HP Integrity NonStop H-Series - Manual (Page 116)

Decoupling View from the Controller
So far, the controller is specifying full path of the view, thereby creating unnecessary dependency
between the controller and the view. Ideally, the view must be mapped using a logical name, so
that the view can be switched without changing the controller.
To decouple the view from the controller, complete the following steps:
1. Modify the EmpInfo-servlet.xml file in the EmpInfo/WebContent/WEB-INF directory
to add the following bean to declare a new ViewResolver entry.
NOTE: By default, XML files open in the XML Editor. The XML Editor has two views:
Design and Source view. Select the Source view.
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
value="org.springframework.web.servlet.view.JstlView">
value="/WEB-INF/jsp/">
After modification, the EmpInfo-servlet.xml file appears as:
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-2.0.xsd">
class="com.hp.empinfo.web.EmployeeController"/>
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
value="org.springframework.web.servlet.view.JstlView">
value="/WEB-INF/jsp/">
value=".jsp">
2. Modify the EmployeeController class EmpInfo/com/hp/empinfo/web/
EmployeeController.java to decouple the controller from view using ViewResolver
, as shown below:
Before modification:
return new ModelAndView("WEB-INF/jsp/insert.jsp", "now", now);
After modification:
return new ModelAndView("insert", "now", now);
After modification, the EmployeeController.java file appears as:
package com.hp.empinfo.web;
import org.springframework.web.servlet.mvc.SimpleFormController;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.IOException;
import java.util.Date;
public class EmployeeController extends SimpleFormController {
protected final Log logger = LogFactory.getLog(getClass());
116 Getting Started with Spring