Spring MVC - Controller Class Name Handler Mapping Example

Advertisements

The following example shows how to use the Controller Class Name Handler Mapping using the Spring Web MVC framework. The ControllerClassNameHandlerMapping class is the convention-based handler mapping class, which maps the URL request(s) to the name of the controllers mentioned in the configuration. This class takes the Controller names and converts them to lower case with a leading "/".

For example − HelloController maps to "/hello*" URL.

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

   <bean class = "org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>
 
   <bean class = "com.howcodex.HelloController" />

   <bean class = "com.howcodex.WelcomeController"/>   
</beans>

For example, using above configuration, if URI

/helloWorld.htm or /hello{any letter}.htm is requested, DispatcherServlet will forward the request to the HelloController.
/welcome.htm is requested, DispatcherServlet will forward the request to the WelcomeController.
/Welcome.htm is requested where W is capital cased, DispatcherServlet will not find any controller and the server will throw 404 status error.

To start with it, let us have a working Eclipse IDE in place and follow the subsequent steps to develop a Dynamic Form based Web Application using Spring Web Framework.

Step	Description
1	Create a project with a name TestWeb under a package com.howcodex as explained in the Spring MVC - Hello World chapter.
2	Create Java classes HelloController and WelcomeController under the com.howcodex package.
3	Create view files hello.jsp, welcome.jsp under the jsp sub-folder.
4	The final step is to create the content of the source and configuration files and export the application as explained below.

HelloController.java

package com.howcodex;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class HelloController extends AbstractController{
  
   @Override
   protected ModelAndView handleRequestInternal(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("hello");
      model.addObject("message", "Hello World!");
      return model;
   }
}

WelcomeController.java

package com.howcodex;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class WelcomeController extends AbstractController{
  
   @Override
   protected ModelAndView handleRequestInternal(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("welcome");
      model.addObject("message", "Welcome!");
      return model;
   }
}

TestWeb-servlet.xml

<beans xmlns = "http://www.springframework.org/schema/beans"
   xmlns:context = "http://www.springframework.org/schema/context"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

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

   <bean class = "org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>
 
   <bean class = "com.howcodex.HelloController" />

   <bean class = "com.howcodex.WelcomeController"/>  
</beans>

hello.jsp

<%@ page contentType="text/html; charset = UTF-8" %>
<html>
   <head>
      <title>Hello World</title>
   </head>
   <body>
      <h2>${message}</h2>
   </body>
</html>

welcome.jsp

<%@ page contentType = "text/html; charset=UTF-8" %>
<html>
   <head>
      <title>Welcome</title>
   </head>
   <body>
      <h2>${message}</h2>
   </body>
</html>

Once you are done with creating source and configuration files, export your application. Right click on the application, use the Export → WAR File option and save the TestWeb.war file in Tomcat's webapps folder.

Now, start your Tomcat server and make sure you are able to access other webpages from the webapps folder using a standard browser. Try a URL − http://localhost:8080/TestWeb/helloWorld.htm and we will see the following screen, if everything is fine with the Spring Web Application.

Spring Controller Class Name Handler Mapping 1

Try a URL http://localhost:8080/TestWeb/hello.htm and we will see the following screen, if everything is fine with the Spring Web Application.

Spring Controller Class Name Handler Mapping 2

Try a URL http://localhost:8080/TestWeb/welcome.htm and we will see the following screen, if everything is fine with the Spring Web Application.

Spring Controller Class Name Handler Mapping 3

Try a URL http://localhost:8080/TestWeb/Welcome.htm and we will see the following screen, if everything is fine with the Spring Web Application.

Spring Controller Class Name Handler Mapping 4

Previous Page Print Page