【Struts2学习笔记(8)】访问或添加request/session/application属性获取HttpServletRequest / HttpSession / ServletContex


(1)访问或添加request/session/application属性

public String scope() throws Exception{
   ActionContext ctx = ActionContext.getContext();
   ctx.getApplication().put("app", "应用范围");//往ServletContext里放入app
   ctx.getSession().put("ses", "session范围");//往session里放入ses
   ctx.put("req", "request范围");//往request里放入req
   return "scope";
}
JSP:
 <body>
    ${applicationScope.app} <br>
    ${sessionScope.ses}<br>
    ${requestScope.req}<br>
 </body>


(2)获取HttpServletRequest / HttpSession / ServletContext / HttpServletResponse对象

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;
	}
	public void setServletResponse(HttpServletResponse res) {
		this.response=res;
	}
	public void setServletContext(ServletContext ser) {
		this.servletContext=ser;
	}
}





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