Java xml解析两个同名标签

Question

我正在编写代码来解析 xml 文件。我想从中检索国家/地区标签值并将其保存到 String[]。当我尝试这样做时，它只检索一个值。但我在 xml 中重复了两次国家标签。将来它可以是三次或四次等等，这是动态的。这是我的 xml:

<?xml version="1.0"?>
<metadata>
<Country>All Countries</Country>
<Country>US - United States</Country>
</metadata>

这是我的代码:

private static String parseXml(String xmlData)
        throws ParserConfigurationException, SAXException, IOException {
    DocumentBuilder builder = DocumentBuilderFactory.newInstance()
            .newDocumentBuilder();
    InputSource src = new InputSource();
    src.setCharacterStream(new StringReader(xmlData));
    Document doc = builder.parse(src);
    NodeList nodes = doc.getElementsByTagName("metadata");
    Element line = null;
    String cnt = null;
    for (int i = 0; i < nodes.getLength(); i++) {
        Element element = (Element) nodes.item(i);
        NodeList country = element.getElementsByTagName("Country");
        for (int j = 0; j < country.getLength(); j++) {
            if (country != null) {
                System.out.println("Country not null " + country);
                line = (Element) country.item(0);
                if (line != null) {
                    cnt = getCharacterDataFromElement(line);
                }
            }
        }
    }
    return cnt;

}

public static String getCharacterDataFromElement(Element e) {
    Node child = e.getFirstChild();
    if (child instanceof CharacterData) {
        CharacterData cd = (CharacterData) child;
        if (cd != null) {
            return cd.getData();
        }
    }
    return "";
}

Answer 1

您的代码不提供在您的代码中存储国家列表的任何可能性，尽管它遍历所有国家。

以下应该有所帮助(尽管未经测试):更改 String cnt = null;至 List<String> = new ArrayList<String>()而不是

for (int j = 0; j < country.getLength(); j++) {
    if (country != null) {
        System.out.println("Country not null " + country);
        line = (Element) country.item(0);
        if (line != null) {
            cnt = getCharacterDataFromElement(line);
        }
    }
}

以下内容:

if (country != null) {
    System.out.println("Country not null " + country);
    for (int j = 0; j < country.getLength(); j++) {
        line = (Element) country.item(j);
        if (line != null) {
            cnt.add( getCharacterDataFromElement(line));
        }
    }
}