初探XML

<?xml version="1.0" encoding="UTF-8"?>
<xml-body>
<book>
<name>Java开发</name>
<author>刚哥</author>
</book>
<book>
<name>C++开发</name>
<author>虎哥</author>
</book>
</xml-body>

import java.io.File;
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.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class ReadXml {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
//获得XML文件目录
File xmlFile = new File("WebRoot/xmlDemo.xml");
//利用DOM解析我们就需要Document对象， 该对象有DocumentBuilder生成，获得DocumentBuilder
DocumentBuilder builder = null;
//DocumentBuilderFactory工厂产生builderFactory
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
try {
//利用builderFactory产生DocumentBuilder
builder = builderFactory.newDocumentBuilder();
try {
//获得Document
Document document = builder.parse(xmlFile);
//利用Document解析XML...
//解析XML的根元素
Element root = document.getDocumentElement();

NodeList childNodes = root.getChildNodes();
for (int i = 0; i < childNodes.getLength(); ++i) {
Node node = childNodes.item(i);
if (node.getNodeName().equals("book")) {
System.out.println("\r\n书籍信息:");
NodeList nodeDetails = node.getChildNodes();
for (int j = 0; j < nodeDetails.getLength(); ++j) {
Node details = nodeDetails.item(j);
if (details.getNodeName().equals("name")){
System.out.println("书名：" + details.getTextContent());
} else if (details.getNodeName().equals("author")) {
System.out.println("作者：" + details.getTextContent());
}
}
}
}

} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

注意导包问题..

import java.io.File;
import java.io.IOException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class ReadXMLBySAX extends DefaultHandler{
private String value;

//覆盖characters方法， 该方法用来处理元素中的字符
public void characters (char ch[], int start, int length)
throws SAXException
{
value = new String(ch, start, length);
}
//覆盖endElement方法，该方法用来处理元素中的字符
public void endElement (String uri, String localName, String qName) throws SAXException {
if (qName.equals("name")) {
System.out.println("书名" + value);
} else if (qName.equals("author")) {
System.out.println("作者" + value);
}
System.out.println();
}
//覆盖startElement方法，用来处理解析到元素的开始标签
public void startElement (String uri, String localName,String qName, Attributes attributes) throws SAXException {
if (qName.equals("book")) {
System.out.println("书籍信息：");
}
}

/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
File xmlFile = new File("WebRoot/xmlDemo.xml");
SAXParserFactory parserFactory = SAXParserFactory.newInstance();
try {
SAXParser parser = parserFactory.newSAXParser();
parser.parse(xmlFile, new ReadXMLBySAX());

} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}