struts2关于request、session跟application

struts2关于request、session和application

1、访问或添加request/session/application属性（此种方式适合仅仅是往3个范围放入属性）

public String execute() {
		//此种方式适合仅仅是往3个范围放入属性
		ActionContext act = ActionContext.getContext();
		act.getApplication().put("app", "application范围");//往ServletContext里放入app
		act.getSession().put("ses", "session范围");//往session里放入ses
		act.put("req", "request范围");//往request里放入req
		act.put("names", Arrays.asList("老张","老王","老于"));//将集合放入
		
		return "success";
	}

引入jstl.jar和standard.jar

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

 ${applicationScope.app }<br>
 ${sessionScope.ses }<br>
 ${requestScope.req }<br>
 ==========================================<br>
 <c:forEach items="${names}" var="name">
 ${name } <br>
 </c:forEach>

2、获取HttpServletRequest/HttpSession/ServletContext/HttpServletResponse对象

方法一：通过ServletActionContext类直接获取（适用获取站点目录下某文件的绝对路径）

public String rsa() {
		//此种方式适合获取站点目录下某文件的绝对路径
		HttpServletRequest request = ServletActionContext.getRequest();
		ServletContext servletContent = ServletActionContext.getServletContext();
		request.setAttribute("req", "请求范围属性");
		request.getSession().setAttribute("ses", "会话范围属性");
		servletContent.setAttribute("app", "应用范围属性");
		System.out.println(servletContent.getRealPath("HelloWorld.java"));//HelloWorld.java的绝对路径
//		HttpServletResponse response = ServletActionContext.getResponse();
		return "success";
	}

方法二：实现指定接口，由struts运行时注入

public class HelloWorldAction implements ServletRequestAware,ServletResponseAware,ServletContextAware {
	private HttpServletRequest request;
	private ServletContext servletContext;
	private HttpServletResponse response;
	@Override
	public void setServletContext(ServletContext ser) {
		this.servletContext = ser;
			
	}
	@Override
	public void setServletResponse(HttpServletResponse rpo) {
		this.response = rpo;
			
	}
	@Override
	public void setServletRequest(HttpServletRequest req) {
		this.request = req;
			
	}
		
	public String rsa() {
		request.setAttribute("req", "请求范围属性");
		request.getSession().setAttribute("ses", "会话范围属性");
		servletContext.setAttribute("app", "应用范围属性");
		return "success";
	}
}

struts2关于request、session跟application

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