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Java 解析/读取XML 文件
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[代码] students.xml
01 <?xml version="1.0"?>
02 <students>
03 <student>
04 <name>John</name>
05 <grade>B</grade>
06 <age>12</age>
07 </student>
08 <student>
09 <name>Mary</name>
10 <grade>A</grade>
11 <age>11</age>
12 </student>
13 <student>
14 <name>Simon</name>
15 <grade>A</grade>
16 <age>18</age>
17 </student>
18 </students>
[代码] XMLParser.java
01 package net.viralpatel.java.xmlparser;
02
03 import java.io.File;
04 import javax.xml.parsers.DocumentBuilder;
05 import javax.xml.parsers.DocumentBuilderFactory;
06
07 import org.w3c.dom.Document;
08 import org.w3c.dom.Element;
09 import org.w3c.dom.Node;
10 import org.w3c.dom.NodeList;
11
12 public class XMLParser {
13
14 public void getAllUserNames(String fileName) {
15 try {
16 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
17 DocumentBuilder db = dbf.newDocumentBuilder();
18 File file = new File(fileName);
19 if (file.exists()) {
20 Document doc = db.parse(file);
21 Element docEle = doc.getDocumentElement();
22
23 // Print root element of the document
24 System.out.println("Root element of the document: "
25 + docEle.getNodeName());
26
27 NodeList studentList = docEle.getElementsByTagName("student");
28
29 // Print total student elements in document
30 System.out.println("Total students: " + studentList.getLength());
31
32 if (studentList != null && studentList.getLength() > 0) {
33 for (int i = 0; i < studentList.getLength(); i++) {
34
35 Node node = studentList.item(i);
36
37 if (node.getNodeType() == Node.ELEMENT_NODE) {
38
39 System.out.println("=====================");
40
41 Element e = (Element) node;
42 NodeList nodeList = e.getElementsByTagName("name");
43 System.out.println("Name: "
44 + nodeList.item(0).getChildNodes().item(0)
45 .getNodeValue());
46
47 nodeList = e.getElementsByTagName("grade");
48 System.out.println("Grade: "
49 + nodeList.item(0).getChildNodes().item(0)
50 .getNodeValue());
51
52 nodeList = e.getElementsByTagName("age");
53 System.out.println("Age: "
54 + nodeList.item(0).getChildNodes().item(0)
55 .getNodeValue());
56 }
57 }
58 } else {
59 System.exit(1);
60 }
61 }
62 } catch (Exception e) {
63 System.out.println(e);
64 }
65 }
66 public static void main(String[] args) {
67
68 XMLParser parser = new XMLParser();
69 parser.getAllUserNames("c:\students.xml");
70 }
71 }
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