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I wonder how servlet works

 
Ranch Hand
Posts: 91
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1)I have a web.xml with this content

<servlet>
<servlet-name>springapp</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>springapp</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>

2) I have a file SpringappController.java

public class SpringappController implements Controller {
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog("SpringappController.class");

private ProductManager prodMan;


public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String now = (new Date()).toString();
logger.info("SpringappController - returning hello view"+now);
Map myModel = new HashMap();
myModel.put("now", now);
myModel.put("products", getProductManager().getProducts());

return new ModelAndView("hello", "model", myModel);
}

public void setProductManager(ProductManager pm) {
prodMan = pm;
}

public ProductManager getProductManager() {
return prodMan;
}


}

My Doubt: In the web.xml <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> is called to handle requests, but indirectly the SpringappController class handles the requests.
How does the servlet container know that SpringappController is the DispatcherServlet?.
 
Marshal
Posts: 67430
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Mac Mac OS X IntelliJ IDE jQuery Java
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Since this seems to be more about Spring than servlets, moved to the frameworks forum.
 
Sheriff
Posts: 14691
16
Eclipse IDE VI Editor Ubuntu
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DispatcherServlet will look for another xml file called [servletname]-servlet.xml (i.e. springapp-servlet.xml)

Look into this file, and you'll propably see some handler mappings, like BeanNameUrlHandlerMapping or SimpleUrlHandlerMapping.
These handlers are responsible for mapping requests to servlets.
 
Ranch Hand
Posts: 15304
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And then look in this file for that and that file for this. And don't forget to map this to that and make sure you have specified the mapping in the correct map or the mapping won't map to the map correctly.

Sorry, couldn't resist. Back to your regularly scheduled coding...
 
Christophe Verré
Sheriff
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You'll get banned from the frameworks forum
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