小编use*_*895的帖子

我想得到tag2的值,我得到了一个xml:

String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
            "<ns1:schema xmlns:ns1='http://example.com'>" +
                "<ns1:tag1>" +
                "    <ns1:tag2>value</ns1:tag2>" +
                "</ns1:tag1>" +
            "</ns1:schema>"; 

然后将其解析为文档,并希望通过tagnameNS获取元素.但是当我运行这个时,nodelist为空为什么？

DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
        docBuilderFactory.setNamespaceAware(true);
        DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
        Document doc = docBuilder.parse(new InputSource(new StringReader(xml))); 

        NodeList nl = doc.getElementsByTagNameNS("http://example.com", "tag2");

        String a = nl.item(0).getNodeValue();

仍然无法使用URI.