Struts2 ActionContext（二十四）-CSDN博客

本文链接：https://blog.csdn.net/luobing_csdn/article/details/66969185

1.在web中需要访问的Servlet API 是HttpServletRequest,HttpServletSession,ServletContext 这3个类代表了JSP的内置对象的request session application

下面是间接访问Srevlet API（后一章会直接访问Servlet API）
2.ActionContext类
创建实例化对象是
ActionContext ac=ActionContext.getContext();
在ActionContext中有一些常用的方法：
Map getApplication();
Map getParameters();
Map getSession()
void setAppliaction(Map application)

3.action.java


package com.sh.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
	private String loginName;
	private String loginPassword;

	public String checkLogin(){
		ActionContext ac=ActionContext.getContext();
		Map app=ac.getApplication();
		ac.getSession().put("login", this.loginName);
		ac.getApplication().put("login",this.loginName);
		return SUCCESS;
	}

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> 
    <package name="/user" extends="struts-default">
    	<action name="loginAction" class="com.sh.action.LoginAction" method="checkLogin">
    		<result>/index.jsp</result>
    	</action>
    </package>
</struts>


 <body>
    <center>
    	<s:form action="loginAction" method="post">
    		<s:textfield name="loginName" label="loginName" />
    		<s:textfield name="loginPassword" label="loginPassword"/>    	
    		<s:submit key="loginBtn"/>
    		<s:token/>
    	</s:form>
    
    </center>
  </body>

index.jsp


  <body>
   读取session中的信息 <s:property value="#session.login"/>
 读取application中的信息<s:property value="#application.login"/>
  </body>