05.struts动作类获得ServletAPI

1.使用ServletActionContext获得servletAPI

public class Hello extends ActionSupport{
	public String hello(){
		//获得page域对象 null
		PageContext pageContext = ServletActionContext.getPageContext();
		HttpServletRequest request = ServletActionContext.getRequest();
		HttpServletResponse response = ServletActionContext.getResponse();
		HttpSession session = request.getSession();
		//获得application
		ServletContext servletContext = ServletActionContext.getServletContext();
		System.out.println(pageContext);
		System.out.println(request);
		System.out.println(response);
		System.out.println(session);
		System.out.println(servletContext);
		return super.SUCCESS;
	}
}

2.通过实现接口的方式来获得servletAPI

public class Hello extends ActionSupport implements ServletRequestAware{
	HttpServletRequest request;
	public String hello(){
		System.out.println(request);
		return super.SUCCESS;
	}
	@Override
	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
	}
}