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第一种xml:(注意book.xml中id的位置)
book.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
<book id="1">
<name>懂得生活</name>
<author>Mr Azzan</author>
<year>2017</year>
<price>100.00</price>
</book>
<book id="2">
<name>热爱生活</name>
<author>Miss Sun</author>
<year>2017</year>
<price>121.00</price>
</book>
</bookstore>
DomTest.java文件
package DomReadXMLFile;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class DomTest {
public static void main(String[] args) {
//创建DocumentBuilderFactory对象
DocumentBuilderFactory a = DocumentBuilderFactory.newInstance();
try {
//创建DocumentBuilder对象
DocumentBuilder b = a.newDocumentBuilder();
//通过DocumentBuilder对象的parse方法返回一个Document对象
Document document = b.parse("book.xml");
//通过Document对象的getElementsByTagName()返根节点的一个list集合
NodeList booklist = document.getElementsByTagName("book");
for(int i =0; i<booklist.getLength(); i++){
//循环遍历获取每一个book
Node book = booklist.item(i);
//通过Node对象的getAttributes()方法获取全的属性值
NamedNodeMap bookmap = book.getAttributes();
//循环遍每一个book的属性值
for(int j = 0; j<bookmap.getLength(); j++){
Node node = bookmap.item(j);
//通过Node对象的getNodeName()和getNodeValue()方法获取属性名和属性值
System.out.print(node.getNodeName()+":");
System.out.println(node.getNodeValue());
}
//解析book节点的子节点
NodeList childlist = book.getChildNodes();
for(int t = 0; t<childlist.getLength(); t++){
//区分出text类型的node以及element类型的node
if(childlist.item(t).getNodeType() == Node.ELEMENT_NODE){
System.out.print(childlist.item(t).getNodeName()+":");
System.out.println(childlist.item(t).getTextContent());
}
}
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
运行结果:
第二种xml:(注意booktwo.xml中id的位置)
booktwo.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
<book>
<id>1</id>
<name>懂得生活</name>
<author>Mr Azzan</author>
<year>2017</year>
<price>100.00</price>
</book>
<book>
<id>2</id>
<name>热爱生活</name>
<author>Miss Sun</author>
<year>2017</year>
<price>121.00</price>
</book>
</bookstore>
DomTestTwo.java文件
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package DomReadXMLFile;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class DomTestTwo {
public static void main(String[] args) {
//创建DocumentBuilderFactory对象
DocumentBuilderFactory a = DocumentBuilderFactory.newInstance();
try {
//创建DocumentBuilder对象
DocumentBuilder b = a.newDocumentBuilder();
//通过DocumentBuilder对象的parse方法返回一个Document对象
Document document = b.parse("booktwo.xml");
//通过Document对象的getElementsByTagName()返根节点的一个list集合
NodeList bookList = document.getElementsByTagName("book");
for(int i =0; i<bookList.getLength(); i++){
System.out.println("========开始遍历第"+(i+1)+"本书========");
//获取id的属性值
System.out.println("id:"+document.getElementsByTagName("id").item(i).getFirstChild().getNodeValue());
//获取name的属性值
System.out.println("name:"+document.getElementsByTagName("name").item(i).getFirstChild().getNodeValue());
//获取author的属性值
System.out.println("author:"+document.getElementsByTagName("author").item(i).getFirstChild().getNodeValue());
//获取year的属性值
System.out.println("year:"+document.getElementsByTagName("year").item(i).getFirstChild().getNodeValue());
//获取price的属性值
System.out.println("price:"+document.getElementsByTagName("price").item(i).getFirstChild().getNodeValue());
System.out.println("========结束遍历第"+(i+1)+"本书========");
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
运行结果: