xml

book.xml

<?xml version="1.0" encoding="UTF-8"?>
<books>
	<book id="12">
		<name>编程思想</name>
		<price>85.5</price>
	</book>
	<book id="15">
		<name>核心内容</name>
		<price>39.0</price>
	</book>
</books>

package test.dom;
class Book {
	private int id;
	private String name;
	private float price;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public float getPrice() {
		return price;
	}
	public void setPrice(float price) {
		this.price = price;
	}
	@Override
	public String toString(){
		return "id："+this.id+"_书名:"+this.name+"_价格:"+this.price;
	}
}

package test.dom;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;


public class DomParseService {
	public static void main(String ars[]) throws Exception{
		DomParseService parseTest=new DomParseService();
		InputStream input = parseTest.getClass().getClassLoader().getResourceAsStream("book.xml");
		DomParseService dom = new DomParseService();
		List<Book> books = dom.getBooks(input);
		for(Book book : books){
			System.out.println(book.toString());
		}
	}
	public List<Book> getBooks(InputStream inputStream) throws Exception{
		List<Book> list = new ArrayList<Book>();
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		DocumentBuilder builder = factory.newDocumentBuilder();
		Document document = builder.parse(inputStream);
		Element element = document.getDocumentElement();
		
		NodeList bookNodes = element.getElementsByTagName("book");
		for(int i=0;i<bookNodes.getLength();i++){
			Element bookElement = (Element) bookNodes.item(i);
			Book book = new Book();
			book.setId(Integer.parseInt(bookElement.getAttribute("id")));
			NodeList childNodes = bookElement.getChildNodes();
//			System.out.println("*****"+childNodes.getLength());
			for(int j=0;j<childNodes.getLength();j++){
				if(childNodes.item(j).getNodeType()==Node.ELEMENT_NODE){
					if("name".equals(childNodes.item(j).getNodeName())){
						book.setName(childNodes.item(j).getFirstChild().getNodeValue());
					}else if("price".equals(childNodes.item(j).getNodeName())){
						book.setPrice(Float.parseFloat(childNodes.item(j).getFirstChild().getNodeValue()));
					}
				}
			}//end for j
			list.add(book);
		}//end for i
		return list;
	}
}

package test.dom;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

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 SaxParseService extends DefaultHandler {
	public static void main(String agString[]) throws Exception {
		SaxParseService sax = new SaxParseService();
		InputStream input = sax.getClass().getClassLoader().getResourceAsStream("book.xml");
		List<Book> books = sax.getBooks(input);
		for (Book book : books) {
			System.out.println(book.toString());
		}
	}

	private List<Book> books = null;
	private Book book = null;
	private String preTag = null;// 作用是记录解析时的上一个节点名称
	public List<Book> getBooks(InputStream xmlStream) throws Exception {
		SAXParserFactory factory = SAXParserFactory.newInstance();
		SAXParser parser = factory.newSAXParser();
		SaxParseService handler = new SaxParseService();
		parser.parse(xmlStream, handler);
		return handler.getBooks();
	}
	public List<Book> getBooks() {
		return books;
	}
	@Override
	public void startDocument() throws SAXException {
		books = new ArrayList<Book>();
	}
	@Override
	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
		if ("book".equals(qName)) {
			book = new Book();
			book.setId(Integer.parseInt(attributes.getValue(0)));
		}
		preTag = qName;// 将正在解析的节点名称赋给preTag
	}
	@Override
	public void endElement(String uri, String localName, String qName) throws SAXException {
		if ("book".equals(qName)) {
			books.add(book);
			book = null;
		}
		preTag = null;
		/**
		 * 当解析结束时置为空。这里很重要，例如，当图中画3的位置结束后，会调用这个方法 ，如果这里不把preTag置为null，根据startElement(....)方法，preTag的值还是book，当文档顺序读到图 中标记4的位置时，会执行characters(char[] ch, int start, int length)这个方法，而characters(....)方 法判断preTag!=null，会执行if判断的代码，这样就会把空值赋值给book，这不是我们想要的。
		 */
	}

	@Override
	public void characters(char[] ch, int start, int length) throws SAXException {
		if (preTag != null) {
			String content = new String(ch, start, length);
			if ("name".equals(preTag)) {
				book.setName(content);
			} else if ("price".equals(preTag)) {
				book.setPrice(Float.parseFloat(content));
			}
		}
	}

}

package test;

import java.io.File;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class Dom4jReader {
	public static void main(String arge[]) {
		long lasting = System.currentTimeMillis();
		try {
			File f = new File("src/book.xml");
			SAXReader reader = new SAXReader();
			Document doc = reader.read(f);
			Element root = doc.getRootElement();
			Element foo;
			for (Iterator i = root.elementIterator("book"); i.hasNext();) {
				foo = (Element) i.next();
				System.out.print("书名:" + foo.elementText("name"));
				System.out.println("价格:" + foo.elementText("price"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import javax.xml.parsers.*;

public class SaxReader extends DefaultHandler {
	java.util.Stack tags = new java.util.Stack();
	public SaxReader() {
		super();
	}
	public static void main(String args[]) {
		long lasting = System.currentTimeMillis();
		try {
			SAXParserFactory sf = SAXParserFactory.newInstance();
			SAXParser sp = sf.newSAXParser();
			SaxReader reader = new SaxReader();
			sp.parse(new InputSource("src/book.xml"), reader);
		} catch (Exception e) {
			e.printStackTrace();
		}
		System.out.println("运行时间：" + (System.currentTimeMillis() - lasting) + "毫秒");
	}
	public void characters(char ch[], int start, int length) throws SAXException {
		String tag = (String) tags.peek();
		if (tag.equals("name")) {
			System.out.print("书名：" + new String(ch, start, length));
		}
		if (tag.equals("price")) {
			System.out.println("价格:" + new String(ch, start, length));
		}
	}
	public void startElement(String uri, String localName, String qName, Attributes attrs) {
		tags.push(qName);
	}
}


import java.io.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;

public class DomReader {
	public static void main(String arge[]) {
		long lasting = System.currentTimeMillis();
		try {
			File f = new File("src/book.xml");
			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document doc = builder.parse(f);
			NodeList nl = doc.getElementsByTagName("book");
			for (int i = 0; i < nl.getLength(); i++) {
				System.out.print("书名:" + doc.getElementsByTagName("name").item(i).getFirstChild().getNodeValue());
				System.out.println("价格:" + doc.getElementsByTagName("price").item(i).getFirstChild().getNodeValue());
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}