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Struts2中访问和添加request、session、application属性
public String execute() {// 如果仅仅往这三个范围放入属性，建议使用这种方法
ActionContext actionContext = ActionContext.getContext();
// 往ServletContext里放application
actionContext.getApplication().put("application", "application应用范围");
actionContext.getSession().put("session", "session应用范围");
actionContext.put("request", "request应用范围");
actionContext.put("hobbies", Arrays.asList("羽毛球", "篮球", "足球", "兵乓球"));
return "success";
}打印输出
${applicationScope.application }<br>
${sessionScope.session }<br>
${requestScope.request }<br>
如果相应的属性参数是对象呢？
获取HttpServletRequest/HttpSession/ServletContext/HttpServletResponse对象有两种方法：
方法一、通过ServletActionContext类直接获取：
public String rsa() throws Exception{
HttpServletRequest request=ServletActionContext.getRequest();
ServletContext servletContext=ServletActionContext.getServletContext();
request.getSession();
HttpServletResponse response=ServletActionContext.getResponse();
return "scope";
}方法二、实现指定接口，由struts框架运行时注入:
public class HelloWorldAction implements ServletRequestAware,ServletResponseAware,ServletContextAware{
private HttpServletRequest request;
private ServletContext servletContext;
private HttpServletResponse response;
public void setServletRequest(HttpServletRequest req){
this.request=req;//在运行期由框架注入，不是由自己设置
}
public void setServletResponse(HttpServletResponse res){
this.response=res;
}
public void setServletContext(ServletContext ser){
this.servletContext=ser;
}
}一般建议第一种方法，比较简单完整代码
<?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="csdn" namespace="/ask" extends="struts-default">
<action name="msg" class="struts2.example.action.HelloWorldAction" method="execute">
<!-- 定义处理结果与视图资源之间的关系 -->
<result name="success">/WEB-INF/page/showInfo.jsp</result>
</action>
</package>
</struts>package struts2.example.action;
import java.util.Arrays;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
public class HelloWorldAction {
public String execute() {// 如果仅仅往这三个范围放入属性，建议使用这种方法
ActionContext actionContext = ActionContext.getContext();
// 往ServletContext里放application
actionContext.getApplication().put("application", "application应用范围");
actionContext.getSession().put("session", "session应用范围");
actionContext.put("request", "request应用范围");
actionContext.put("hobbies", Arrays.asList("羽毛球", "篮球", "足球", "兵乓球"));
return "success";
}
public String rsa() throws Exception {
HttpServletRequest request = ServletActionContext.getRequest();// 得到原始的request对象
// request.getRealPath(path); 得到站点目录上某个文件的绝对路径
ServletContext servletContext = ServletActionContext
.getServletContext();
request.setAttribute("request", "*********request应用范围******");
request.getSession().setAttribute("session",
"*********session应用范围********");
// HttpServletResponse response = ServletActionContext.getResponse();
servletContext.setAttribute("application",
"********application应用范围********");
return "success";
}
}
<pre name="code" class="html"><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>My JSP 'showInfo.jsp' starting page</title>
</head>
<body>
${applicationScope.application }<br>
${sessionScope.session }<br>
${requestScope.request }<br>
=============================<br>
<c:forEach items="${hobbies }" var="hobby">
${hobby}<br>
</c:forEach>
</body>
</html>
My Eclipse在Java EE5以后把jstl集成进来，不用在导入jstl相应的jar包
Struts2之访问和添加request、session、application属性
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原文地址：http://blog.csdn.net/lindonglian/article/details/46559769
