【发布时间】：2018-10-23 10:09:19
【问题描述】：
我有一个这样的 xml：
<div class="row mt-5">
<div class="col-lg-cus col-6">
<div class="product-box lazyload-wrap">
<div class="remove-wishlist" data-id="7080">
<i class="fa fa-times" aria-hidden="true"></i>
</div>
<div class="productAvatar">
<a href="/vi/classic-fullface-royal-m18" title="Classic FULLFACE ROYAL M18">
<div class="img img-background text-left origin product-img lazy-bg-img lazyload-item" style="background-image:url('/Uploads/default-image.jpg')" alt="Classic FULLFACE ROYAL M18" data-pil-src="https://fanfan.vn/Uploads/t/fa/fanfan0non-bao-hiem-cafe-racer-classic-fullface-royal-m18-5_0061169_235.jpg">
</div>
</a>
<a class="btn btnQuickView "
onclick="OpenCustomBootstrapModal('/vi/_Details?productId=7080', null, 1000, 'productPopup')">
<span class="txtOutOfStock">Hết hàng</span>
<span class="txtQuickView">Xem nhanh</span>
</a>
</div>
<p class="mb-1 brand-name">
<a href="/vi/royal-helmet" class="a-black" title="ROYAL HELMET">ROYAL HELMET</a>
</p>
<p class="name text-uppercase mb-0">
<a href="/vi/classic-fullface-royal-m18" class="a-black">Classic FULLFACE ROYAL M18</a>
</p>
<div class="rating my-2">
<span class="star-raty" data-score="0" data-readOnly="true"></span>
</div>
<p>
<span>1.100.000 ₫</span>
</p>
</div>
</div>
<div class="col-lg-cus col-6">
<div class="product-box lazyload-wrap">
<div class="remove-wishlist" data-id="6855">
<i class="fa fa-times" aria-hidden="true"></i>
</div>
<div class="productAvatar">
<a href="/vi/non-bao-hiem-34-royal-m01-tem" title="Nón bảo hiểm 3/4 Royal M01 Tem">
<div class="img img-background text-left origin product-img lazy-bg-img lazyload-item" style="background-image:url('/Uploads/default-image.jpg')" alt="Nón bảo hiểm 3/4 Royal M01 Tem" data-pil-src="https://fanfan.vn/Uploads/t/fa/fanfan0mu-non-bao-hiem-3-4-di-xe-may-royal-m01-tem-helmet-with-texture-4-do-xam-red-si_0060108_235.jpg">
</div>
</a>
<a class="btn btnQuickView "
onclick="OpenCustomBootstrapModal('/vi/_Details?productId=6855', null, 1000, 'productPopup')">
<span class="txtOutOfStock">Hết hàng</span>
<span class="txtQuickView">Xem nhanh</span>
</a>
</div>
<p class="mb-1 brand-name">
<a href="/vi/royal-helmet" class="a-black" title="ROYAL HELMET">ROYAL HELMET</a>
</p>
<p class="name text-uppercase mb-0">
<a href="/vi/non-bao-hiem-34-royal-m01-tem" class="a-black">Nón bảo hiểm 3/4 Royal M01 Tem</a>
</p>
<div class="rating my-2">
<span class="star-raty" data-score="0" data-readOnly="true"></span>
</div>
<p>
<span>400.000 ₫</span>
</p>
</div>
</div>
我试图解析它们，从中获取一些数据并将它们解析到 jaxb，我是这样做的：
public static void fetchFanFanData(String dataFilePath, String type) {
try {
Document doc = DocParser(dataFilePath);
XPath xpath = getXPath();
String query = "//div[@class=\"col-lg-cus col-6\"]";
NodeList list = (NodeList) xpath.evaluate(query, doc, XPathConstants.NODESET);
NodeList list = doc.getDocumentElement().getChildNodes();
System.out.println(list.getLength());
Products products = new Products();
for (int i = 0; i < list.getLength(); i++) {
Node node = list.item(i);
String url = xpath.evaluate("//p[@class=\"name text-uppercase mb-0\"]/a/@href", node, XPathConstants.STRING).toString();
String name = xpath.evaluate("//p[@class=\"name text-uppercase mb-0\"]/a", node, XPathConstants.STRING).toString();
String producer = xpath.evaluate("//p[@class=\"mb-1 brand-name\"]", node, XPathConstants.STRING).toString();
String image_url = xpath.evaluate("//div[@class=\"productAvatar\"]/a/div/@data-pil-src", node, XPathConstants.STRING).toString();
String price = xpath.evaluate("//p/span", node, XPathConstants.STRING).toString();
Product product = new Product();
product.setName(name);
product.setImage(image_url);
product.setUrl(url);
product.setPrice(price);
product.setProducer(producer);
product.setStore("FanFan");
product.setType(type);
products.getProduct().add(product);
}
marshallJAXB(products, dataFilePath);
} catch (ParserConfigurationException | SAXException | IOException | XPathExpressionException | JAXBException ex) {
Logger.getLogger(XMLUtilities.class.getName()).log(Level.SEVERE, null, ex);
}
}
private static void marshallJAXB(Products products, String path) throws JAXBException, FileNotFoundException {
JAXBContext context = JAXBContext.newInstance(Products.class);
Marshaller m = context.createMarshaller();
m.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
m.marshal(products, new File(ServletActionContext.getServletContext().getRealPath("/" + "WEB-INF\\result.xml")));
}
public static XPath getXPath() {
XPathFactory factory = XPathFactory.newInstance();
XPath xPath = factory.newXPath();
return xPath;
}
public static Document DocParser(String filePath)
throws ParserConfigurationException, SAXException, IOException {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(filePath);
return doc;
}
marshaller 只是验证 jaxb 是否正确，但我得到的始终是这样的第一个节点：
<products xmlns="http://www.example.org/product">
<product type="helmet">
<name>Classic FULLFACE ROYAL M18</name>
<url>/vi/classic-fullface-royal-m18</url>
<image>https://fanfan.vn/Uploads/t/fa/fanfan0non-bao-hiem-cafe-racer-classic-fullface-royal-m18-5_0061169_235.jpg</image>
<price>1.100.000 ₫</price>
<producer>ROYAL HELMET</producer>
<store>FanFan</store>
</product>
<product type="helmet">
<name>Classic FULLFACE ROYAL M18</name>
<url>/vi/classic-fullface-royal-m18</url>
<image>https://fanfan.vn/Uploads/t/fa/fanfan0non-bao-hiem-cafe-racer-classic-fullface-royal-m18-5_0061169_235.jpg</image>
<price>1.100.000 ₫</price>
<producer>ROYAL HELMET</producer>
<store>FanFan</store>
</product>
<product type="helmet">
<name>Classic FULLFACE ROYAL M18</name>
<url>/vi/classic-fullface-royal-m18</url>
<image>https://fanfan.vn/Uploads/t/fa/fanfan0non-bao-hiem-cafe-racer-classic-fullface-royal-m18-5_0061169_235.jpg</image>
<price>1.100.000 ₫</price>
<producer>ROYAL HELMET</producer>
<store>FanFan</store>
</product>
我尝试了很多方法，但现在没有希望了。有谁知道为什么？请帮忙。 尽管我在特定上下文中使用它们，但我无法找出 xpath 在这种情况下的工作原理？
【问题讨论】：