Java调用XML的方法：DocumentBuilderFactory

首先得到：得到 DOM 解析器的工厂实例     DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance();

然后从 DOM 工厂获得 DOM 解析器

DocumentBuilder dombuilder=domfac.newDocumentBuilder();

3 ）把要解析的 XML 文档转化为输入流，以便 DOM 解析器解析它

InputStream is= new FileInputStream("test1.xml");        

（ 4 ）解析 XML 文档的输入流，得到一个 Document

Document doc=dombuilder.parse(is);

（ 5 ）得到 XML 文档的根节点

Element root=doc.getDocumentElement();

（ 6 ）得到节点的子节点

  NodeList books=root.getChildNodes();

 

 

下面是一个简单的例子  可以实战一下

1. import java.io.File;  
2. import java.io.FileInputStream;  
3. import java.io.InputStream;  
4.  
5. import javax.xml.parsers.DocumentBuilder;  
6. import javax.xml.parsers.DocumentBuilderFactory;  
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.  
13. public class XmlReader {  
14.     public static void main(String[] args) {  
15.         XmlReader reader = new XmlReader();  
16.     }  
17.     public XmlReader(){  
18.         DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();  
19.         try {  
20.             DocumentBuilder domBuilder = domfac.newDocumentBuilder();  
21.             InputStream is = new FileInputStream(new File("D:/test1.xml"));  
22.             Document doc = domBuilder.parse(is);  
23.             Element root = doc.getDocumentElement();  
24.             NodeList books = root.getChildNodes();  
25.             if(books!=null){  
26.                 for (int i = 0; i < books.getLength(); i++) {  
27.                     Node book = books.item(i);  
28.                      if(book.getNodeType()==Node.ELEMENT_NODE) {  
29.                             //（7）取得节点的属性值  
30.                             String email=book.getAttributes().getNamedItem("email").getNodeValue();  
31.                             System.out.println(email);  
32.                             //注意，节点的属性也是它的子节点。它的节点类型也是Node.ELEMENT_NODE  
33.                             //（8）轮循子节点  
34.                             for(Node node=book.getFirstChild();node!=null;node=node.getNextSibling()) {  
35.                                 if(node.getNodeType()==Node.ELEMENT_NODE) {  
36.                                     if(node.getNodeName().equals("name")) {  
37.                                         String name=node.getNodeValue();  
38.                                         String name1=node.getFirstChild().getNodeValue();  
39.                                         System.out.println(name);  
40.                                         System.out.println(name1);  
41.                                     }  
42.                                     if(node.getNodeName().equals("price")) {  
43.                                         String price=node.getFirstChild().getNodeValue();  
44.                                         System.out.println(price);  
45.                                     }  
46.                                 }  
47.                             }  
48.                      }  
49.                 }  
50.             }  
51.         } catch (Exception e) {  
52.             // TODO Auto-generated catch block  
53.             e.printStackTrace();  
54.         }  
55.           
56.     }  
57. } 

 

 

输入一个XML文档就可以测试了啊