Struts值栈与Ognl

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配置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>          <package name="stack" namespace="/stack" extends="struts-default">                   <action name="stack_*" class="star.july.c_valuestack.StackAction" method="{1}">                             <result name="success">/index.jsp</result>                             <result name="input">/add.jsp</result>                   </action>          </package> </struts>

StackAction：

package star.july.c_valuestack;import java.util.Map;import star.july.b_validation.Student;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.util.ValueStack;public class StackAction extends ActionSupport{          Student student;          public Student getStudent() {                   return student;          }          public void setStudent(Student student) {                   this.student = student;          }                    public String stack(){                   String name = student.getName();                   ActionContext ac = ActionContext.getContext();                   //使用对象栈存储对象                   //获取值栈，用list的栈方式存取                   ValueStack vs = ac.getValueStack();                   //将对象放入栈中，压栈                   vs.push(student);                   //弹栈          //       vs.pop();                                                         //使用映射栈存取对象                   //添加自己的值和栈                   Map map = ac.getContextMap();                   map.put("map", "自定义");                   //获取request                   Map rp = (Map)ac.get("request");                   rp.put("rp", "请求");                   //获取session                   Map sp = ac.getSession();                   sp.put("sp", "会话");                   //获取application并赋值                   Map ap = ac.getApplication();                   ap.put("ap", "应用");                                      System.out.println(student);                   return SUCCESS;          }}

输入值：

 <body>  <s:fielderror></s:fielderror>  <form action="<c:url value='/stack/stack_stack'/>" method="post">          用户名：<input type="text" name="student.name"><br>          <input type="submit" value="提交"/>            </form>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib uri="/struts-tags" prefix="s"  %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">       <title>My JSP 'index.jsp' starting page</title>          <meta http-equiv="pragma" content="no-cache">          <meta http-equiv="cache-control" content="no-cache">          <meta http-equiv="expires" content="0">             <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">          <meta http-equiv="description" content="This is my page">          <!--          <link rel="stylesheet" type="text/css" href="styles.css">          -->  </head>   <body>  <!-- 对象栈的取方式，用[] -->  <!-- 取出方式，从下表开始一直取到结束为止 -->  对象栈的取方式，用[]  <s:property value="[1]"/><br>  <s:property value="[0]"/><br><br><br>  <!-- 映射栈的取值方式，前面加# -->  映射栈的取值方式，前面加#<br>  <s:property value="#map"/><br>  <s:property value="#request.rp"/><br>  <s:property value="#session.sp"/><br>  <s:property value="#application.ap"/>  <!-- 调试值栈，看值 -->  <s:debug></s:debug>  </body></html>

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