struts2教程：13、访问或添加request/session/application属性

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访问或添加request/session/application属性

struts2避免了直接访问servletAPI，所以没法获取request/session/application对象，但对他们进行了封装。

public String scope() throws Exception{

ActionContextctx =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>

应用场景：仅仅是为了访问或添加属性用ActionContext

获取HttpServletRequest /HttpSession /ServletContext /HttpServletResponse对象

方法一，通过ServletActionContext.类直接获取：（建议使用，因为简单）

public String rsa() throws Exception{

HttpServletRequest request =ServletActionContext.getRequest();

ServletContextservletContext =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 implementsServletRequestAware,ServletResponseAware,ServletContextAware{

private HttpServletRequest request;

private ServletContextservletContext;

private HttpServletResponse response;

public void setServletRequest(HttpServletRequestreq) {

this.request=req;

}

public void setServletResponse(HttpServletResponse res) {

this.response=res;

}

public void setServletContext(ServletContext ser) {

this.servletContext=ser;

}

应用场景：比如果要获取站点目录下的真实路径，用ServletActionContext