struts2在action中获取request、session、application,并传递数据
浏览数：23 /
时间：2015年06月11日
如果只是通过request、session、application传递数据，则不需要获取相应的对象也可以传递数据，代码如下：
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(添加setXXX、getXXX方法)传递数据，我们想着通过域(request、session、application)
* 传递数据。怎么样才能做到呢？struts2采用低侵入式，action与servlet没有任何关联，怎么才能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：
=============================================================================================
上述方式没有获取到域对象，这里我们也可以通过其他方法获取域对象：
在上述的ScopeAction中添加如下方法：
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";
}其他和上述不变，然后地址栏中输入：
===============================================================================================
另外还有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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