几种获取request,session方法

struts2中几种获得request，session等对象的方法 
1、通过ActionContext来获得举例代码如下： 

  情况1： 

   ActionContext context = ActionContext.getContext(); 
   Map request = (Map) context.get("request"); 
   Map session = context.getSession(); 
   Map application = context.getApplication(); 

情况2： 

  ActionContext actionContext = ActionContext.getContext(); 
  HttpServletRequest request = (HttpServletRequest) actionContext 
     .get(ServletActionContext.HTTP_REQUEST); 
   HttpSession session = request.getSession(); 
   ServletContext context = (ServletContext) actionContext 
     .get(ServletActionContext.SERVLET_CONTEXT); 



2、通过实现 RequestAware, SessionAware,ApplicationAware等接口来获得，举例代码如下： 

public class LoginAction2 implements Action, RequestAware, SessionAware, 
  ApplicationAware { 

   private Map request; 
   private Map session; 
   private Map application; 

   public void setRequest(Map request) { 
         this.request = request; 
  } 

   public void setSession(Map session) { 
        this.session = session; 
  } 

  public void setApplication(Map application) { 
             this.application = application; 
  } 

｝ 

3、通过ServletActionContext来获得，举例代码如下： 

   // 利用ServletActionContext获得request 
   HttpServletRequest request = ServletActionContext.getRequest(); 
   // 利用request获得session 
   HttpSession session = request.getSession(); 
   // 利用ServletActionContext获得servletContext 
   ServletContext context = ServletActionContext.getServletContext();