提取 XML 标记之间的内容

Question

我有这个 XML 文件：

<ApiHeader>
    <OperationName>findEntitiesResponse</OperationName>
</ApiHeader>
<ResponseHeader>
    <CompletedSuccessfully>true</CompletedSuccessfully>
</ResponseHeader>
<Page>
    <StartAtRow>0</StartAtRow>
    <MaxRows>999999</MaxRows>
    <TotalRowCount>44</TotalRowCount>
</Page>
<Entity>
    <Carrier>xd
        <Id>11460</Id>
        <CarrierCode>11460</CarrierCode>
        <CarrierDescription>11460 LOGIS COUTTER</CarrierDescription>
        <LanguageCode>en</LanguageCode>
        <LanguageCodeDescr>Inglés</LanguageCodeDescr>
        <CarrierTypeCode>GENERAL</CarrierTypeCode>
        <CarrierTypeCodeDescr>GENERAL</CarrierTypeCodeDescr>
        <SCACCode>Default</SCACCode>
        </Memo>
    </Carrier>
</Entity>
<Entity>

有很多<Entitiy>CONTENT</Entity>就像示例中的那个，但我保持简单。

我要做的是提取<Entity></Entity> 标记之间的所有内容。 我做了很多研究，但我发现最接近的是从 just one 标签中提取内容。

结果会是这样的

<Entity>
    <Carrier>xd
        <Id>11460</Id>
        <CarrierCode>11460</CarrierCode>
        <CarrierDescription>11460 LOGIS COUTTER</CarrierDescription>
        <LanguageCode>en</LanguageCode>
        <LanguageCodeDescr>Inglés</LanguageCodeDescr>
        <CarrierTypeCode>GENERAL</CarrierTypeCode>
        <CarrierTypeCodeDescr>GENERAL</CarrierTypeCodeDescr>
        <SCACCode>Default</SCACCode>
        </Memo>
    </Carrier>
</Entity>

请记住，可能有一个或多个<Entity></Entity> 标签。

非常感谢。

编辑

`公共类 ReadXMLFile { 私有最终静态字符串文件路径="C:\Users\AGOJSO\Desktop\jordi\test.xml";

public static void main(String[] args) {
    printXml();
}
public static void printXml() {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    try (InputStream in = new FileInputStream(filepath)) {
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(in);
        NodeList list = filterNodesByXPath(doc, "//root/Entity");
        for (int i = 0; i < list.getLength(); i++) {
            Node node = list.item(i);
            printNode(node);
        }
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

private static NodeList filterNodesByXPath(Document doc, String xpathExpr) {
    try {
        XPathFactory xPathFactory = XPathFactory.newInstance();
        XPath xpath = xPathFactory.newXPath();
        XPathExpression expr = xpath.compile(xpathExpr);
        Object eval = expr.evaluate(doc, XPathConstants.NODESET);
        return (NodeList) eval;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

private static void printNode(Node node) throws TransformerFactoryConfigurationError, TransformerException {
    Transformer transformer = TransformerFactory.newInstance().newTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
    StreamResult result = new StreamResult(new StringWriter());
    DOMSource source = new DOMSource(node);
    transformer.transform(source, result);
    String xmlString = result.getWriter().toString();
    System.out.println(xmlString);
}

} `

它没有打印任何错误，因为它似乎什么也没做。

Answer 1

你可以用旧的好方法来做。

1. 将 XML 读取到 DOM
2. 使用 XPath 提取适当的部分
3. 打印出来......或做任何你喜欢的事情

代码：

@Test
public void printXml() {
    String yourSampleFile = "52720162.xml";
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    try (InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(yourSampleFile)) {
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(in);
        NodeList list = filterNodesByXPath(doc, "//root/Entity");
        for (int i = 0; i < list.getLength(); i++) {
            Node node = list.item(i);
            printNode(node);
        }
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

private NodeList filterNodesByXPath(Document doc, String xpathExpr) {
    try {
        XPathFactory xPathFactory = XPathFactory.newInstance();
        XPath xpath = xPathFactory.newXPath();
        XPathExpression expr = xpath.compile(xpathExpr);
        Object eval = expr.evaluate(doc, XPathConstants.NODESET);
        return (NodeList) eval;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

private void printNode(Node node) throws TransformerFactoryConfigurationError, TransformerException {
    Transformer transformer = TransformerFactory.newInstance().newTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
    StreamResult result = new StreamResult(new StringWriter());
    DOMSource source = new DOMSource(node);
    transformer.transform(source, result);
    String xmlString = result.getWriter().toString();
    System.out.println(xmlString);
}

可以在以下位置找到某种通用形式：How to read XML using XPath in Java