几种获得request session 的几种方法

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();