DOM解析器演示使用DocumentBuilder。

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Code is to demonstrate the use of DocumentBuilder to parse the XML file. And retrieve the data from it.
  1. import java.io.File;
  2. import java.io.IOException;
  3.  
  4. import javax.xml.parsers.DocumentBuilder;
  5. import javax.xml.parsers.DocumentBuilderFactory;
  6. import javax.xml.parsers.ParserConfigurationException;
  7.  
  8. import org.w3c.dom.Document;
  9. import org.w3c.dom.Element;
  10. import org.w3c.dom.Node;
  11. import org.w3c.dom.NodeList;
  12. import org.xml.sax.SAXException;
  13.  
  14.  
  15. public class DocumentBuilderDemo {
  16.  
  17.  
  18. 	public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
  19. 		DocumentBuilder db = null;
  20. 		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  21. 		db = dbf.newDocumentBuilder();
  22. 		Document doc = db.parse(new File("c:\simple.xml"));
  23.  
  24. 		Element root = doc.getDocumentElement();
  25. 		System.out.println(root.getNodeName());
  26.  
  27. 		System.out.println("========================================================================");
  28.  
  29. 		NodeList nodeList = root.getElementsByTagName("to");
  30.  
  31. 		for (int i = 0; i < nodeList.getLength(); i++) {
  32. 			Node node = nodeList.item(i).getFirstChild();
  33. 			System.out.println(node.getNodeValue());
  34. 		}
  35.  
  36. 		System.out.println("========================================================================");
  37.  
  38. 		nodeList = root.getElementsByTagName("from");
  39.  
  40. 		for (int i = 0; i < nodeList.getLength(); i++) {
  41. 			Node node = nodeList.item(i).getFirstChild();
  42. 			System.out.println(node.getNodeValue());
  43. 		}
  44.  
  45. 		System.out.println("========================================================================");
  46.  
  47. 		nodeList = root.getElementsByTagName("body");
  48.  
  49. 		for (int i = 0; i < nodeList.getLength(); i++) {
  50. 			Node node = nodeList.item(i).getFirstChild();
  51. 			System.out.println(node.getNodeValue());
  52. 		}
  53.  
  54. 		System.out.println("========================================================================");
  55.  
  56.  
  57. 	}
  58.  
  59. }
  60.  
  61.  
  62. /*
  63. The simple.xml file that we used for parsing in above example.
  64.  
  65.  
  66. <?xml version="1.0"?>
  67. <msg>
  68. 	<note>
  69. 		<to>Tom</to>
  70. 		<from>Prince</from>
  71. 		<heading>Reminder</heading>
  72. 		<body>Hello how are u?</body>
  73. 	</note>
  74. 	<note>
  75. 		<to>Sania</to>
  76. 		<from>Prince</from>
  77. 		<heading>Joking</heading>
  78. 		<body>Welcome!!!</body>
  79. 	</note>
  80. </msg>
  81.  
  82. */

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