java - 需要将请求xml拆分成不同的xml

Question

我们有一个请求 xml，并且希望批量处理该请求 xml。

示例 1:

<ApplicationArea>
  ---
  ---
</ApplicationArea>
<DataArea>
<Employ>
  <eno></eno>
  <employName></employName>
</Employ>
<Employ>
  <eno></eno>
  <employName></employName>
</Employ>
<Employ>
  <eno></eno>
  <employName></employName>
</Employ>
<Employ>
  <eno></eno>
  <employName></employName>
</Employ>
<Employ>
  <eno></eno>
  <employName></employName>
</Employ>
<Employ>
  <eno></eno>
  <employName></employName>
</Employ>
</DataArea>

在此请求中，使用记录没有限制。假设请求 xml 中有 1000 个 Employs，在这种情况下我想分成多个 xml，批量大小为 100。我的意思是，想要创建 10 个 xml，每个 xml 包含相同的 <ApplicationArea>但是<DataArea>应仅包含 50 个雇员。

第一个 xml 应包含 1-100 个雇员。第二个 xml 应包含 101-200 个员工

<小时/>

我怎样才能实现这个目标。请提供建议。

最诚挚的问候，拉维

Answer 1

使用此代码(将 xml 的批量大小更改为 100)

public static void splitXML() throws Exception {

    int batchSize = 2;
    List<String> splittedXMLs = new ArrayList<String>();
    String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
            "<RootElement>\n" +
            "   <ApplicationArea>\n" +
            "      <Test />\n" +
            "   </ApplicationArea>\n" +
            "   <DataArea>\n" +
            "      <Employ>\n" +
            "         <eno />\n" +
            "         <employName />\n" +
            "      </Employ>\n" +
            "      <Employ>\n" +
            "         <eno />\n" +
            "         <employName />\n" +
            "      </Employ>\n" +
            "      <Employ>\n" +
            "         <eno />\n" +
            "         <employName />\n" +
            "      </Employ>\n" +
            "      <Employ>\n" +
            "         <eno />\n" +
            "         <employName />\n" +
            "      </Employ>\n" +
            "      <Employ>\n" +
            "         <eno />\n" +
            "         <employName />\n" +
            "      </Employ>\n" +
            "      <Employ>\n" +
            "         <eno />\n" +
            "         <employName />\n" +
            "      </Employ>\n" +
            "   </DataArea>\n" +
            "</RootElement>";
    System.out.println(xml);
    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
    Document doc = dBuilder.parse(new ByteArrayInputStream(xml.getBytes()));


    // This is going to be our base document for new document.
    Document newDoc = dBuilder.newDocument();
    Node importedNode = newDoc.importNode(doc.getDocumentElement(), true);
    newDoc.appendChild(importedNode);

    Element dataAreaElement = (Element) newDoc.getElementsByTagName("DataArea").item(0);
    removeChildren(dataAreaElement);

    Document splittedDoc = (Document) newDoc.cloneNode(true);

    List<Node> employList = new ArrayList<Node>();
    NodeList dataArea = doc.getElementsByTagName("Employ");
    for (int i = 0; i < dataArea.getLength(); i++) {
        employList.add(dataArea.item(i));
        if (i % batchSize == 0 || i == dataArea.getLength() - 1) {
            Node dataAreaNode = splittedDoc.getDocumentElement().getElementsByTagName("DataArea").item(0);
            for (Node node1 : employList) {

                dataAreaNode.appendChild(splittedDoc.importNode(node1, true));
            }
            employList.clear();
            splittedXMLs.add(convertDocumentToString(splittedDoc));
            splittedDoc = (Document) newDoc.cloneNode(true);
        }
    }

    // Printing all splitted XMLs
    for (String splittedXML : splittedXMLs) {
        System.out.println("##### " + splittedXML);
    }

}

public static void removeChildren(Node node) {
    while (node.hasChildNodes())
        node.removeChild(node.getFirstChild());
}

private static String convertDocumentToString(Document doc) {
    TransformerFactory tf = TransformerFactory.newInstance();
    Transformer transformer;
    try {
        transformer = tf.newTransformer();
        // below code to remove XML declaration
        // transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
        StringWriter writer = new StringWriter();
        transformer.transform(new DOMSource(doc), new StreamResult(writer));
        String output = writer.getBuffer().toString();
        return output;
    } catch (TransformerException e) {
        e.printStackTrace();
    }

    return null;
}

我已经为输出 xml 创建了字符串，您可以将其写入文件或执行任何您想要的操作。