W3C Document对象解析XML

 1 public String viewPic(HttpServletRequest request, String id) {
 2         //创建Document对象及读取XML文件
 3 DocumentBuilderFactory builderFactory = DocumentBuilderFactory
 4         .newInstance();
 5         //解析XML
 6         Document document=null;
 7         try {
 8             DocumentBuilder builder = builderFactory.newDocumentBuilder();
 9             
10             document = builder.parse(new File(request.getSession()
11                 .getServletContext().getRealPath(
12                     "/WEB-INF/classes/MyXml.xml")));
13         } catch (ParserConfigurationException e) {
14             e.printStackTrace();
15         } catch (SAXException e) {
16             e.printStackTrace();
17         } catch (IOException e) {
18             e.printStackTrace();
19         }
20         Element rootElement = document.getDocumentElement(); //获取根节点
21         NodeList childNodes = rootElement.getChildNodes();  //根节点下所有子节点
22 
23         for (int i = 0; i < childNodes.getLength(); i++) {  //循环第一层子节点
24                  Node childNode = childNodes.item(i);  
25                  NodeList childNodes_2 = childNode.getChildNodes();  
26                      for(int j = 0;j < childNodes_2.getLength();j++){   //循环第二层子节点
27                       Node childNode_2 = childNodes_2.item(j);  
28                       NodeList childNodes_3 = childNode_2.getChildNodes();  
29                           for(int k = 0;k < childNodes_3.getLength();k++){    //第三层
30                                 Node childNode_3 = childNodes_3.item(k);                    
31                             System.out.println(childNode_3.getNodeValue());
32                           }
33                      }
34             }
35 
36         return "img_1.jsp";
37 }