01.獲取路徑

02.獲取資源流

03.獲取路徑下所有資源的路徑

@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    //得到有碟符的路徑
    String path = getServletContext().getRealPath("/index.jsp");
    System.out.println(path);

    //獲取路徑之後,建立輸入流物件
    InputStream input = getServletContext().getResourceAsStream("/index.jsp");

    //獲取當前路徑下所有資源的路徑
    Set<String> paths = getServletContext().getResourcePaths("WEB-INF");
    System.out.println(paths);
}