Struts2中访问HttpServletRequest跟HttpSession

Struts2中访问HttpServletRequest和HttpSession
http://pengfeng.iteye.com/blog/212358

1．非Ioc方式
这种方式主要是利用了com.opensymphony.xwork2.ActionContext类以及ora.apache.struts2.ServletActionContext类，具体的方法如下所示。
获得request对象：
1)．

HttpServletRequest request = ServletActionContext.getRequest ();

2)．

ActionContext ct= ActionContext.getContext();   HttpServletRequest request=(HttpServletRequest)ct.get(ServletActionContext.HTTP_REQUEST);

获得session对象：
在Struts2中底层的session都被封装成了Map类型，我们称之为SessionMap，而平常我们所说的session则是指HttpSession对象，具体的获得方法如下所示。
1)．

Map session=ActionContext.getSession();

2)．

Map session=(Map)ActionContext.getContext().get(ActionContext.SESSION);

得到这个SessionMap之后我们就可以对session进行读写了，如果我们想得到原始的HttpSession可以首先得到HttpServletRequest对象，然后通过request.getSession()来取得原始的HttpSession对象。一般情况下SessionMap已经可以完成所有的工作，我们不必再去强行使用底层的session了。

2．IoC方式
这种方式相对来说变化就比较少了，下面给出代码大家自己看吧：

import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;  import javax.servlet.http.HttpSession;    import org.apache.struts2.interceptor.ServletRequestAware;  import org.apache.struts2.interceptor.ServletResponseAware;  import org.apache.struts2.interceptor.SessionAware;    import com.opensymphony.xwork2.ActionContext;  import com.opensymphony.xwork2.ActionSupport;    public class IoCServlet extends ActionSupport implements SessionAware, ServletRequestAware, ServletResponseAware {      private String message;      private Map att;      private HttpServletRequest request;      private HttpServletResponse response;                public String getMessage() {          return message;              }            publicvoid setSession(Map att) {          this.att = att;      }            publicvoid setServletRequest(HttpServletRequest request) {          this.request = request;      }            publicvoid setServletResponse(HttpServletResponse response) {          this.response = response;      }            @Override      public String execute() {                  att.put("msg", "Hello World from Session!");                    HttpSession session = request.getSession();                    StringBuffer sb =new StringBuffer("Message from request: ");          sb.append(request.getParameter("msg"));          sb.append("<br>Response Buffer Size: ");          sb.append(response.getBufferSize());          sb.append("<br>Session ID: ");          sb.append(session.getId());                    message = sb.toString();          return SUCCESS;      }  }  

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