struts2中幾種獲得request，session等對象的方法

1、通過ActionContext來獲得舉例代碼如下：

  情況1：

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

 情況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、通過實現 RequestAware, SessionAware,ApplicationAware等介面來獲得，舉例代碼如下：

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、通過ServletActionContext來獲得，舉例代碼如下：

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