在前面的教程中，我们学习了使用DOM解析方式读取和修改XML文件内容，今天我们来学习如何使用DOM解析机制生成XML文件。
下面是我们对要生成的XML文件的具体要求：
1.根节点元素为”Employees”,命名空间为”http://www.iotsi.net/“,根节点下包含一系列的Employee元素。
2.员工的信息通过Employee节点表示，生成的XML文件有两条员工的信息。
3.每个员工有个”id”属性。
4.Employee 元素有四个子元素- “name”, “age”, “role”, “gender”。
下面是程序代码：
package com.journaldev.xml;import java.io.File;import javax.xml.parsers.documentBuilder;import javax.xml.parsers.documentBuilderFactory;import javax.xml.transform.OutputKeys;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.document;import org.w3c.dom.Element;import org.w3c.dom.Node;public class XMLWriterDOM { public static void main(String[] args) { documentBuilderFactory dbFactory = documentBuilderFactory.newInstance(); documentBuilder dBuilder; try { dBuilder = dbFactory.newdocumentBuilder(); document doc = dBuilder.newdocument(); //add elements to document Element rootElement = doc.createElementNS("http://www.journaldev.com/employee", "Employees"); //append root element to document doc.appendChild(rootElement); //append first child element to root element rootElement.appendChild(getEmployee(doc, "1", "Pankaj", "29", "Java Developer", "Male")); //append second child rootElement.appendChild(getEmployee(doc, "2", "Lisa", "35", "Manager", "Female")); //for output to file, console TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); //for pretty print transformer.setOutputProperty(OutputKeys.INDENT, "yes"); DOMSource source = new DOMSource(doc); //write to console or file StreamResult console = new StreamResult(System.out); StreamResult file = new StreamResult(new File("/Users/pankaj/emps.xml")); //write data transformer.transform(source, console); transformer.transform(source, file); System.out.println("DONE"); } catch (Exception e) { e.printStackTrace(); } } private static Node getEmployee(document doc, String id, String name, String age, String role, String gender) { Element employee = doc.createElement("Employee"); //set id attribute employee.setAttribute("id", id); //create name element employee.appendChild(getEmployeeElements(doc, employee, "name", name)); //create age element employee.appendChild(getEmployeeElements(doc, employee, "age", age)); //create role element employee.appendChild(getEmployeeElements(doc, employee, "role", role)); //create gender element employee.appendChild(getEmployeeElements(doc, employee, "gender", gender)); return employee; } //utility method to create text node private static Node getEmployeeElements(document doc, Element element, String name, String value) { Element node = doc.createElement(name); node.appendChild(doc.createTextNode(value)); return node; }}需要注意的是代码中创建了两个StreamResult对象，一个是出于调试的目的將XML文件内容输出到控制台中，另一个將XML内容写到文件中。
程序输出的XML内容：
Pankaj 29 Java Developer Male Lisa 35 Manager Female
该XML内容没有格式化，如果你需要对XML内容做适当的格式化，参考这篇文章Java中格式化XML
在前面的教程中，我们学习了使用DOM解析方式读取和修改XML文件内容，今天我们来学习如何使用DOM解析机制生成XML文件。
下面是我们对要生成的XML文件的具体要求：
1.根节点元素为”Employees”,命名空间为”http://www.iotsi.net/“,根节点下包含一系列的Employee元素。
2.员工的信息通过Employee节点表示，生成的XML文件有两条员工的信息。
3.每个员工有个”id”属性。
4.Employee 元素有四个子元素- “name”, “age”, “role”, “gender”。
下面是程序代码：
package com.journaldev.xml;import java.io.File;import javax.xml.parsers.documentBuilder;import javax.xml.parsers.documentBuilderFactory;import javax.xml.transform.OutputKeys;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.document;import org.w3c.dom.Element;import org.w3c.dom.Node;public class XMLWriterDOM { public static void main(String[] args) { documentBuilderFactory dbFactory = documentBuilderFactory.newInstance(); documentBuilder dBuilder; try { dBuilder = dbFactory.newdocumentBuilder(); document doc = dBuilder.newdocument(); //add elements to document Element rootElement = doc.createElementNS("http://www.journaldev.com/employee", "Employees"); //append root element to document doc.appendChild(rootElement); //append first child element to root element rootElement.appendChild(getEmployee(doc, "1", "Pankaj", "29", "Java Developer", "Male")); //append second child rootElement.appendChild(getEmployee(doc, "2", "Lisa", "35", "Manager", "Female")); //for output to file, console TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); //for pretty print transformer.setOutputProperty(OutputKeys.INDENT, "yes"); DOMSource source = new DOMSource(doc); //write to console or file StreamResult console = new StreamResult(System.out); StreamResult file = new StreamResult(new File("/Users/pankaj/emps.xml")); //write data transformer.transform(source, console); transformer.transform(source, file); System.out.println("DONE"); } catch (Exception e) { e.printStackTrace(); } } private static Node getEmployee(document doc, String id, String name, String age, String role, String gender) { Element employee = doc.createElement("Employee"); //set id attribute employee.setAttribute("id", id); //create name element employee.appendChild(getEmployeeElements(doc, employee, "name", name)); //create age element employee.appendChild(getEmployeeElements(doc, employee, "age", age)); //create role element employee.appendChild(getEmployeeElements(doc, employee, "role", role)); //create gender element employee.appendChild(getEmployeeElements(doc, employee, "gender", gender)); return employee; } //utility method to create text node private static Node getEmployeeElements(document doc, Element element, String name, String value) { Element node = doc.createElement(name); node.appendChild(doc.createTextNode(value)); return node; }}需要注意的是代码中创建了两个StreamResult对象，一个是出于调试的目的將XML文件内容输出到控制台中，另一个將XML内容写到文件中。
程序输出的XML内容：
Pankaj 29 Java Developer Male Lisa 35 Manager Female
以上就是Java&Xml教程（四）使用DOM方式生成XML文件的内容，更多相关内容请关注PHP中文网（www.iotsi.net）！
