SAX方式，解析XML

xml文件

<bookstore>
<book category="COOKING">
    0
  <title lang="en">Everyday Italian</title> 1
  <author>Giada De Laurentiis</author> 2
  <year>2005</year> 3
  <price>30.00</price> 4
</book>
<book category="CHILDREN">
  <title lang="en">Harry Potter</title> 
  <author>J K. Rowling</author> 
  <year>2005</year> 
  <price>29.99</price> 
</book>
<book category="WEB">
  <title lang="en">Learning XML</title> 
  <author>Erik T. Ray</author> 
  <year>2003</year> 
  <price>39.95</price> 
</book>
</bookstore>

 

java文件

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

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

public class Main {
	public static void main(String[] args) throws SAXException,
			ParserConfigurationException, FileNotFoundException, IOException {
		// 工厂
		SAXParserFactory parserFactory = SAXParserFactory.newInstance();
		// reader
		XMLReader xmlReader = parserFactory.newSAXParser().getXMLReader();
		// XML Handler
		BookHandler handler = new BookHandler();

		// reader绑定handle
		xmlReader.setContentHandler(handler);

		// reader开始转换
		xmlReader.parse(new InputSource(new FileInputStream(
				"D:\\workspace\\SAXTest\\src\\1.xml")));

		// handler返回处理结果
		List<Book> list = handler.getList();

		for (Book book : list) {
			System.out.println("******************************");
			System.out.println("Book --");
			System.out.println("category: " + book.getCategory());
			System.out.println("title: " + book.getTitle());
			System.out.println("author: " + book.getAuthor());
			System.out.println("year: " + book.getYear());
			System.out.println("price: " + book.getPrice());
			System.out.println("******************************");
		}
	}
}

// XML Handler
class BookHandler extends DefaultHandler {

	// 所有Book
	private List<Book> list = null;

	// 存储<Tag -> index>映射
	private Map<String, Integer> map = new HashMap<String, Integer>();

	// 当前处理的Tag对应的index
	private int curTag = -1;

	// 当前处理的Book
	private Book book = null;

	public BookHandler() {
		map.put("bookstore", 0);

		map.put("book", 1);

		map.put("title", 2);
		map.put("author", 3);
		map.put("year", 4);
		map.put("price", 5);
	}

	public List<Book> getList() {
		return list;
	}

	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		super.startElement(uri, localName, qName, attributes);

		curTag = map.get(qName);

		switch (curTag) {
		case 0: {// 处理bookstore
			list = new ArrayList<Book>();
			break;
		}
		case 1: {// 处理book
			book = new Book();

			// 处理category
			book.setCategory(attributes.getValue("category"));
			break;
		}
		}
	}

	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		super.characters(ch, start, length);
		switch (curTag) {
		case 2: {// 处理title
			book.setTitle(new String(ch, start, length));
			break;
		}
		case 3: {// 处理author
			book.setAuthor(new String(ch, start, length));
			break;
		}
		case 4: {// 处理year
			book.setYear(new String(ch, start, length));
			break;
		}
		case 5: {// 处理price
			book.setPrice(new String(ch, start, length));
			break;
		}
		}
	}

	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		super.endElement(uri, localName, qName);

		if (1 == map.get(qName)) {// book
			list.add(book);
		} else {
			curTag = -1;
		}
	}
}

// JavaBean: Book
class Book {
	private String category;
	private String title;
	private String author;
	private String year;
	private String price;

	public void setCategory(String category) {
		this.category = category;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

	public void setYear(String year) {
		this.year = year;
	}

	public void setPrice(String price) {
		this.price = price;
	}

	public String getCategory() {
		return category;
	}

	public String getTitle() {
		return title;
	}

	public String getAuthor() {
		return author;
	}

	public String getYear() {
		return year;
	}

	public String getPrice() {
		return price;
	}
}