首页 > 代码库 > Struts2里如何取得request,session,application

Struts2里如何取得request,session,application

2024-11-20 20:06:02   203人阅读

第一种：
取得MAP类型的request,session,application
在java文件里写

package com.xjtu.st; import java.util.Map; import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport; public class LoginAction extends ActionSupport{    private Map request;    private Map session;    private Map application;    public LoginAction(){        request = (Map)ActionContext.getContext().get("request");        session = ActionContext.getContext().getSession();        application = ActionContext.getContext().getApplication();    }         public String execute(){        request.put("rs", "rs");        session.put("ss", "ss");        application.put("as", "as");                 return SUCCESS;    }}

 ActionContext.getContext()是获得Action的上下文，然后可以获得MAP类型的request等
在输出页面可获得参数

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%><%@ taglib uri="/struts-tags" prefix="s" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>                    <title>My JSP ‘MyJsp.<a href="http://www.2cto.com/kf/web/jsp/" target="_blank" class="keylink">jsp</a>‘ 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="http://www.mamicode.com/styles.css">    -->             hello  <br> <s:property value="http://www.mamicode.com/#request.rs"> <br><!--  //通过标签取值-->   <s:property value="http://www.mamicode.com/#session.ss"> <br>   <s:property value="http://www.mamicode.com/#application.as"> <br>   <%=request.getAttribute("rs") %><br><!-- 用原始的方法取值-->     <%=session.getAttribute("ss") %><br>       <%=application.getAttribute("as") %><br>       <!--html></s:property></s:property></s:property>

 第二种：
实现RequestAware,SessionAware,ApplicationAware接口，该方法成为DI（依赖注入）或者IOC(控制反转)。代码如下

package com.xjtu.st; 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.ActionContext;import com.opensymphony.xwork2.ActionSupport; public class LoginAction extends ActionSupport implements RequestAware,SessionAware,ApplicationAware{    private Map request;    private Map session;    private Map application;              public String execute(){        request.put("rs", "rrs");        session.put("ss", "sss");        application.put("as", "aas");                 return SUCCESS;    }     public void setRequest(Map<string, object=""> request) {        // TODO Auto-generated method stub        this.request=request;             }     public void setSession(Map<string, object=""> session) {        // TODO Auto-generated method stub        this.session= session;    }     public void setApplication(Map<string, object=""> application) {        // TODO Auto-generated method stub        this.application = application;    }}</string,></string,></string,>

 前面2种是取得Map类型的,后两种是取得HtteServletRequest，HttpSession,ServletContext类型的办法第三种：

代码如下

package com.xjtu.st; import java.util.Map; import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession; import org.apache.struts2.ServletActionContext;import org.apache.struts2.interceptor.ApplicationAware;import org.apache.struts2.interceptor.RequestAware;import org.apache.struts2.interceptor.SessionAware; import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport; public class LoginAction extends ActionSupport {    private HttpServletRequest request;    private HttpSession session;    private ServletContext application;         public LoginAction(){        request= ServletActionContext.getRequest();        session = request.getSession();        application = session.getServletContext();    }    public String execute(){        request.setAttribute("rs", "rrrs");        session.setAttribute("ss", "ssss");        application.setAttribute("as", "aaas");                 return SUCCESS;    }        }

 

 
 
 
该方法不常用第四种：
也是ioc的方式
代码如下
 
package com.xjtu.st; import java.util.Map; import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession; import org.apache.struts2.ServletActionContext;import org.apache.struts2.interceptor.ApplicationAware;import org.apache.struts2.interceptor.RequestAware;import org.apache.struts2.interceptor.ServletRequestAware;import org.apache.struts2.interceptor.SessionAware; import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport; public class LoginAction extends ActionSupport implements ServletRequestAware{    private HttpServletRequest request;    private HttpSession session;    private ServletContext application;          public String execute(){        request.setAttribute("rs", "rrrrs");        session.setAttribute("ss", "sssss");        application.setAttribute("as", "aaaas");                 return SUCCESS;    }    public void setServletRequest(HttpServletRequest request) {        // TODO Auto-generated method stub        this.request = request;        session = request.getSession();        application = session.getServletContext();             }      }

 

Struts2里如何取得request,session,application


联系
我们