java - 创建具有多个子元素的 XML 文件

Question

我有 ArrayList 对象中的 XML 元素的值。我必须创建具有以下结构的 XML 文件，其中元素带有子节点。

编号、名称和级别分别添加到数组列表对象alNumber、alName 和alLevel 中。值按以下顺序添加到 arraylist 对象中。

alNumber.get(1)=0000000042
alName.get(1)=Test Part2
alLevel.get(1)=1
alNumber.get(2)=0000000022
alName.get(2)=Test3243
alLevel.get(2)=1
alNumber.get(3)=0000000061
alName.get(3)=testpartsub
alLevel.get(3)=1
alNumber.get(4)=0000000083
alName.get(4)=testpartsub4
alLevel.get(4)=2

......

以下应该是 XML 文件的输出:

<?xml version="1.0" encoding="UTF-8"?>
<node name="Test Par1" number="0000000041">
   <node name="Test Part2" number="0000000042"/> //Level - 1
   <node name="Test3243" number="0000000022"/>
   <node name="testpartsub" number="0000000061">
        <node name="testpartsub4" number="0000000083"/>  //<Level -2 
        <node name="testpartsub1" number="0000000081">
            <node name="Test1" number="0000000001"/>    //Level -3
            <node name="Testpartsub3" number="0000000082">
                <node name="Test2" number="0000000021"/>   //Level - 4
            </node>
        </node>
    </node>
   <node name="testpartsub2" number="0000000062"/>
   <node name="Test Part4" number="0000000044">
        <node name="testpart4sub1" number="0000000084"/>
   </node>
   <node name="Test Part3" number="0000000043">
        <node name="Test Part5" number="0000000045"/>
        <node name="Test Part6" number="0000000046">
            <node name="Test334344" number="0000000047"/>
            <node name="Test Part4" number="0000000044">
                <node name="testpart4sub1" number="0000000084"/>
            </node>
        </node>
   </node>
   <node name="Testpartsub3" number="0000000082">
      <node name="Test2" number="0000000021"/>
   </node>
</node>

这是我的代码:

DocumentBuilderFactory xmlDocFactory = DocumentBuilderFactory.newInstance();
          DocumentBuilder xmlDocBuilder = xmlDocFactory.newDocumentBuilder();
          System.out.println("**Creating XML File ...");

          xmlDocument = xmlDocBuilder.newDocument();
          rootElement = xmlDocument.createElement("node");
          rootElement.setAttribute("number", wtpart.getNumber());
          rootElement.setAttribute("name", wtpart.getName());
          xmlDocument.appendChild(rootElement);

          Iterator<Integer> iter = alLevel.iterator();

          for (int i=1, j=i+1; i<alNumber.size() && i<alName.size() && i<alLevel.size(); i++,j++) {

              if (alLevel.get(i) == 1) {
                  Element element = xmlDocument.createElement("node");
                  element.setAttribute("number", alNumber.get(i));
                  element.setAttribute("name", alName.get(i));
                  rootElement.appendChild(element);
                  prevElement = element;
              }
              else if (j<=i) {
              if (alLevel.get(j)>alLevel.get(i)){
                  if (alLevel.get(j) != 1) {
                      Element element = xmlDocument.createElement("node");
                      element.setAttribute("number", alNumber.get(i));
                      element.setAttribute("name", alName.get(i));
                      prevElement.appendChild(element);
                      prevElement = element;
                  }}
              else {
                  Element element = xmlDocument.createElement("node");
                  element.setAttribute("number", alNumber.get(i));
                  element.setAttribute("name", alName.get(i));
                  prevElement.appendChild(element);
              }
              }
              else {
                  Element element = xmlDocument.createElement("node");
                  element.setAttribute("number", alNumber.get(i));
                  element.setAttribute("name", alName.get(i));
                  prevElement.appendChild(element);
              }
          }

          TransformerFactory transformerFactory = TransformerFactory.newInstance();
          Transformer transformer = transformerFactory.newTransformer();
          transformer.setOutputProperty(OutputKeys.INDENT, "yes");
          transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
          DOMSource source = new DOMSource(xmlDocument);
          StreamResult result = new StreamResult(new File("E:\\temp", "Test.xml") );
          transformer.transform(source, result);

Answer 1

谢谢奥本兰德。 n 个级别都以这种方式工作。

for (int i = 0; i < alNumber.size(); i++) {
    int currentLevel = alLevel.get(i);
    Element node = xmlDocument.createElement("node");
    node.setAttribute("number", alNumber.get(i));
    node.setAttribute("name", alName.get(i));

    int levelDifference = previousLevel - currentLevel + 1;

    while(levelDifference > 0 ) {
        elementStack.remove(elementStack.size() - 1);
        levelDifference--;
    }

    if(i == 0) {
        xmlDocument.appendChild(node);
    } else {
        Element parentElement = elementStack.get(currentLevel - 1);
        parentElement.appendChild(node);
        elementStack.set(currentLevel - 1,  parentElement);
    }
    elementStack.add(node);
    previousLevel = currentLevel;
    }