How can Action class will get access to HttpServletRequest to access data??

[RaviNada Kiran]

Please help me understand this .I am completely new to struts2 version .

I am referring to tutorials but couldn't get this concept. Posted so that i can get help here .
How can Action class will get access to HttpServletRequest to access data??

class NewAction {
public void String execute() throws Exception {
if ( its-ok() ) {
return "login";
}
else {
return "none";
}}}

[Sonny Gill]

Implement RequestAware interface to get access to the request attributes.
To get the actual request object, you can implement ServletRequestAware.

[David Newton]

In general Struts 2 abstracts the request away; the framework populates action properties from request parameters. Assuming the form:

<s:form action="foo">
  <s:textfield key="name"/>
  <s:submit/>
</s:form>

the action would just define a "name" property--no need to access the request:

public class FooAction extends ActionSupport {
    private String name;
    public void setName(String name) { this.name = name; }
    public String execute() {
        log.debug("Enter: name=" + name);
        return SUCCESS;
    }
}

You can access request parameters through a map by implementing ParameterAware if really necessary, but it's usually not.

You can access the HttpServletRequest itself by either implementing ServletRequestAware or using the ServletActionContext static utils. It's relatively rare to need to do either of these, and for obvious reasons it's not recommended.

[RaviNada Kiran]

Thanks sonny and David for your replies.

I doesn't want to extend the ActionSuppourt class to get access to the data .I want to go with the ServletRequestAware interface only.

so for this can i do directly like this ??

 public class NewAction implements ServletRequestAware 
{
   private HttpServletRequest request;
   public void setServletRequest(HttpServletRequest request) {
        this.request = request;
   }
   public String execute() throws Exception {
        // do the work using the request
        return "SUCCESS";
   }
}
   

A single class is sufficient or do i need to use anyother class ??

[David Newton]

You can, but again, it's a bad idea.

[RaviNada Kiran]

David Newton wrote:You can, but again, it's a bad idea.

Then please tell me whats the correct approach ?? I could not understand them .

Do i need to write a separate class again for implementing this Aware interface ??

[David Newton]

The code I provided above is the canonical (normal, usual) way to get at form/request data in Struts 2.

You don't *have* to extend ActionSupport, but you'd have to convince me there's a good reason not to--it provides the validation and localization support needed by nearly any web application.

[Sonny Gill]

As Dave is saying, things are done differently in Struts 2, and for good reasons.

I suggest that you do some more reading on Struts 2 basics.
A good start will be the tutorial and other resources at http://www.struts2.net/.
There is also a free book available at InfoQ - Starting Struts 2.