struts2在action中获取request、session、application,并传递数据

时间：2023-04-19 23:50:20

假设仅仅是通过request、session、application传递数据，则不须要获取对应的对象也能够传递数据，代码例如以下：

ScopeAction.java:

package com.itheima.action;

import com.opensymphony.xwork2.ActionContext;

public class ScopeAction {

	public String execute() {

		/*

		 * 我们这里不通过字段(加入setXXX、getXXX方法)传递数据，我们想着通过域(request、session、application)

		 * 传递数据。怎么样才干做到呢？struts2採用低侵入式，action与servlet没有不论什么关联，怎么才干获取域并传递数据呢，

		 * 这时就用到了ActionContext类

		 */

		ActionContext context = ActionContext.getContext();

		context.getApplication().put("application", "application域");//通过ServletContext域传递数据

		context.getSession().put("session", "session域");//通过Session域传递数据

		context.put("request", "request域");//通过Request域传递数据

		return "success";

	}

}

struts2.xml:

<action name="scopeAction_*" class="com.itheima.action.ScopeAction" method="{1}">

     <result name="success">/msg.jsp</result>

</action>

msg.jsp:

<%@ page language="java" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>Insert title here</title>

</head>

<body>

	${applicationScope.application }<br/>

	${sessionScope.session }<br/>

	${requestScope.request }<br/>

</body>

</html>

地址栏：

struts2在action中获取request、session、application,并传递数据

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=============================================================================================

上述方式没有获取到域对象。这里我们也能够通过其它方法获取域对象：

在上述的ScopeAction中加入例如以下方法：

public String doexe() {

		HttpServletRequest request = ServletActionContext.getRequest();

		request.setAttribute("request", "请求域");

		ServletContext context = ServletActionContext.getServletContext();

		context.setAttribute("application", "应用域");

		HttpSession session = request.getSession();

		session.setAttribute("session", "会话域");

//		HttpServletResponse response = ServletActionContext.getResponse();

		return "success";

	}

其它和上述不变。然后地址栏中输入：

struts2在action中获取request、session、application,并传递数据

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===============================================================================================

另外另一种方式就是通过框架注入：

Scope2Action.java:

package com.itheima.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;

public class Scope2Action implements ServletRequestAware, ServletResponseAware, ServletContextAware{

	private HttpServletRequest request;

	private HttpServletResponse response;

	private ServletContext servletContext;

	@Override

	public void setServletContext(ServletContext arg0) {

		this.servletContext = arg0;

	}

	@Override

	public void setServletResponse(HttpServletResponse arg0) {

		this.response = arg0;

	}

	@Override

	public void setServletRequest(HttpServletRequest arg0) {

		this.request = arg0;

	}

	public String execute() {

		request.setAttribute("request", "请 求 域");

		request.getSession().setAttribute("session", "会 话 域");

		servletContext.setAttribute("application", "应 用 域");

		return "success";

	}

}

struts2.xml:

<action name="scope2Action" class="com.itheima.action.Scope2Action">

	<result name="success">/msg.jsp</result>

</action>

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