Struts2 ActionContext(二十四)
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2022-05-18 12:13:21
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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
struts.xml
login.jsp
index.jsp
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>
login.jsp
<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>