struts2的request,session,application
1.第一种方法（实现RequestAware,SessionAware, ApplicationAware接口）
这是最常用的一种方法
（1）WebParaAction.java
package com.ru.action;
import java.util.Map;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;
import com.opensymphony.xwork2.ActionSupport;
import com.ru.domain.User;
//实现RequestAware,SessionAware, ApplicationAware接口
public class webpara extends ActionSupport implements RequestAware,
SessionAware, ApplicationAware {
//创建对象，map类型
private Map<String,Object> request;
private Map<String, Object> session;
private Map<String, Object> application;
//接收参数
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
if(user.getName().equals("如")&&user.getPassword().equals("123")){
//调用set方法将属性放到request,session,application里面
request.put("name", user.getName());
session.put("name", user.getName());
application.put("name", user.getName());
return "para";
}else{
return "error";
}
}
//分别实现接口的方法
@Override
public void setRequest(Map<String, Object> request) {
// TODO Auto-generated method stub
this.request=request;
}
@Override
public void setSession(Map<String, Object> session) {
// TODO Auto-generated method stub
this.session=session;
}
@Override
public void setApplication(Map<String, Object> application) {
// TODO Auto-generated method stub
this.application=application;
}
}
（2）webpara.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
//添加struts2标签
<%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'webpara.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>
<h1>这个页面获取request，session，application</h1>
欢迎登录
<h2>通过request用两种方法获取用户名</h2>
<s:property value="#request.name"/>
<%=request.getAttribute("name") %>
<h2>通过session用两种方法获取用户名</h2>
<s:property value="#session.name"/>
<%=session.getAttribute("name") %>
<h2>application用两种方法获取用户名</h2>
<s:property value="#application.name"/>
<%=application.getAttribute("name") %>
<s:debug />
</html>
2.第二种方法（使用构造函数配合ActionContext函数）
package com.ru.action;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.ru.domain.User;
public class WebParaAction extends ActionSupport {
//创建map类型的request，session和application
private Map request1;
private Map session1;
private Map application1;
//从jsp页面获取参数
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
//通过构造函数将属性放入
public WebParaAction() {
request1=(Map)ActionContext.getContext().get("request");
session1=ActionContext.getContext().getSession();
application1=ActionContext.getContext().getApplication();
}
//分别调用构造函数中的函数放入属性
@Override
public String execute() throws Exception {
request1.put("name",user.getName());
session1.put("name", user.getName());
application1.put("name", user.getName());
return "ok";
}
}