4.访问web元素[1]，容器获取

来源：互联网发布：大数据在电商中的应用编辑：程序博客网时间：2024/04/30 23:53

struts.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>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<package name="login" namespace="/login" extends="struts-default">
<action name="login*"
class="com.example.struts.action.LoginAction{1}">
<result >
/success.jsp
</result>
</action>
</package>
</struts>

LoginAction1

package com.example.struts.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction1 extends ActionSupport{

private Map request; //类型是Map=【key】加【value】的组合

private Map session;

private Map application;

public LoginAction1(){ //必须加上public，否则在action调用该类时不可以执行该构造函数

request=(Map)ActionContext.getContext().get("request");

//ActionContext.getContext()，获取当前环境

session= ActionContext.getContext().getSession();

application= ActionContext.getContext().getApplication();

}

public String execute() {

request.put("r1", "r1"); //（key，value）

session.put("s1", "s1");

application.put("a1","a1");

return SUCCESS;

}

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

</head>

<body>

用户名： <input type="text" name="name"/>

密码：<input type="text" name="password"/>

<br/>

// onClick="指定传入action"

</form>

</body>

</html>

success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<%@taglib uri="/struts-tags" prefix="s" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

</head>

<body>

<s:property value="#request.r1"/>|<%=request.getAttribute("r1") %><br>

<s:property value="#session.s1"/>|<%=session.getAttribute("s1") %><br>

<s:property value="#application.a1"/>|<%=application.getAttribute("a1") %><br>

//#application.a1意思是

//Stack Context

//These items are available using the #key notation

//必须加#才可以访问

Stack Context的内容

//web也可以访问，原因是把struts的内容也复制到了web中。

也就是<%=request.getAttribute("r1") %>也有值。

<s:debug></s:debug>

</body>

</html>

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运行结果：

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原来说明：

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