我嘗試從https://www.nbp.pl/kursy/xml/c001z020102.xml讀取 xml 文件。我添加了帶有數(shù)字的 sout 以觀察進度。public void wypisanie() throws Exception        {            URL url = new URL("https://www.nbp.pl/kursy/xml/c001z020102.xml");            System.out.println("1");            URLConnection urlConnection = url.openConnection();            System.out.println("2");            InputStream in = new BufferedInputStream(urlConnection.getInputStream());            System.out.println("3");            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();            System.out.println("4");            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();            System.out.println("5");            Document doc1 = dBuilder.parse( in );            System.out.println("6");            Element element1 = doc1.getDocumentElement();            System.out.println("7");            NodeList nodes1 = element1.getChildNodes();            System.out.println("8");            for (int i = 0; i < nodes1.getLength(); i++) {                System.out.println("" + nodes1.item(i).getTextContent());            }        }這是結(jié)果：12https://www.nbp.pl/kursy/xml/c001z020102我的目標(biāo)是從此 URL 獲取美元匯率。有人有其他想法我應(yīng)該怎么做？編輯：我嘗試使用像這樣的其他 URL： https ://www.w3schools.com/xml/plant_catalog.xml 并且程序有效。那么“舊”網(wǎng)址有什么問題？ https://www.nbp.pl/kursy/xml/c001z020102.xml“舊”網(wǎng)址的結(jié)果12345C:\Users\user\IdeaProjects\NBP\untitled\abch.dtd (The system cannot find the file specified)