使用 java 将节点附加到现有的 XML 文件中
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时间：2020-08-13 07:34:28 来源:igfitidea点击:
Append nodes into existing XML File with java
提问by user3216026
Hi im looking for a solution to append nodes from java into an existing xml file. What i got is an xml file like this
嗨，我正在寻找将节点从 java 附加到现有 xml 文件的解决方案。我得到的是一个像这样的 xml 文件
<data>
<people>
<person>
<firstName>Frank</firstName>
<lastName>Erb</lastName>
<access>true</access>
<images>
<img>hm001.jpg</img>
</images>
</person>
<person>
<firstName>Hans</firstName>
<lastName>Mustermann</lastName>
<access>true</access>
<images>
<img>hm001.jpg</img>
</images>
</person>
<person>
<firstName>Thomas</firstName>
<lastName>Tester</lastName>
<access>false</access>
<images>
<img>tt001.jpg</img>
</images>
</person>
</people>
</data>
what i whant to add is a person node with its elements inside the people element. My big problem is the data node which is root node. If it would be the Person node as root I could solve it. But I can't manage to get the person nodes under the people node.
我要添加的是一个 person 节点，其元素位于 people 元素内。我的大问题是作为根节点的数据节点。如果它是作为 root 的 Person 节点，我可以解决它。但是我无法在人员节点下获得人员节点。
<person>
<firstName>Tom</firstName>
<lastName>Hanks</lastName>
<access>false</access>
<images>
<img>tt001.jpg</img>
</images>
</person>
thanks for your help!
感谢您的帮助！
my java code looks as far like this
我的java代码看起来像这样
Element root = document.getDocumentElement();
// Root Element
Element rootElement = document.getDocumentElement();
Collection<Server> svr = new ArrayList<Server>();
svr.add(new Server());
for (Server i : svr) {
// server elements
Element server = document.createElement("people");
rootElement.appendChild(server);
//rootElement.appendChild(server);
Element name = document.createElement("person");
server.appendChild(name);
Element firstName = document.createElement("firstName");
firstName.appendChild(document.createTextNode(i.getFirstName()));
server.appendChild(firstName);
name.appendChild(firstName);
Element port = document.createElement("lastName");
port.appendChild(document.createTextNode(i.getLastName()));
server.appendChild(port);
name.appendChild(port);
Element access = document.createElement("access");
access.appendChild(document.createTextNode(i.getAccess()));
server.appendChild(access);
name.appendChild(access);
String imageName = Main.randomImgNr+"";
Element images = document.createElement("images");
//images.appendChild(document.createTextNode(i.getAccess()));
Element img = document.createElement("img");
img.appendChild(document.createTextNode(imageName));//i.getImage()));
images.appendChild(img);
server.appendChild(images);
name.appendChild(images);
root.appendChild(server);
采纳答案by Felipe T.
Without a library you can do something like this:
没有图书馆，你可以做这样的事情：
Element dataTag = doc.getDocumentElement();
Element peopleTag = (Element) dataTag.getElementsByTagName("people").item(0);
Element newPerson = doc.createElement("person");
Element firstName = doc.createElement("firstName");
firstName.setTextContent("Tom");
Element lastName = doc.createElement("lastName");
lastName.setTextContent("Hanks");
newPerson.appendChild(firstName);
newPerson.appendChild(lastName);
peopleTag.appendChild(newPerson);
Which results:
结果：
...
<person>
<firstName>Thomas</firstName>
<lastName>Tester</lastName>
<access>false</access>
<images>
<img>tt001.jpg</img>
</images>
</person>
<person>
<firstName>Tom</firstName>
<lastName>Hanks</lastName>
</person>
</people>
</data>
回答by MariuszS
This is very easy with JOOXlibrary, examples:
使用JOOX库，这很容易，示例：
// Parse the document from a file
Document document = $(xmlFile).document();
// Find the order at index 4 and add an element "paid"
$(document).find("people").children().eq(4).append("<paid>true</paid>");
// Find those orders that are paid and flag them as "settled"
$(document).find("people").children().find("paid").after("<settled>true</settled>");
回答by Wayne
Follow this general approach:
请遵循以下通用方法：
public static void main(String[] args) {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = null;
try {
db = dbf.newDocumentBuilder();
Document doc = db.parse("input.xml");
NodeList people = doc.getElementsByTagName("people");
people.item(0)
.appendChild(
createPersonElement(doc, "Tom", "Hanks", true,
"tt001.jpg"));
System.out.println(nodeToString(doc));
} catch (SAXException e) {
// handle SAXException
} catch (IOException e) {
// handle IOException
} catch (TransformerException e) {
// handle TransformerException
} catch (ParserConfigurationException e1) {
// handle ParserConfigurationException
}
}
private static Element createPersonElement(Document doc, String firstName,
String lastName, Boolean access, String image) {
Element el = doc.createElement("person");
el.appendChild(createPersonDetailElement(doc, "firstName", firstName));
el.appendChild(createPersonDetailElement(doc, "lastName", lastName));
el.appendChild(createPersonDetailElement(doc, "access",
access.toString()));
Element images = doc.createElement("images");
images.appendChild(createPersonDetailElement(doc, "img", image));
el.appendChild(images);
return el;
}
private static Element createPersonDetailElement(Document doc, String name,
String value) {
Element el = doc.createElement(name);
el.appendChild(doc.createTextNode(value));
return el;
}
This uses the following helper method to print the results:
这使用以下辅助方法来打印结果：
private static String nodeToString(Node node) throws TransformerException {
StringWriter buf = new StringWriter();
Transformer xform = TransformerFactory.newInstance().newTransformer();
xform.transform(new DOMSource(node), new StreamResult(buf));
return buf.toString();
}
This could be modified to update the original file instead.
这可以修改为更新原始文件。
回答by Nandkishor Mewara
public static void main(String[] args) throws ParserConfigurationException, IOException {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db;
db = null;
try {
db = dbf.newDocumentBuilder();
Document doc = db.parse("input.xml");
NodeList people = doc.getElementsByTagName("people");
people.item(0).appendChild(createPersonElement(doc, "Tom", "Hanks", true, "tt001.jpg"));
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
DOMSource source = new DOMSource(doc);
StreamResult console = new StreamResult(System.out);//for Console print
transformer.transform(source, console);
StreamResult file = new StreamResult(new File("input.xml"));
transformer.transform(source, file);
} catch (SAXException | IOException | TransformerException | ParserConfigurationException e) {
System.out.println(e);
}
}
private static Element createPersonElement(Document doc, String firstName,
String lastName, Boolean access, String image) {
Element el = doc.createElement("person");
el.appendChild(createPersonDetailElement(doc, "firstName", firstName));
el.appendChild(createPersonDetailElement(doc, "lastName", lastName));
el.appendChild(createPersonDetailElement(doc, "access",
access.toString()));
Element images = doc.createElement("images");
images.appendChild(createPersonDetailElement(doc, "img", image));
el.appendChild(images);
return el;
}
private static Element createPersonDetailElement(Document doc, String name,
String value) {
Element el = doc.createElement(name);
el.appendChild(doc.createTextNode(value));
return el;
}
