Java DOM - 一个接一个地插入一个元素

Question

给出以下XML文件:

<?xml version="1.0" encoding="UTF-8"?>
<process
    name="TestSVG2"
    xmlns="http://www.example.org"
    targetNamespace="http://www.example.org"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <sequence>
      <receive name="Receive1" createInstance="yes"/>
      <assign name="Assign1"/>
      <invoke name="Invoke1"/>
      <assign name="Assign2"/>
      <reply name="Reply1"/>
   </sequence>
</process>

我想<sequence></sequence> 在一个预先存在的元素之后添加一个新元素.例如,如果我想在之后添加节点"Assign1",则新XML应该是这样的:

   <sequence>
      <receive name="Receive1" createInstance="yes"/>
      <assign name="Assign1"/>
      <newtype name="NewNode"/>
      <invoke name="Invoke1"/>
      <assign name="Assign2"/>
      <reply name="Reply1"/>
   </sequence>

我必须在一个函数中使用Java DOM来做到这一点.函数签名应该是这样的:

 public void addActionDom(String name, String stepType, String stepName)

哪里:

• name 是预先存在的元素,之后将插入;
• stepType 是插入的元素类型;
• stepName 是新插入元素的name属性.

目前,我缺乏JDOM或任何其他Java XML库的经验.您能否提供一个示例代码,或者指向一个教程,其中在某个元素之后插入.

这是我到目前为止的代码:

    public void addActionDom(String name, String stepType, String stepName) {
        File xmlFile = new File(path + "/resources/" + BPELFilename);
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db;
        try {
            /* Load XML */
            db = dbf.newDocumentBuilder();
            Document doc = db.parse(xmlFile);
            doc.getDocumentElement().normalize();

            /* Iterate throughout the type tags and delete */
            for (String cTag : typeTags) {
                NodeList cnl = doc.getElementsByTagName(cTag);
                for (int i = 0; i < cnl.getLength(); ++i) {
                    Node cnode = cnl.item(i);
                    if (cnode.getNodeType() == Node.ELEMENT_NODE) {
                        Element elem = (Element)cnode; // 'elem' Element after which the insertion should be made
                        if (elem.getAttribute("name").equals(name)) { 
                            Element newElement = doc.createElement(stepType); // Element to be inserted 
                            newElement.setAttribute("name", stepName);
                            // CODE HERE
                        }
                    }
                }
            }

            /* Save the editing */
            Transformer transformer =
                TransformerFactory.newInstance().newTransformer();
            StreamResult result =
                new StreamResult(new FileOutputStream(path + "/resources/" +
                                                      BPELFilename));
            DOMSource source = new DOMSource(doc);
            transformer.transform(source, result);
        } catch (Exception e) {
            /* ParserConfigurationException */
            /* SAXException */
            /* IOException */
            /* TransformerConfigurationException */
            /* TransformerException */
            /* Exception */
            e.printStackTrace();
        }
    }
}

Answer 1

好的,Aaron Digulla在速度方面打败了我.不得不自己搞清楚.我没用cnl.item(i+1)但是nextSibling():

Element newElement = doc.createElement(stepType); // Element to be inserted 
newElement.setAttribute("name", stepName);
elem.getParentNode().insertBefore(newElement, elem.getNextSibling());

您无法在指定的索引处插入节点.唯一的节点插入方法是

appendChild(Node node) //appends the given child to the end of the list of children

和

insertBefore(Node new, Node child) //inserts "new" into the list, before the 'child' node.

如果有一个insertAfter(Node new,Node child)方法,这对你来说非常容易.但不幸的是,没有.