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;
    }
}