[ Java 代碼範本 ] How To Create XML File In Java – (DOM Parser)

來源自 這裡 
Preface: 
DOM provides many handy classes to create XML file easily. Firstly, you have to create a Document with DocumentBuilder class, define all the XML content – node, attribute with Element class. In last, use Transformer class to output the entire XML content to stream output, typically a File. 

In this tutorial, we show you how to use DOM XML parser to create a XML file. 

DOM Parser Example: 
At the end of the example, following XML file named “file.xml” will be created: 
 

範例代碼如下: 
- WriteXMLFile.java – Java class to create a XML file. 

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1. package com.mkyong.core;  
2.   
3. import java.io.File;  
4. import javax.xml.parsers.DocumentBuilder;  
5. import javax.xml.parsers.DocumentBuilderFactory;  
6. import javax.xml.parsers.ParserConfigurationException;  
7. import javax.xml.transform.Transformer;  
8. import javax.xml.transform.TransformerException;  
9. import javax.xml.transform.TransformerFactory;  
10. import javax.xml.transform.dom.DOMSource;  
11. import javax.xml.transform.stream.StreamResult;  
12.   
13. import org.w3c.dom.Attr;  
14. import org.w3c.dom.Document;  
15. import org.w3c.dom.Element;  
16.   
17. public class WriteXMLFile {  
18.   
19.     public static void main(String argv[]) {  
20.   
21.       try {  
22.   
23.         DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();  
24.         DocumentBuilder docBuilder = docFactory.newDocumentBuilder();  
25.   
26.         // root elements  
27.         Document doc = docBuilder.newDocument();  
28.         Element rootElement = doc.createElement("company");  
29.         doc.appendChild(rootElement);  
30.   
31.         // staff elements  
32.         Element staff = doc.createElement("Staff");  
33.         rootElement.appendChild(staff);  
34.   
35.         // set attribute to staff element  
36.         Attr attr = doc.createAttribute("id");  
37.         attr.setValue("1");  
38.         staff.setAttributeNode(attr);  
39.   
40.         // shorten way  
41.         // staff.setAttribute("id", "1");  
42.   
43.         // firstname elements  
44.         Element firstname = doc.createElement("firstname");  
45.         firstname.appendChild(doc.createTextNode("yong"));  
46.         staff.appendChild(firstname);  
47.   
48.         // lastname elements  
49.         Element lastname = doc.createElement("lastname");  
50.         lastname.appendChild(doc.createTextNode("mook kim"));  
51.         staff.appendChild(lastname);  
52.   
53.         // nickname elements  
54.         Element nickname = doc.createElement("nickname");  
55.         nickname.appendChild(doc.createTextNode("mkyong"));  
56.         staff.appendChild(nickname);  
57.   
58.         // salary elements  
59.         Element salary = doc.createElement("salary");  
60.         salary.appendChild(doc.createTextNode("100000"));  
61.         staff.appendChild(salary);  
62.   
63.         // write the content into xml file  
64.         TransformerFactory transformerFactory = TransformerFactory.newInstance();  
65.         Transformer transformer = transformerFactory.newTransformer();  
66.         DOMSource source = new DOMSource(doc);  
67.         StreamResult result = new StreamResult(new File("C:\\file.xml"));  
68.   
69.         // Output to console for testing  
70.         // StreamResult result = new StreamResult(System.out);  
71.   
72.         transformer.transform(source, result);  
73.   
74.         System.out.println("File saved!");  
75.   
76.       } catch (ParserConfigurationException pce) {  
77.         pce.printStackTrace();  
78.       } catch (TransformerException tfe) {  
79.         tfe.printStackTrace();  
80.       }  
81.     }  
82. }  

A new XML file is created in “C:\\file.xml“, with default UTF-8 encoded. For debugging, you can change the StreamResult to output the XML content to your console. 

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1. StreamResult result =  new StreamResult(System.out);  
2. transformer.transform(source, result);  

Supplement: 
* Java中四種操作（DOM、SAX、JDOM、DOM4J）xml方式的比較與詳解