通过多种方式获取作用域并设置的值是否存储在值栈

来源：互联网发布：淘宝店铺上传图片编辑：程序博客网时间：2024/06/04 00:49

测试的为request作用域

<%@ page  pageEncoding="UTF-8"  contentType="text/html; charset=UTF-8"    %><%@ page  import="com.opensymphony.xwork2.ActionContext"    %><%@ page   import="org.apache.struts2.ServletActionContext" %><%@ page   import="javax.servlet.http.HttpServletRequest" %><%@ page   import="com.opensymphony.xwork2.util.ValueStack" %><%@ page   import="java.util.Map" %><%@ taglib prefix="s"  uri="/struts-tags" %><%@ taglib prefix="c"  uri="http://java.sun.com/jstl/core" %><html><head></head><body><% Map request1=(Map)ActionContext.getContext().get("request"); request1.put("gjh1", "gjh1");HttpServletRequest request2 = ServletActionContext.getRequest();request2.setAttribute("gjh2", "gjh2");ValueStack valuestack=ActionContext.getContext().getValueStack();valuestack.setValue("#request.gjh3", "gjh3");ActionContext ctx = ActionContext.getContext();               HttpServletRequest request4 = (HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST);  request4.setAttribute("gjh4", "gjh4");%><h1><%= request1==request2 %></h1><br/><h1><%= request1==request4 %></h1><br/><h1><%= request2==request4 %></h1><br/><h1>${requestScope.gjh1}</h1><br/><h1>${requestScope.gjh2}</h1><br/><h1>${requestScope.gjh3}</h1><br/><h1>${requestScope.gjh4}</h1><br/><h1><s:property value="#request.gjh1"/></h1><br><h1><s:property value="#request.gjh2"/></h1><br><h1><s:property value="#request.gjh3"/></h1><br><h1><s:property value="#request.gjh4"/></h1><br></body></html>

运行结果

这里写图片描述
运行结果表示全部存储在值栈
比较结果不相等是因为request里面封装的是map，而获得的map是直接操作的map，所以比较的结果不相等

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