struts如何在Action类中操作request,session

　　在servlet中，通过request.getparameter与setparameter来实现后端与前端jsp页面的数据交互，那么在struts中，也有几种方式来操作request,session实现后端与前端的交互。

方法一、利用ActionContext.getContext().get("request");

Map<String,Object> request = (Map<String,Object>)ActionContext.getContext().get("request");

request.put(key, value);

request.get("key");

Map<String,Object> session = ActionContext.getContext().getSession();

session.put(key, value);

session.get(key);

方法二、使用ServletActionContext.getRequest();

HttpServletRequest request = ServletActionContext.getRequest();

request.setAttribute(arg0, arg1);

request.getAttribute(arg0)

HttpServletRequest req = ServletActionContext.getRequest();

HttpSession session = req.getSession();

session.setAttribute(arg0, arg1);

session.getAttribute(arg0);

方法三、使用RequestAware,SessionAware接口

1.实现这两个接口

public class NewsAction extends ActionSupport implements RequestAware,SessionAware {}

2.定义两个成员变量

　　 private Map<String,Object> session;

    private Map<String,Object> request;

3.重写接口中的方法

    @Override

    public void setRequest(Map<String, Object> arg0) {

        this.request = arg0;

    }

    @Override

    public void setSession(Map<String, Object> arg0) {

        // TODO Auto-generated method stub

        this.session = arg0;

    }    

4.使用session.put(),session.get(),request.put(),request.get()方法实现

public class NewsAction extends ActionSupport implements RequestAware,SessionAware {

    private Map<String,Object> session;

    private Map<String,Object> request;

　　@Override

    public void setRequest(Map<String, Object> arg0) {

        this.request = arg0;

    }

    @Override

    public void setSession(Map<String, Object> arg0) {

        // TODO Auto-generated method stub

        this.session = arg0;

    }

}