JAVA根据XML节点读取XML文件内容

XML文件 book.xml
<book>
<person>
<first>Kiran</first>
<last>Pai</last>
<age>22</age>
</person>
<person>
<first>Bill</first>
<last>Gates</last>
<age>46</age>
</person>
<person>
<first>Steve</first>
<last>Jobs</last>
<age>40</age>
</person>
</book>
程序输出
Root element of the doc is book
Total no of people: 3
First Name: Kiran
Last Name: Pai
Age: 22
First Name: Bill
Last Name: Gates
Age: 46
First Name: Steve
Last Name: Jobs
Age: 40
程序清单
import java.io.File;
import org.w3c.dom.Document;
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
public class ReadAndPrintXMLFile{
    public static void main (String argv []){
    try {
            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            Document doc = docBuilder.parse (new File("book.xml"));
            // normalize text representation           
            doc.getDocumentElement ().normalize ();
            System.out.println ("Root element of the doc is " + doc.getDocumentElement().getNodeName());
            NodeList listOfPersons = doc.getElementsByTagName("person");