Springmvc getting HttpServletRequest objects in a normal class

Spring MVC takes 2 steps to get a HttpServletRequest object in a normal class:

1. Add the following configuration in the Web. xml file

<listener>
   	<listener-class>org.springframework.web.context.request.requestcontextlistener </ Listener-class>
</listener>

In the Requestcontextlistener class, there is the following code, where red is labeled as the key code:

public class Requestcontextlistener implements Servletrequestlistener {

...

...

...

public void requestinitialized (Servletrequestevent requestevent) {

if (! ( Requestevent.getservletrequest () instanceof HttpServletRequest)) {

throw new IllegalArgumentException ("");

}

HttpServletRequest request = (HttpServletRequest) requestevent.getservletrequest ();

Servletrequestattributes attributes = new Servletrequestattributes (request);

Request.setattribute (Request_attributes_attribute, ATTRIBUTES);

Localecontextholder.setlocale (Request.getlocale ());

Requestcontextholder.setrequestattributes (attributes);

}

...

...

...

}

public class Servletrequestattributes extends Abstractrequestattributes {

...

...

...

Private final httpservletrequest request;

...

...

...

/**

* Create A new Servletrequestattributes instance for the given request.

* @param request Current HTTP request

*/

Public servletrequestattributes (HttpServletRequest request) {

Assert.notnull (Request, "request must not is null");

This.request = Request;

}

}
2. Get the object in the normal class

HttpServletRequest request = ((servletrequestattributes) requestcontextholder.getrequestattributes ()). Getrequest ();