extension of the application context, and is designed to work with the standard servlet context (javax.servlet.ServletContext). The web application context...

View resolvers

A view resolver helps the Dispatcher servlet to identify the views that have to be rendered as a response to a specific web request. Spring MVC provides various view resolver implementations to identify views and InternalResourceViewResolver is one such implementation:

@Bean 
public InternalResourceViewResolver getInternalResourceViewResolver() { 
    InternalResourceViewResolver resolver = new InternalResourceViewResolver(); 
    resolver.setViewClass(JstlView.class); 
    resolver.setPrefix("/WEB-INF/jsp/"); 
    resolver.setSuffix(".jsp"); 
 
    return resolver; 
}

Through the above bean definition is in the web application context configuration (WebApplicationContextConfig), we are instructing Spring MVC to create a bean for the class InternalResourceViewResolver (org.springframework.web.servlet.view.InternalResourceViewResolver). We will see more about the view resolver in Chapter 5, Working with View Resolver.

Time for action...

Understanding the web application context configuration

The web application context configuration file (WebApplicationContextConfig.java) is nothing but a simple Java-based Spring bean configuration class. Spring will create beans (objects) for every bean definition mentioned in this class during the boot up of our application. If you open this web application context configuration file, you will find the following annotations on top of the class definition:

  • @Configuration: This indicates that a class declares one or more @Bean methods

  • @EnableWebMvc: Adding this annotation to an @Configuration class imports some special Spring MVC configuration

  • @ComponentScan: This specifies the base packages to scan for annotated components (beans)

The first annotation @Configuration indicates that this class declares one or more @Bean methods. If you remember, in the last section, I explained how we created a bean definition for InternalResourceViewResolver.

The second annotation is @EnableWebMvc. With this...

Model View Controller

So far, we have looked at lots of concepts such as the Dispatcher servlet, request mapping, controllers, and the view resolver, but it would be good to see the overall picture of the Spring MVC request flow so that we can understand each component's responsibilities. But before that, you need a basic understanding of the Model View Controller (MVC) concept. Every enterprise level application's Presentation layer can be logically divided into three major parts:

  • The part that manages the data (Model)

  • The part that creates the user interface and screens (View)

  • The part that handles interactions between the user, the user interface, and the data (Controller)

The following diagram should help you to understand the event flow and command flow within an MVC pattern.

The classic MVC pattern

Whenever a user interacts with the view by clicking on a link or button, or something similar, the view issues an event notification to the controller and the controller issues a command notification...

Overview of the Spring MVC request flow

The main entry point for a web request in a Spring MVC application is via the Dispatcher servlet. The Dispatcher servlet acts as a front controller and dispatches the requests to the other controller. The front controller's main duty is to find the appropriate right controller to hand over the request for further processing. The following diagram shows an overview of the request flow in a Spring MVC application:

The Spring MVC request flow

Okay, let's review the Spring MVC request flow in short:

  1. When we enter a URL in the browser, the request comes to the Dispatcher servlet. The Dispatcher servlet acts as a centralized entry point to the web application.

  2. The Dispatcher servlet determines a suitable controller that is capable of handling the request and dispatching that request to the controller.

  3. The controller method updates the objects in the model and returns the logical view name and updated model to the Dispatcher servlet.

  4. The Dispatcher servlet consults...

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Key benefits

  • Work through carefully crafted exercises with detailed explanations for each step will help you understand the concepts with ease
  • You will gain a clear understanding of the end-to-end request/response life cycle, and each logical component’s responsibility
  • This book is packed with tips and tricks that demonstrate industry best practices on developing a Spring-MVC-based application

Description

Spring MVC helps you build flexible and loosely coupled web applications. The Spring MVC Framework is architected and designed in such a way that every piece of logic and functionality is highly configurable. Also, Spring can integrate effortlessly with other popular web frameworks such as Struts, WebWork, Java Server Faces, and Tapestry. The book progressively teaches you to configure the Spring development environment, architecture, controllers, libraries, and more before moving on to developing a full web application. It begins with an introduction to the Spring development environment and architecture so you're familiar with the know-hows. From here, we move on to controllers, views, validations, Spring Tag libraries, and more. Finally, we integrate it all together to develop a web application. You'll also get to grips with testing applications for reliability.

Who is this book for?

The book is for Java developers who want to exploit Spring MVC and its features to build web applications. Some familiarity with basic servlet programming concepts would be a plus, but is not a prerequisite.

What you will learn

  • * Familiarize yourself with the anatomy of the Spring 4.X development environment
  • * Understand web application architecture and the Spring MVC request flow
  • * Integrate bean validation and custom validation
  • * Use error handling and exception resolving
  • * Get to grips with REST-based web service development and Ajax
  • * Test your web application
Estimated delivery fee Deliver to Australia

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Last updated date : Feb 11, 2025
Publication date : Jul 29, 2016
Length: 350 pages
Edition : 2nd
Language : English
ISBN-13 : 9781785880636
Category :
Web Development
Languages :
Java
Concepts :
Server Side Web Development
Tools :
Spring

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OR

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Last updated date : Feb 11, 2025
Publication date : Jul 29, 2016
Length: 350 pages
Edition : 2nd
Language : English
ISBN-13 : 9781785880636
Category :
Web Development
Languages :
Java
Concepts :
Server Side Web Development
Tools :
Spring

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Table of Contents

12 Chapters
1. Configuring a Spring Development Environment Chevron down icon Chevron up icon
1. Configuring a Spring Development Environment
Setting up Java
Configuring a build tool
Installing a web server
Configuring a development environment
Creating our first Spring MVC project
Spring MVC dependencies
A jump-start to MVC
The Dispatcher servlet
Deploying our project
Summary
2. Spring MVC Architecture – Architecting Your Web Store Chevron down icon Chevron up icon
2. Spring MVC Architecture – Architecting Your Web Store
Dispatcher servlet
Understanding the Dispatcher servlet configuration
Servlet mapping versus request mapping
Web application context
View resolvers
Understanding the web application context configuration
Model View Controller
Overview of the Spring MVC request flow
The web application architecture
The Domain layer
The Persistence layer
The Service layer
An overview of the web application architecture
Summary
3. Control Your Store with Controllers Chevron down icon Chevron up icon
3. Control Your Store with Controllers
The role of a Controller in Spring MVC
Defining a Controller
Default request mapping method
Handler mapping
Using URI template patterns
Using matrix variables
Understanding request parameters
Summary
4. Working with Spring Tag Libraries Chevron down icon Chevron up icon
4. Working with Spring Tag Libraries
The JavaServer Pages Standard Tag Library
Serving and processing forms
Customizing data binding
Externalizing text messages
Summary
5. Working with View Resolver Chevron down icon Chevron up icon
5. Working with View Resolver
Resolving Views
RedirectView
Flash attribute
Serving static resources
Multipart requests in action
Using ContentNegotiatingViewResolver
Working with HandlerExceptionResolver
Summary
6. Internalize Your Store with Interceptor Chevron down icon Chevron up icon
6. Internalize Your Store with Interceptor
Working with interceptors
LocaleChangeInterceptor - internationalization
Mapped interceptors
Summary
7. Incorporating Spring Security Chevron down icon Chevron up icon
7. Incorporating Spring Security
Using Spring Security
Summary
8. Validate Your Products with a Validator Chevron down icon Chevron up icon
8. Validate Your Products with a Validator
Bean Validation
Custom validation with JSR-303/Bean Validation
Spring validation
Summary
9. Give REST to Your Application with Ajax Chevron down icon Chevron up icon
9. Give REST to Your Application with Ajax
Introduction to REST
Handling web services in Ajax
What just happened?
Summary
10. Float Your Application with Web Flow Chevron down icon Chevron up icon
10. Float Your Application with Web Flow
Working with Spring Web Flow
Understanding flow definitions
Understanding checkout flow
Summary
11. Template with Tiles Chevron down icon Chevron up icon
11. Template with Tiles
Enhancing reusability through Apache Tiles
Summary
12. Testing Your Application Chevron down icon Chevron up icon
12. Testing Your Application
Unit testing
Integration testing with the Spring Test context framework
Summary
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Amit Beriwal May 06, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
One of the rare gems. Finally helped me understand Spring MVC in simple terms. The language used is very simple and effective. Focuses on a practical approach. Highly recommended.
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David Nov 01, 2016
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Excellent book for beginners. I learned a lot of this stuff digging around the internet, I wish I would have bought this book first. It would have saved me a lot of trouble.
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George Jun 29, 2017
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Amazing how this book is organised :) , i was enjoying the book as it is a story.
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L. Figueroa Aug 04, 2019
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I decided to pick up this book after much frustration with another book. This book is excellent in the step by step instruction. There are a few (very few) minor issues but all quite obvious and will not prevent you from completing the exercises. I love the detailed explanations of everything that was used. I also found myself completing all the "Have a go Hero" exercises that required you to extend the application on your own. I had no problems at all because of the well explained steps and reasoning behind everything. I wish all my book investments were as well done as this book. I highly recommend it.
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Jean-Simon Vaillant Oct 05, 2019
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Step by Step explanations. Good examples. I was totally pleased with it.
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About the author

Profile icon Ganeshan
Ganeshan
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Amuthan Ganeshan is an experienced software professional with more than ten years of experience specializing in building distributed big data applications. He currently works as a senior software engineer at an industrial artificial intelligence software company. He is a big data enthusiast and loves sharing knowledge about software development and practices through his blog at Code Culture. He has hands on experience in developing and deploying distributed systems and has successfully delivered many steaming analytics solutions. He is also a frequent speaker in many big data conferences and authored books on enterprise Java application development.
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Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
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