struts2的request,session,application



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”;

}

}

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