struts2访问servletAPI

7.1、通过ActionContext获取

通过该方法操作的对象不是真正的HttpServletRequest、HttpServletResponse，只是ActionContext提供的一个map而已，这样的设计师降低ServletAPI的耦合度。

main.jsp

session = ${sessionScope.session }<br>

application= ${applicationScope.application }<br>

request = ${requestScope.request }

mainAction.java

package com.action;

import com.opensymphony.xwork2.ActionContext;

public class mainAction {

      

      public String execute(){

            

            ActionContext act = ActionContext.getContext();

            //request域中放入数据

            act.put("request", "ccccc");

            //session域中放入数据

            act.getSession().put("session", "aaaaa");

            //application域中放入数据

            act.getApplication().put("application", "bbbbb");

            

            

            return "success";

      }

}

7.2、通过ServletActionContext获取

通过该方法获取到的各种对象就是真正的HttpServletRequest、HttpServletResponse。

main.jsp

session = ${sessionScope.session }<br>

application= ${applicationScope.application }<br>

request = ${requestScope.request }

mainAction.java

package com.action;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

public class mainAction {

      

      public String execute(){

            

             //获取HttpServletRequest

            HttpServletRequest req = ServletActionContext.getRequest();

            req.setAttribute("request", "xxxxx");

            //获取HttpSession

            req.getSession().setAttribute("session", "yyyyy");

            //获取application

            ServletActionContext.getServletContext().setAttribute("application", "zzzzz");

            

            

            return "success";

      }

}

7.3、通过实现特定的接口获取（理解即可）

欢迎大家的提问或纠正。