struts2中Action中设置和取得request/session/application的方法

struts2中Action取得request/session/application的四种方法  

1. servlet 不相关的 非IoC 取得Request等对象的方式
2. servlet 不相关的 IoC 取得Request等对象的方式
3. servlet 相关的 非IoC 取得Request等对象的方式
4. servlet 相关的 IoC 取得Request等对象的方式

步骤一：struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

    "http://struts.apache.org/dtds/struts-2.0.dtd">

 

<struts>

 

    <package name="default" extends="struts-default">

        <action name="login1" class="struts2.login.Login1Action">

            <result name="success" >result.jsp</result>

        </action>

       

        <action name="login2" class="struts2.login.Login2Action">

            <result name="success" >result.jsp</result>

        </action>

       

        <action name="login3" class="struts2.login.Login3Action">

            <result name="success" >result.jsp</result>

        </action>

       

        <action name="login4" class="struts2.login.Login4Action">

            <result name="success" >result.jsp</result>

        </action>

    </package>

   

</struts>

步骤二：四个类文件

Login1Action.java

package struts2.login;

 

import java.util.Map;

 

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

 

/**

 * servlet 不相关的非IoC

 * @author于祥通

 * 2010-5-31上午10:19:52

 * Login1Action.java

 */

publicclass Login1Action extends ActionSupport {

 

    private ActionContext context;

    private Map request;

    private Map session;

    private Map application;

 

    public String execute() throws Exception {

       this.context = ActionContext.getContext();

       this.request = (Map) this.context.get("request");

       this.session = this.context.getSession();

       this.application = this.context.getApplication();

       this.request.put("att", "request value servlet 不相关的非IoC ");

       this.session.put("att", "session value servlet 不相关的非IoC ");

       this.application.put("att",

              "application value servlet 不相关的非IoC ");

       returnSUCCESS;

    }

}

Login2Action.java

package struts2.login;

 

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;

 

/**

 * servlet 不相关的 IoC

 * @author于祥通

 * 2010-5-31上午10:20:12

 * Login2Action.java

 */

publicclass Login2Action extends ActionSupport implements RequestAware,

       SessionAware, ApplicationAware {

 

    private Map<String,Object> request;

    private Map<String,Object> session;

    private Map<String,Object> application;

 

    public String execute() throws Exception {

       request.put("att","request value servlet 不相关的 IoC ");

       session.put("att","session value servlet 不相关的 IoC ");

       application.put("att","application value servlet 不相关的 IoC ");

       returnSUCCESS;

    }

   

    publicvoid setRequest(Map<String, Object> arg0) {

       this.request=arg0;

      

    }

   

    publicvoid setSession(Map<String, Object> arg0) {

       this.session=arg0;

      

    }

 

    publicvoid setApplication(Map<String, Object> arg0) {

       this.application=arg0;

 

    }

}

 

Login3Action.java

 

package struts2.login;

 

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

 

import org.apache.struts2.ServletActionContext;

 

import com.opensymphony.xwork2.ActionSupport;

 

/**

 * servlet 相关的非IoC

 * @author于祥通

 * 2010-5-31上午10:20:26

 * Login3Action.java

 */

publicclass Login3Action extends ActionSupport {

    private HttpServletRequest request;

    private HttpSession session;

    private ServletContext application;

 

    @Override

    public String execute() throws Exception {

       this.request = ServletActionContext.getRequest();

       this.session = this.request.getSession();

       this.application= ServletActionContext.getServletContext();

      

       this.request.setAttribute("att","request value servlet 相关的非IoC ");

       this.session.setAttribute("att","session value servlet 相关的非IoC ");

       this.application.setAttribute("att","application value servlet 相关的非IoC ");

      

       returnSUCCESS;

    }

}

Login4Action.java

package struts2.login;

 

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

 

import org.apache.struts2.interceptor.ServletRequestAware;

import org.apache.struts2.util.ServletContextAware;

 

import com.opensymphony.xwork2.ActionSupport;

 

/**

 * servlet 相关的 IoC

 * @author于祥通

 * 2010-5-31上午10:20:37

 * Login4Action.java

 */

publicclass Login4Action extends ActionSupport implements ServletRequestAware , ServletContextAware{

 

    private HttpServletRequest request;

    private HttpSession session;

    private ServletContext application;

 

    public String execute() throws Exception {

    this.request.setAttribute("att", "request value servlet 相关的 IoC ");

    this.session = this.request.getSession();

    this.session.setAttribute("att", "session value servlet 相关的 IoC ");

    this.application.setAttribute("att", "application value servlet 相关的 IoC ");

    returnSUCCESS;

    }

   

    publicvoid setServletContext(ServletContext arg0) {

       application=arg0;

    }

 

    publicvoid setServletRequest(HttpServletRequest arg0) {

       request=arg0;

      

    }

}

  

步骤三：jsp页面

getrequest.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<html>

<a href="login1.action">servlet不相关的非IoC 取得Request等对象的方式</a><br>

<a href="login2.action">servlet不相关的 IoC 取得Request等对象的方式</a><br>

<a href="login3.action">servlet相关的非IoC 取得Request等对象的方式</a><br>

<a href="login4.action">servlet相关的 IoC 取得Request等对象的方式</a><br>

</html>

result.jsp

<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>

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

<%

String path = request.getContextPath();

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

%>

 

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

<html>

  <head>

    <basehref="<%=basePath%>">

   

    <title>My JSP 'result.jsp' starting page</title>

   

    <metahttp-equiv="pragma"content="no-cache">

    <metahttp-equiv="cache-control"content="no-cache">

    <metahttp-equiv="expires"content="0">   

    <metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">

    <metahttp-equiv="description"content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

 

  </head>

 

  <body>

  <s:debug></s:debug>

  *****************************取值法一********************************<br/>

  <s:propertyvalue="#request.att"/><br/>

  <s:propertyvalue="#session.att"/><br/>

  <s:propertyvalue="#application.att"/><br/>

  *****************************取值法二********************************<br/>

  <%=request.getAttribute("att") %><br/>

  <%=session.getAttribute("att") %><br/>

  <%=application.getAttribute("att") %><br/>

  *****************************取值法三********************************<br/>

 

request 属性是 ${request.att}<br>

session 属性是 ${session.att}<br>

application 属性是 ${application.att}<br>

  </body>

</html>

 教程学习截图：

第一种方法取到request，session，application.jpg

第二种方法取到request，session，application.jpg

 

第三种方法取到request，session，application.jpg

 

jsp中代码.jpg

 

struts2输出结果1.jpg