I am doing a project in Struts2 where I need of setting a parameter in URL like user parameter in below link. 

I want this parameter to be passed when I click a form submit button and not any links separately. I know how to do this with `<s:url>` but that way I need to create a link instead of form submit. 

Can someone please help me with a code sample how to do this?
I know there's a way to do it with HTML or Struts1 but how to do it with Struts2? If there is a way to do this in `struts.xml`, please explain with an example. 

```
<form action="/example/xyz.action?user=george" method="POST">

```