struts2在action中獲取request、session、application,並傳遞數據
阿新 • • 發佈：2017-05-25
ride b2c 傳遞 sets content context 分享 https fcm
其它和上述不變。然後地址欄中輸入：
假設僅僅是通過request、session、application傳遞數據，則不須要獲取對應的對象也能夠傳遞數據，代碼例如以下：
ScopeAction.java:
package com.itheima.action;
import com.opensymphony.xwork2.ActionContext;
public class ScopeAction {
public String execute() {
/*
* 我們這裏不通過字段(加入setXXX、getXXX方法)傳遞數據，我們想著通過域(request、session、application)
* 傳遞數據。怎麽樣才幹做到呢？struts2採用低侵入式，action與servlet沒有不論什麽關聯，怎麽才幹獲取域並傳遞數據呢，
* 這時就用到了ActionContext類
*/
ActionContext context = ActionContext.getContext();
context.getApplication().put("application", "application域");//通過ServletContext域傳遞數據
context.getSession().put("session", "session域");//通過Session域傳遞數據
context.put("request", "request域");//通過Request域傳遞數據
return "success";
}
}
<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>
=============================================================================================
上述方式沒有獲取到域對象。這裏我們也能夠通過其它方法獲取域對象：
在上述的ScopeAction中加入例如以下方法：
public String doexe() {
HttpServletRequest request = ServletActionContext.getRequest();
request.setAttribute("request", "請求域");
ServletContext context = ServletActionContext.getServletContext();
context.setAttribute("application", "應用域");
HttpSession session = request.getSession();
session.setAttribute("session", "會話域");
// HttpServletResponse response = ServletActionContext.getResponse();
return "success";
}其它和上述不變。然後地址欄中輸入：
===============================================================================================
另外另一種方式就是通過框架註入：
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", "請 求 域");
request.getSession().setAttribute("session", "會 話 域");
servletContext.setAttribute("application", "應 用 域");
return "success";
}
}
struts2.xml:
<action name="scope2Action" class="com.itheima.action.Scope2Action"> <result name="success">/msg.jsp</result> </action>
struts2在action中獲取request、session、application,並傳遞數據