Design & Development of Web Applications using SpringMVC

Design & Development
of Web Applications
using Spring MVC
by Naresh Chintalcheru

Spring MVC
Another Web MVC Framework?

Spring MVC
Another Web MVC Framework?
After learning Struts, JSF, DDUI …….
…………….. now Spring MVC ?

Spring MVC
● Benefit of using a Web Framework
● Removes the need of boilerplate code
● Gather HTTP Request Parameters
● Validation & Conversions
● Update the Model
● Standard code level design for multiple
applications in an enterprise
● Navigation Flow
● Validations

Spring MVC
● No Web Application Component Design
● Use Web Framework as Design Templates
and plugin the View, Model and Controllers

Spring MVC
● Speed up the development

Spring MVC
Web MVC Frameworks
● Struts
● JSF
● Wicket
● DDUI
● Spring MVC

Spring MVC
Presentation Layer Frameworks
● Web MVC Framework
● Template Framework
● View Technologies
● UI Widget Framework

Spring MVC
Template Frameworks
● Tiles
● Facelets
● SiteMesh
View Technologies
● JSP
● XHTML
● XSLT
UI Widget Frameworks
● JQuery
● DOJO
● SFX

Spring MVC
Why Spring MVC Framework?

Spring MVC
Spring MVC is a action-based or request-based
framework similar to Struts.
JSF is a component-based framework.

Spring MVC
Spring MVC vs JSF
● JSF is part of JEE Specification
● JSF is based on component architecture and
has learning curve
● Limited HTTP GET method support in JSF
● REST Web Services Support in Spring MVC.

Spring MVC
Spring MVC vs Struts
● Struts forces concrete Inheritance of
Action/ActionForm, taking away single shot of
Inheritance in Java.
● Spring MVC based on Interfaces and
Annotations.
● Spring MVC is truly view-agnostic. Many
options in View Technologies.
● Use Spring IoC Container from Presentation
Tier to Integration Tier.

Spring MVC
Spring MVC is only one module in the Spring Framework

Spring Framework Fundamentals
What is Spring Framework ?
● Spring Framework is …..
● Open Source Meta Framework
● Provides frameworks and container
● Simplify the development

Spring framework is a Layered Architecture
Choose the modules needed and eliminate other
modules
All modules are built on the top of its core
container

Spring Framework
Benefits:
● Light Weight
● Promotes good OO design
● Container Agnostic Framework : Insulates the
application from its hosting container.

Spring Has Two Web Frameworks
● Spring MVC
● Spring Web Flow

Spring Framework Web Flow
● Secondary Page Flow logic framework
● Can be used with Spring MVC, JSF and
Struts.

Spring MVC Request Flow ….

Spring MVC
Front Controller Design Pattern:
● DispatcherServlet is the Front Controller handles Client
Requests.
● ActionServlet in Struts
● FacesServlet in JSF
● AppServlet in DDUI

Spring MVC
Controller Design Pattern in MVC:
● Controllers are components that are being called by the
Dispatcher Servlet for performing page level logic and
delegate to Service Objects.
● Action Classes in Struts
● Managed Beans & Backed Beans in JSF
● PageProcessor in DDUI

Spring MVC
View Resolver & Navigation Logic:
● Resolves view names to views. Resolves navigation
logic from spring-mvc.xml
● Struts-config.xml in Struts
● Jsf-config.xml in JSF

Spring MVC
Developing App using Spring MVC:
● Step 1: web.xml : Front Controller
<web-app version="2.4">
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.*</url-pattern>
</servlet-mapping>
</web-app>

Spring MVC
● Step 2: web.xml : ApplicationContext
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-mvc.xml</param-value>
</context-param>

Spring MVC
● Step 3: spring-mvc.xml : Component Scan
<beans>
<context:component-scan base-package=“com.sf.web"/>
</beans>

Spring MVC
● Step 4: Controller Classes
@Controller
public class EmployeeController {
@Autowired
private final EmployeeSO employeeSO;
@RequestMapping("/emplist")
public String empHandler(Model model) {
List empList = employeeSO.getAllEmp();
model.addAttribute(“empList”, empList);
return “ListEmpPage” ;
}
}

Spring MVC
Bean Validation Framework JSR-303:
public class Employee {
@NotNull
@Pattern(regexp = "[a-z-A-Z]*")
private String firstName;
@Size(min=2, max=15)
private String lastName;
@Past
private Date birthDate;
@Email (message=“Invalid Email “)
private String email;

Spring MVC
REST Web Services:
http://localhost:8080/SpringMVC/employee/John
@Controller @RequestMapping("/employee")
public class EmployeeController {
@RequestMapping( value="/{name}“ )
public String getEmp(@PathVariable String name, ModelMap
model) {
model.addAttribute(“emp", name);
return “EmpListPage";
}
}

Design & Development of Web Applications using SpringMVC

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