，<form>表单提交
<form action="/user/login_Login.action" method="post" > 
  用户代码：<inputnameinputname="usercode" type="text" ><br> 
  用户密码：<inputnameinputname="userpswd" type="password"><br> 
       <inputtypeinputtype="submit" value="登录"> 
</form> 

<a href="/user/delete.action?usercode=admin" rel="external nofollow" >删除</a>  

<input name="usercode" type="text" > 
Ognl.setValue("usercode",action,"admin");//此时根对象是action 

<inputnameinputname="usercode" type="text" ><br>表单依然是模型对象的属性名称作为参数名称 
Ognl.setValue("usercode",user,"admin");//此时根(栈顶)对象是user对象 

<inputnameinputname="user.usercode" type="text" > 
Ognl.setValue("user.usercode",action,"admin");//此时根对象是action 

ActionContext ac = ActionContext.getContext(); //上下文对象相当于request范围 
HttpServletRequest request =(HttpServletRequest)ac.get(StrutsStatics.HTTP_REQUEST); 
HttpSession session = request.getSession(false); 
ServletContext application = session.getServletContext(); 
ServletContext application = ac.get(StrutsStatics.SERVLET_CONTEXT); 
HttpServletRequest request = ServletActionContext.getRequest(); (推荐使用) 
HttpServletResponse response =ServletActionContext.getResponse(); 
Action类实现ServletRequestAware,或ServletResponseAware (属于侵入性开发方式，不推荐使用) 
private HttpServletRequest request ; //set注入 
private HttpServletResponse response ; 
@Override 
public void setServletRequest(HttpServletRequest request) { //实现该方法，该方法由框架调用，传递参数。 
   this.request= request ; 
} 
@Override 
public void setServletResponse(HttpServletResponse response) { 
  this.response= response ; 
} 

ActionContext ac = ActionContext.getContext(); 
Mapsession = ac.getSession(); 
Mapsession2 =(Map)ac.get("session"); 
Mapsession3=(Map)ac.get(ActionContext.SESSION);     
Mapapplication = ac.getApplication() 
Mapapplication = ac.get(ActionContext.APPLICATION); 
Mapapplication = ac.get("application"); 

ActionContext ac = ActionContext.getContext(); 
ValueStack vs = ac.getValueStack(); 
 Map paramts = ac.getParameters(); 

${requestScope.username } 

<% 
 Stringusername =(String)request.getAttribute("username");//被重写的方法，底层是通过ognl查询值栈中的数据 
 out.print(username); 
%>