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Spring MVC

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Q)  Spring MVC ?


Ans)

Spring MVC frame work is another popular MVC framework for Web Apps like Struts.

Below is the sample Spring MVC configuration for the Log In Functionality.

Step 1 :

public class StartController extends SimpleFormController  {
 @Override
 protected ModelAndView onSubmit(HttpServletRequest httpServletRequest, HttpServletResponse
 httpServletResponse, Object o, BindException e) throws Exception {
    StartForm form = (StartForm) o;

    if (form.getCommand().equals("startForm")) {
        return new ModelAndView(new RedirectView("newOrder/newOrder.htm"));
    }
}

  @Override
  protected Object formBackingObject(HttpServletRequest httpServletRequest) throws Exception {
    AddDocumentForm form = new AddDocumentForm();
    return form;
  }

  @Override
  protected Map referenceData(HttpServletRequest request, Object o, Errors errors) throws Exception {
    Map<String, Object> map = super.referenceData(request, o, errors);
    return map;
  }
}

View :
   <bean name="/start.htm" class="com.salesorder.StartController">
        <property name="sessionForm" value="true"/>
        <property name="commandName" value="startForm"/>
        <property name="commandClass" value="com.salesorder.StartForm"/>
        <property name="formView" value="salesorder/start"/>
        <property name="successView" value="start.htm"/>
    </bean>
 

Resolver :

Views in Spring are addressed by a view name and are resolved by a view resolver,
Spring Offers Several View Resolvers such as "AbstractCachingViewResolver",
"XmlViewResolver","ResourceBundleViewResolver","InternalResourceViewResolver",
"VelocityViewResolver".

Each of the above solves different technical solution and offers different
 functionality.

"InternalResourceViewResolver" is most commonly used one , could be used as follows.

<bean id="viewResolver" class="
org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
  <property name="prefix" value="/WEB-INF/jsp/"/>
  <property name="suffix" value=".jsp"/>
 </bean>



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