话不多说，代码如下：
public class BuildXmlUtil {
public static void main(String[] args) throws Exception {
buildxml();
}
public static void buildxml() throws ParserConfigurationException, TransformerException{
//step1:获得一个DocumentBuilderFactory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
//step2:获得一个DocumentBuilder
DocumentBuilder db = factory.newDocumentBuilder();
//step3:新建一个Document对象
Document document = db.newDocument();
//step4:创建一个根节点
Element rootElement = document.createElement("engineering");
for (int i=0;i<3;i++){
//step5:创建一个节点
Element person = document.createElement("engineering");
//step6:为该节点设定属性
person.setAttribute("id", "id_");
Element name = document.createElement("name");
//为节点设定文本内容
name.setTextContent("name_");
Element author = document.createElement("author");
author.setTextContent("author_");
Element addressUrl = document.createElement("addressUrl");
addressUrl.setTextContent("addressUrl_");
person.appendChild(name);
person.appendChild(author);
person.appendChild(addressUrl);
//step7:为某一元素节点设立子节点
rootElement.appendChild(person);
}
//step8:把刚刚建立的根节点添加到document对象中
document.appendChild(rootElement);
//step9:获得一个TransformerFactory对象
TransformerFactory transformerFactory = TransformerFactory.newInstance();
//step10:获得一个Transformer对象
Transformer transformer = transformerFactory.newTransformer();
//step11:把document对象用一个DOMSource对象包装起来
Source xmlSource = new DOMSource(document);
System.out.println(xmlSource);
//step12:建立一个存储目标对象
Result outputTarget = new StreamResult(new File("C:\Users\yc\Desktop\persons.xml"));
//step13:生成相应的xml文件
transformer.transform(xmlSource,outputTarget);
}
}