Action如何去使用session request ,application等。。。_action直接连接application-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_36074233/article/details/78311049

package cn.happy.day02servletapi;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ModelDriven;
import com.opensymphony.xwork2.util.ValueStack;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.util.ServletContextAware;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.Map;

/**
 * Created by 张晓宇 on 2017/10/22.
 */
public class LoginAction implements Action,ServletRequestAware,ServletContextAware{

    private HttpServletRequest request;
    private ServletContext servletContext;

    public String execute() throws Exception {
        ActionContext context=ActionContext.getContext();
        Map<String, Object> map = context.getSession();
        //方法一
      /*  map.put("uname","周三");*/

        //方法二
       /* //Session
        HttpSession session = ServletActionContext.getRequest().getSession();
        session.setAttribute("uname","admin_session");
        //Request
        HttpServletRequest request = ServletActionContext.getRequest();
        request.setAttribute("uname","admin_request");
        //ServletContext application
        ServletContext servletContext = ServletActionContext.getServletContext();
        servletContext.setAttribute("uname","admin_content");*/

       //方法三：
        /*HttpSession session = request.getSession();
        session.setAttribute("uname","张三");*/

        //方法四 .五：
        //放入值栈
       /* map.put("uname","周三");
        ValueStack valueStack = ActionContext.getContext().getValueStack();
        valueStack.push(map);
       */
        //方法五：
        HttpServletRequest request = ServletActionContext.getRequest();
        ValueStack vs= (ValueStack)request.getAttribute("struts.valueStack");
        vs.push(map);

        return SUCCESS;
    }


    public void setServletRequest(HttpServletRequest httpServletRequest) {
        this.request=httpServletRequest;
    }

    public void setServletContext(ServletContext servletContext) {
        this.servletContext=servletContext;
    }
}

<%@ taglib prefix="s" uri="/struts-tags" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h2>Welcome</h2>
<!--方法一：-->
<%--<input type="text" value="<c:out value="${uname}" />" />--%>
<!--方法二：-->
<%--<s:property value="#session.uname"></s:property>
<s:property value="#request.uname"></s:property>
<s:property value="#application.uname"></s:property>--%>
<!--方法三：-->
<%--<s:property value="#session.uname"></s:property>--%>
<!--方法四.五：-->
<s:debug/>
<s:property value="#session.uname"></s:property>
<!--或-->
<s:property value="uname"></s:property>
</body>
</html>