struts2 用action操作域对象

• 操作request，session，ServletContext 对象
• 用ServletActionContext 操作

1、代码

Action.java

package work.doudou.Action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class action extends ActionSupport{
    @Override
    public String execute() throws Exception {
        //1.操作request域
            HttpServletRequest request=ServletActionContext.getRequest();
            request.setAttribute("request", "request");
            
            //2.操作session
            HttpSession session=request.getSession();
            session.setAttribute("session", "session");
            
            //3.操作ServletContext域
            ServletContext context=ServletActionContext.getServletContext();
            context.setAttribute("context", "context");
            
            String aa=(String)request.getAttribute("request");
            String bb=(String)session.getAttribute("session");
            String cc=(String)context.getAttribute("context");
            System.out.println(aa+"  "+bb+"  "+cc);
        return "ok";
    }
}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />
    <package name="default" namespace="/" extends="struts-default">
        <action name="action" class="work.doudou.Action.action" method="execute">
            <result name="ok" type="dispatcher">/index.jsp</result>
        </action>
    </package>
</struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>abc</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

2、运行结果

控制台

image.png

浏览器显示结果

image.png