Project Confucius: Spring MVC

First we update web.xml to direct all requests to the Spring MVC Servlet, like this:

 <web-app>   
  <servlet>  
   <servlet-name>springmvc</servlet-name>  
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
   <load-on-startup>1</load-on-startup>  
  </servlet>  
    
  <servlet-mapping>  
   <servlet-name>springmvc</servlet-name>  
   <url-pattern>*.do</url-pattern>  
  </servlet-mapping>  
 </web-app>

Now, in your /WEB-INF folder, create a file springmvc-servlet.xml to declare how to wire the MVC, like this:
Note that the name of the file is based on the Servlet name in web.xml (springmvc).

 <?xml version="1.0" encoding="UTF-8"?>  
 <beans xmlns="http://www.springframework.org/schema/beans" 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-2.5.xsd">  
    
  <bean name="/register.do" class="org.confucius.HelloWorldController"/>  
    
  <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>  
    <property name="prefix" value="/jsp/"/>  
    <property name="suffix" value=".jsp"/>  
  </bean>  
    
 </beans>

Here we are directing all the /register.do requests to the HelloWorldCOntroller.
All Views returned by the controllers will be directed to the /jsp/.jsp file.

In your /src/org/confucius folder, create a class HelloWorldController.java, like this:

 package org.confucius;  
   
 import javax.servlet.http.HttpServletRequest;  
 import javax.servlet.http.HttpServletResponse;  
   
 import org.springframework.web.servlet.ModelAndView;  
 import org.springframework.web.servlet.mvc.Controller;  
   
 public class HelloWorldController implements Controller {  
   
      public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {  
           String firstName = request.getParameter("firstName");  
           String lastName = request.getParameter("lastName");  
             
           String aMessage = "Welcome to Spring MVC, " + firstName + " " + lastName + "!";  
              
           ModelAndView modelAndView = new ModelAndView("hello_world");  
           modelAndView.addObject("message", aMessage);  
    
           return modelAndView;  
      }  
   
 }

We get the first and last names from the request, and create a message from it.
We create a view "hello_world" and pass it the message.

Note that Spring MVC will redirect to the view /jsp/hello_world.jsp - based on our prefix and suffix configuration in springmvc-servlet.xml.

In your /jsp folder, create a file hello_world.jsp, like this:

 <html>  
 <body>  
      <p>${message}</p>  
 </body>  
 </html>

Build and deploy HelloWorld.war, then point your browser to:
http://localhost:8080/HelloWorld/jsp/registerForm.jsp
to see Spring MVC in action.

Project Confucius

Saturday, February 25, 2012

Spring MVC - Wiring

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