request.getRealPath("url");//虛擬目錄映射為實(shí)際目錄
request.getRealPath("./");//網(wǎng)頁所在的目錄
request.getRealPath("../");//網(wǎng)頁所在目錄的上一層目錄

request.getContextPath();//應(yīng)用的web目錄的名稱
   如http://localhost:7001/bookStore/  
    /bookStore/      =>  [contextPath]  (request.getContextPath())

獲取Web項(xiàng)目的全路徑
String strDirPath = request.getSession().getServletContext().getRealPath("/");