xml文件:
<?
xml version="1.0" encoding="GB2312" standalone="no"
?>
<
books
>
<
book
email
="zhoujunhui"
>
<
name
>
rjzjh
</
name
>
<
price
>
jjjjjj
</
price
>
</
book
>
</
books
>
代码:
import
java.io.FileInputStream;
import
java.io.FileNotFoundException;
import
java.io.IOException;
import
java.io.InputStream;
import
javax.xml.parsers.DocumentBuilder;
import
javax.xml.parsers.DocumentBuilderFactory;
import
javax.xml.parsers.ParserConfigurationException;
//
下面主要是org.xml.sax包的类
import
org.w3c.dom.Document;
import
org.w3c.dom.Element;
import
org.w3c.dom.Node;
import
org.w3c.dom.NodeList;
import
org.xml.sax.SAXException;
![](http://www.blogjava.net/Images/OutliningIndicators/None.gif?x-oss-process=image/resize,w_1400/format,webp)
public
class
DomParse
{
![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif?x-oss-process=image/resize,w_1400/format,webp)
public DomParse(){
//(1)得到DOM解析器的工厂实例
DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance();
//得到javax.xml.parsers.DocumentBuilderFactory;类的实例就是我们要的解析器工厂
try {
//(2)从DOM工厂获得DOM解析器
DocumentBuilder dombuilder=domfac.newDocumentBuilder();
//通过javax.xml.parsers.DocumentBuilderFactory实例的静态方法newDocumentBuilder()得到DOM解析器
//(3)把要解析的XML文档转化为输入流,以便DOM解析器解析它
InputStream is=new FileInputStream("test1.xml");
//(4)解析XML文档的输入流,得到一个Document
Document doc=dombuilder.parse(is);
//由XML文档的输入流得到一个org.w3c.dom.Document对象,以后的处理都是对Document对象进行的
//(5)得到XML文档的根节点
Element root=doc.getDocumentElement();
//在DOM中只有根节点是一个org.w3c.dom.Element对象。
//(6)得到节点的子节点
NodeList books=root.getChildNodes();
if(books!=null){
for(int i=0;i<books.getLength();i++){
Node book=books.item(i);
if(book.getNodeType()==Node.ELEMENT_NODE){
//(7)取得节点的属性值
String email=book.getAttributes().getNamedItem("email").getNodeValue();
System.out.println(email);
//注意,节点的属性也是它的子节点。它的节点类型也是Node.ELEMENT_NODE
//(8)轮循子节点
for(Node node=book.getFirstChild();node!=null;node=node.getNextSibling()){
if(node.getNodeType()==Node.ELEMENT_NODE){
if(node.getNodeName().equals("name")){
String name=node.getNodeValue();
String name1=node.getFirstChild().getNodeValue();
System.out.println(name);
System.out.println(name1);
}
if(node.getNodeName().equals("price")){
String price=node.getFirstChild().getNodeValue();
System.out.println(price);
}
}
}
}
}//(6)这是用一个org.w3c.dom.NodeList接口来存放它所有子节点的,还有一种轮循子节点的方法,后面有介绍
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif?x-oss-process=image/resize,w_1400/format,webp)
public static void main(String[] args) {
new DomParse();
}
}
![](http://www.blogjava.net/Images/OutliningIndicators/None.gif?x-oss-process=image/resize,w_1400/format,webp)
![](http://www.blogjava.net/Images/OutliningIndicators/None.gif?x-oss-process=image/resize,w_1400/format,webp)
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![](http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif?x-oss-process=image/resize,w_1400/format,webp)
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockEnd.gif?x-oss-process=image/resize,w_1400/format,webp)
这段代码的打印输出为:
null
alterrjzjh
jjjjjj
从上面可以看出
String name=node.getNodeValue();
是一个空值。而
String name1=node.getFirstChild().getNodeValue();
才是真正的值,这是因为DOM把<name>rjzjh</name>也当作是两层结构的节点,其父节点
本文转自博客园执着的笨蛋的博客,原文链接:java 读xml文件例子,如需转载请自行联系原博主。