struts如何在Action類中操做request,session

　　在servlet中，經過request.getparameter與setparameter來實現後端與前端jsp頁面的數據交互，那麼在struts中，也有幾種方式來操做request,session實現後端與前端的交互。

方法1、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2、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3、使用RequestAware,SessionAware接口

1.實現這兩個接口

public class NewsAction extends ActionSupport implements RequestAware,SessionAware {}

2.定義兩個成員變量

　　 private Map<String,Object> session;
    private Map<String,Object> request;

3.重寫接口中的方法

    @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()方法實現

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;
    }
}