servlet中获得tomcat项目相对路径的绝对路径

[code]public class CreateXmlAction extends HttpServlet {

private ServletConfig config;
public void init(ServletConfig config) throws ServletException {
this.config = config;
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String filePath = config.getServletContext().getRealPath("/");
}

}[/code]

或者直接在继承了HttpServlet的Servlet中写：

[code]String filePath=this.getServletConfig().getServletContext().getRealPath("/");[/code]