Spring MVC - Basic

Spring MVC - Basic

Spring Dispatcher Class in 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>

The Dispatcher class as default look for dispacter-servlet.xml

To Change the file name Add below in web.xml

contextConfigLocation

/WEB-INF/mvc-dispatcher-servlet.xml

setting view Resolver in the DispacterServlet .xml

<bean id="viewResolver"

class="org.springframework.web.servlet.view.InternalResourceViewResolver" >

<property name="prefix">

<value>/WEB-INF/jsp/</value>

</property>

<property name="suffix">

<value>.jsp</value>

</property>

</bean>

Controllers in Spring

AbstractController

protected ModelAndView handleRequestInternal(HttpServletRequest request,

HttpServletResponse response) throws Exception {

}

SimpleFormCotroller

setCommandClass(User.class); - View Class (Form Class)

setCommandName("user");

FORM JSP Tags – Tag Lib

<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>

<form:radiobutton path="propertyName"> --- mapped to property in the view Class

To hook Submit call

<input type="submit">

protected ModelAndView onSubmit(Object command) throws Exception {

}

To Set the Form view and success page

<bean name="/welcome.htm" class="controller.UserController"

p:formView="userForm" p:successView="userSuccess" />

MultiActionController

<bean name="/user/*.htm" class="controller.CustomerController">

<property name="methodNameResolver">

<bean class="org.springframework.web.servlet.mvc.multiaction.InternalPathMethodNameResolver">

<property name="prefix" value="test" />

<property name="suffix" value="Customer" />

</bean>

</property>

</bean>

InternalPathMethodNameResolver

Simple implementation of MethodNameResolver that maps URL to method name. Although this is the default implementation used by the MultiActionController class (because it requires no configuration), it's bit naive for most applications. In particular, we don't usually want to tie URL to implementation methods.

methodNameResolver – Resolves the method name with prefix & suffix

Sample function

prefix-actionname(path)-suffix

public ModelAndView testaddCustomer(HttpServletRequest request,

HttpServletResponse response) throws Exception {

}

addCustomer – add.htm

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ParameterMethodNameResolver - Simple implementation of MethodNameResolver that looks for a parameter value containing the name of the method to invoke. 

  name="methodNameResolver">
         class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
            name="paramName" value="action"/>
        

public ModelAndView add(HttpServletRequest request,

HttpServletResponse response) throws Exception {

}

addCustomer – customer.htm?action=add

PropertiesMethodNameResolver

The most sophisticated and useful framework implementation of the MethodNameResolver interface. Uses java.util.Properties defining the mapping between the URL of incoming requests and method name. Such properties can be held in an XML document.

 class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">
       name="mappings">
        
            key="/customer/a.htm">add

key="/customer/b.htm">update key="/customer/c.htm">delete key="/customer/d.htm">list key="/customer/whatever.htm">add

method name = add

SimpleUrlHandlerMapping

 class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
            name="mappings">
                
                    key="/welcome.htm">welcomeController

key="/*/welcome.htm">welcomeController key="/helloGuest.htm">helloGuestController