①   、和Servlet API 耦合的方式：可以访问更多的Servlet API对象 ，且可以调用其原生的方法。

使用 ServletActionContext 类，

实现 ServletXxxAware 接口。

Struts.xml

<struts>

    <package name="default" namespace="/" extends = "struts-default">

       <action name="TestActionContext" class="com.atguigu.struts2.action.TestActionContextAction">

           <result>/test-actionContext.jsp</result>

       </action>

      

       <action name="TestAware" class="com.atguigu.struts2.action.TestAwareAction">

           <result>/test-aware.jsp</result>

       </action>

      

       <action name="TestServletActionContext" class="com.atguigu.struts2.action.TestServletActionContextAction">

           <result>/success.jsp</result>

       </action>

      

       <action name="TestServletAware" class="com.atguigu.struts2.action.TestServletAwareAction">

           <result>/success.jsp</result>

       </action>

    </package>

</struts>

 

TestServletActionContextAction.java

package com.atguigu.struts2.action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

public class TestServletActionContextAction {
 public String execute(){
  /**
   * ServletActionContext:可以获取到当前Action对象需要的一切Servlet API
   * 相关的对象
   * 常用的方法:
   * 1.获取HttpServletRequest ：ServletActionContext.getRequest();
   * 2.获取HttpSession : ServletActionContext.getRequest().getSession();
   * 3.获取ServletContext(这就是application) :  ServletActionContext.getServletContext();
   */
  HttpServletRequest request = ServletActionContext.getRequest();
  HttpSession session = request.getSession();
  request.getContextPath();
  //这个就是application对象
  ServletContext servletContext = ServletActionContext.getServletContext();
  servletContext.setAttribute("servletContext", "application");
  System.out.println("execute");
  return "success";
  //contextpath 环境上下文路径：request.getContextPath();
  //servletpath 小程序路径：request.getServletPath();
  //ServletContext  小程序上下文  即为application对象 :
  //ServletActionContext.getServletContext();
 }
}

 

TestServletAwareAction.java

package com.atguigu.struts2.action;

 

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

import org.apache.struts2.interceptor.ServletRequestAware;

import org.apache.struts2.interceptor.ServletResponseAware;

import org.apache.struts2.util.ServletContextAware;

 

/**

 *通过实现ServletXxxAware接口的方式 可以由Struts2 注入需要的

 *Servlet 相关的对象

 *

 * ServletRequestAware :注入HttpServletRequest对象（比较常用）

 * ServletContextAware : 注入ServletContext对象（比较常用）

 * ServletResponseAware : 注入HttpServletResponse对象

 *

 */

public class TestServletAwareAction implements ServletRequestAware ,ServletContextAware

,ServletResponseAware{

 

    public void setServletRequest(HttpServletRequest arg0) {

       System.out.println(arg0);

      

    }

    private ServletContext context ;

    public void setServletContext(ServletContext context) {

       System.out.println(context);

       this.context = context;

    }

 

    public void setServletResponse(HttpServletResponse response) {

       System.out.println(response);

    }

    public String execute(){

       return "success";

    }

}

 

 

 

Index.jsp

<body>

    <a href ="TestActionContext.action?name=atguigu">Test ActionContext</a>

    <br/>

    <br/>

    <a href ="TestAware.action?name=atguigu">Test Aware</a>

    <br/>

    <br/>

    <a href="TestServletActionContext">TestServletActionContext</a>

    <br/>

    <br/>

    <a href="TestServletAware.action">TestServletAware</a>

   

    <%

    if(application.getAttribute("date") == null)

       application.setAttribute("date",new Date());

   

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

    %>

  </body>