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;  
    }  
}