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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="styles.css">
-->
hello <br>
<s:property value="#request.rs"> <br><!-- //通过标签取值-->
<s:property value="#session.ss"> <br>
<s:property value="#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;
}
}
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
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原文地址：http://www.cnblogs.com/sunxun/p/4257407.html
