java - 如何使用java制作动态xml

Question

我有一个固定的 XML 模板，节点可能会根据数据增加。如果我有一个固定的模板。当提供父节点名称时，如何迭代所有子节点？我可以根据 xpath 制作 XML 吗？

我有以下代码:-

Map map = hm(); 
            Set set = map.entrySet(); 
            // Get an iterator 
            Iterator it = set.iterator(); 
            // Display elements 
            while(it.hasNext()) { 
                Map.Entry me = (Map.Entry)it.next(); 
                if (check) {
                    xpath_String+= "|"+me.getKey(); 
                }else {
                    xpath_String+= me.getKey();
                    check = true;
                }           
            }

        DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
            domFactory.setNamespaceAware(true); 
        DocumentBuilder builder = domFactory.newDocumentBuilder();
        //xml file name acts as template
        Document doc = builder.parse("template.xml"); 


        XPathFactory factory = XPathFactory.newInstance();
        XPath xpath = factory.newXPath(); 
        XPathExpression expr = xpath.compile(xpath_String);  
        Object result = expr.evaluate(doc, XPathConstants.NODESET); 
        NodeList nodes = (NodeList) result; 
        System.out.println("Total number of tokens: "+nodes.getLength());
        //for (int i = 0; i < nodes.getLength(); i++) {

        int i=0;

        StringTokenizer st = new StringTokenizer(xpath_String,"|");

        while (st.hasMoreElements()) {
            String val = (String) st.nextElement();
            if(hm().containsKey(val)){
                System.out.println("Node value is: "+nodes.item(i).getNodeName());
                nodes.item(i).setTextContent(hm().get(val).toString());
                i++;
            }
        }
        //}

        //write the content into xml file
         TransformerFactory transformerFactory = TransformerFactory.newInstance();
         Transformer transformer = transformerFactory.newTransformer();
         DOMSource source = new DOMSource(doc);
         // generating the output file name
         StreamResult finalResult =  new StreamResult(new File("newfxml.xml"));
         transformer.transform(source, finalResult);

         //making a string for the dom
         StringWriter writer = new StringWriter();
         StreamResult stResult = new StreamResult(writer);
         transformer.transform(source, stResult);

这里我有一个固定的模板和一张 map 。从 map 中我得到了 xpath 及其相应的值。只有在模板 xml 中的节点不再重复之前，这种情况才有效。所以我想知道当我获得可重复组件时是否有任何方法可以迭代整个 xml 节点 block 。有这样的解决办法吗？或者我需要改变我打算继续的方式？

Answer 1

如果你想枚举一个节点的所有子节点，你只需要使用类似 'Elementparent = root.getChild("parentNodeName")' 的方式获取你的父节点，然后你就可以用相同的方法枚举子节点'列出 child =parent.getChildren(“childName”)'。

    Document doc = null;
    SAXBuilder sxb = new SAXBuilder();
    try {
        doc = sxb.build(new File(MyXmlFilePath));
    } catch (JDOMException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    Element root = doc.getRootElement();
    List<Element> nodes = root.getChildren("myNode");
    Iterator<Element> it = nodes.iterator();
    while(it.hasNext())
    {
        Element currentNode = it.next();
        // node treatment here
    }

安胡因。