In this session you will learn: MVC Spring MVC Configuring web.xml Creating Controller Registering controller with dispatcher-servlet Mapping requests to controller Rendering response to View For more information, visit: https://www.mindsmapped.com/courses/software-development/java-developer-training-for-beginners/

1. Java/J2ee Programming Training
Spring Web MVC

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Agenda
• MVC
• Spring MVC
• Configuring web.xml
• Creating Controller
• Registering controller with dispatcher-servlet
• Mapping requests to controller
• Rendering response to View

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MVC
• Model
• represents the business data
• View
• Web pages presented to the user
• Controller
• controls the flow of application

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controller
model
view

5. doGet()
{
Emp e = EDao.getEmp( 100 );
request.setAttribute(“emp”,emp);
RequestDispatcher rd;
Rd =
req.getRequestDispatcher(“EmpVu.jsp”);
Rd.forward(reques, response);
}
EmpVu.jsp
Emp:100
submit
Emp: 100
Fname:Jack
Lname:Tom
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5
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3

6. doGet()
{
Emp e = EDao.getEmp( 100 );
request.setAttribute(“emp”,emp);
RequestDispatcher rd;
Rd = req.getRequestDispatcher(“EmpVu.jsp”);
Rd.forward(reques, response);
}
EmpVu.jsp
Emp:100
submit
Emp:
Fname:
Lname:
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5
1
2
3
Request
emp
Emp:100
Fname:Jack
Lname:Tom
response

7. doGet()
{
Emp e = EDao.getEmp( 100 );
request.setAttribute(“emp”,e
mp);
RequestDispatcher rd;
Rd =
req.getRequestDispatcher(“EmpVu.jsp”);
Rd.forward(reques, response);
}
${requestScope.emp.fname}
${requestScope.emp.lname}
${requestScope.emp.lname}
Emp:100
submit
Emp: 100
Fname:Jack
Lname:Tom
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2
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response
Request
emp
Rd.forward( req, resp);

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Spring MVC
• open for extension closed for modification
• Pluggable View Technology: JSP, JSF, Velocity
• Injection of services into controller:
• removes code redundancy between business layer and presentation layer
• Integration with other components:
• integrates with other frameworks such as struts , hibernate, JSF

9. Handler Mapping
RequetsDispatcher
ModelView
Controller
ViewResolverView
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1

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Configuring web.xml
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>

11. Creating Controller
public class RegisterController extends AbstractController{
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest hsr, HttpServletResponse hsr1) throws
Exception {
ModelAndView mv = new ModelAndView("success");
mv.addObject("user", "John");
return mv;
}
}

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Registering controller with dispatcher-servlet
<bean id="registerController"
class="controller.RegisterController"/>

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Mapping requests to controller
• BeanNameUrlHandlerMapping
• SimpleUrlHandlerMapping
• ControllerClassNameHandlerMapping

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BeanNameUrlMapping

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SimpleURLHandlerMapping

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ControllerClassHandlerMapping

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Mapping requests to controller
<bean id="urlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"
>
<property name="mappings">
<props>
<prop key="index.htm">indexController</prop>
<prop key="register.htm">registerController</prop>
</props>
</property>
</bean>

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Rendering response to View
• Declare a view resolver
• create a view to render the response
• View Resolver: maps the logical name to actual view
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/jsp/"
p:suffix=".jsp" />

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Rendering response to View
• Declare a view resolver
• create a view to render the response
• View Resolver: maps the logical name to actual view
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/jsp/"
p:suffix=".jsp" />

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Thank You