java - 如何检索/提取XML元素属性值

我有一个类似以下的XML，

<?xml version="1.0" encoding="utf-8"?>
    <PaymentElement>
        <Payment seqID="3">
            <TPayment>
                <Status>status</Status>
            </TPayment>
        </Payment>
    </PaymentElement>

问题是我如何通过java检索/提取seqID值，该值为3。

我尝试了以下方法，但是没有用。

InputStream xml = conn.getInputStream();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(xml);
NodeList list = doc.getElementsByTagName("PaymentElement");

for(int i=0; i<=list.getLength();i++){
    NodeList paySeq=doc.getElementsByTagName("Payment seqID");
System.out.println("Payment seqID"+paySeq);
}

最佳答案

尝试

    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    Document doc = db.parse(new File("1.xml"));
    Element e  = (Element)doc.getDocumentElement().getElementsByTagName("Payment").item(0);
    String id = e.getAttribute("seqID");
    System.out.println("Payment seqID = " + id);

输出

 Payment seqID = 3