struts2获取request,session,application4种方式

第一种，依赖容器获取：

private Map request;

private Map session;

private Map application;

public ActionTest()

{

request=(Map)ActionContext.getContext().get("request");

session=ActionContext.getContext().getSession();

application=ActionContext.getContext().getApplication();

}

第二种，IoC方式，是通过依赖注入方式获取到对象，需要实现相应的接口为RequestAware,SessionAware,ApplicationAware：

private Map<String,Object> request;

private Map<String,Object> session;

private Map<String,Object> application;

public void setRequest(Map<String, Object> request) {

this.request = request;

}

public void setSession(Map<String, Object> session) {

this.session = session;

}

public void setApplication(Map<String, Object> application) {

this.application = application;

}

第三种，获取的是原型：

private HttpServletRequest request;

private HttpSession session;

private ServletContext application;

public ActionTest()

{

request=ServletActionContext.getRequest();

session=request.getSession();

application=session.getServletContext();

}

第四种，通过IoC获取原型，需要实现ServletRequestAware，并且要实现setServletRequest方法：

private HttpServletRequest request;

private HttpSession session;

private ServletContext application;

public void setServletRequest(HttpServletRequest request)

{

this.request=request;

this.session=request.getSession();

this.application=session.getServletContext();

}