Java DOM解析器 - 查询XML文档

演示示例

这是需要我们查询的输入XML文件：

<?xml version="1.0"?>
<cars>
   <supercars company="Ferrari">
      <carname type="formula one">Ferarri 101</carname>
      <carname type="sports car">Ferarri 201</carname>
      <carname type="sports car">Ferarri 301</carname>
   </supercars>
   <supercars company="Lamborgini">
      <carname>Lamborgini 001</carname>
      <carname>Lamborgini 002</carname>
      <carname>Lamborgini 003</carname>
   </supercars>
   <luxurycars company="Benteley">
      <carname>Benteley 1</carname>
      <carname>Benteley 2</carname>
      <carname>Benteley 3</carname>
   </luxurycars>
</cars>

%uA0

演示示例：

QueryXmlFileDemo.java

package com.yiibai.xml

import javax.xml.parsers.DocumentBuilderFactory
import javax.xml.parsers.DocumentBuilder
import org.w3c.dom.Document
import org.w3c.dom.NodeList
import org.w3c.dom.Node
import org.w3c.dom.Element
import java.io.File

public class QueryXmlFileDemo {
	
   public static void main(String argv[]) {
 
      try {
         File inputFile = new File("input.txt")
         DocumentBuilderFactory dbFactory = 
            DocumentBuilderFactory.newInstance()
         DocumentBuilder dBuilder = dbFactory.newDocumentBuilder()
         Document doc = dBuilder.parse(inputFile)
         doc.getDocumentElement().normalize()
         System.out.print("Root element: ")
         System.out.println(doc.getDocumentElement().getNodeName())
         NodeList nList = doc.getElementsByTagName("supercars")
         System.out.println("----------------------------")
         for (int temp = 0 temp < nList.getLength() temp++) {
            Node nNode = nList.item(temp)
            System.out.println("\nCurrent Element :")
            System.out.print(nNode.getNodeName())
            if (nNode.getNodeType() == Node.ELEMENT_NODE) {
               Element eElement = (Element) nNode
               System.out.print("company : ")
               System.out.println(eElement.getAttribute("company"))
               NodeList carNameList = 
                  eElement.getElementsByTagName("carname")
               for (int count = 0 
                  count < carNameList.getLength() count++) {	 
                  Node node1 = carNameList.item(count)
                  if (node1.getNodeType() ==
                     node1.ELEMENT_NODE) {
                     Element car = (Element) node1
                     System.out.print("car name : ")
                     System.out.println(car.getTextContent())
                     System.out.print("car type : ")
                     System.out.println(car.getAttribute("type"))
                  }
               }
            }
         }
      } catch (Exception e) {
         e.printStackTrace()
      }
   }
}

这将产生以下结果：

Root element :cars
----------------------------

Current Element :supercars
company : Ferrari
car name : Ferarri 101
car type : formula one
car name : Ferarri 201
car type : sports car
car name : Ferarri 301
car type : sports car

Current Element :supercars
company : Lamborgini
car name : Lamborgini 001
car type : 
car name : Lamborgini 002
car type : 
car name : Lamborgini 003
car type :

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