SAX对XML文件进行解析

package com.imooc.handler;

import java.util.ArrayList;

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

import com.imooc.entity.Book;


public class SAXParserHandler extends DefaultHandler {
	String value = null;
	Book book = null;
	private ArrayList<Book> bookList = new ArrayList<Book>();
	public ArrayList<Book> getBookList() {
		return bookList;
	}

	int bookIndex = 0;
	/**
	 * 用来标识解析开始
	 */
	@Override
	public void startDocument() throws SAXException {
		// TODO Auto-generated method stub
		super.startDocument();
		System.out.println("SAX解析开始");
	}
	
	/**
	 * 用来标识解析结束
	 */
	@Override
	public void endDocument() throws SAXException {
		// TODO Auto-generated method stub
		super.endDocument();
		System.out.println("SAX解析结束");
	}
	
	/**
	 * 解析xml元素
	 */
	@Override
	public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException {
		//调用DefaultHandler类的startElement方法
		super.startElement(uri,localName,qName,attributes);
		if (qName.equals("book")) {
			bookIndex++;
			//创建一个book对象
			book = new Book();
			//开始解析book元素的属性
			System.out.println("======================开始遍历某一本书的内容=================");
//			//已知book元素下属性的名称，根据属性名称获取属性值
//			String value = attributes.getValue("id");
//			System.out.println("book的属性值是：" + value);
			//不知道book元素下属性的名称以及个数，如何获取属性名以及属性值
			int num = attributes.getLength();
			for(int i = 0; i < num; i++){
				System.out.print("book元素的第" + (i + 1) +  "个属性名是："
						+ attributes.getQName(i));
				System.out.println("---属性值是：" + attributes.getValue(i));
				if (attributes.getQName(i).equals("id")) {
					book.setId(attributes.getValue(i));
				}
			}
		}
		else if (!qName.equals("name") && !qName.equals("bookstore")) {
			System.out.print("节点名是：" + qName + "---");
		}
	}
	
	@Override
	public void endElement(String uri,String qName)
			throws SAXException {
		//调用DefaultHandler类的endElement方法
		super.endElement(uri,qName);
		//判断是否针对一本书已经遍历结束
		if (qName.equals("book")) {
			bookList.add(book);
			book = null;
			System.out.println("======================结束遍历某一本书的内容=================");
		}
		else if (qName.equals("name")) {
			book.setName(value);
		}
		else if (qName.equals("author")) {
			book.setAuthor(value);
		}
		else if (qName.equals("year")) {
			book.setYear(value);
		}
		else if (qName.equals("price")) {
			book.setPrice(value);
		}
		else if (qName.equals("language")) {
			book.setLanguage(value);
		}
	}
	
	
	@Override
	public void characters(char[] ch,int start,int length)
			throws SAXException {
		// TODO Auto-generated method stub
		super.characters(ch,start,length);
		value = new String(ch,length);
		if (!value.trim().equals("")) {
			System.out.println("节点值是：" + value);
		}
	}
}

package com.imooc.entity;

public class Book {
	private String id;
	private String name;
	private String author;
	private String year;
	private String price;
	private String language;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getAuthor() {
		return author;
	}
	public void setAuthor(String author) {
		this.author = author;
	}
	public String getYear() {
		return year;
	}
	public void setYear(String year) {
		this.year = year;
	}
	public String getPrice() {
		return price;
	}
	public void setPrice(String price) {
		this.price = price;
	}
	public String getLanguage() {
		return language;
	}
	public void setLanguage(String language) {
		this.language = language;
	}
	
	
}

package com.imooc.entity;

public class Book {
	private String id;
	private String name;
	private String author;
	private String year;
	private String price;
	private String language;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getAuthor() {
		return author;
	}
	public void setAuthor(String author) {
		this.author = author;
	}
	public String getYear() {
		return year;
	}
	public void setYear(String year) {
		this.year = year;
	}
	public String getPrice() {
		return price;
	}
	public void setPrice(String price) {
		this.price = price;
	}
	public String getLanguage() {
		return language;
	}
	public void setLanguage(String language) {
		this.language = language;
	}
	
	
}

<?xml version="1.0" encoding="UTF-8"?>

-<bookstore>


-<book id="1">

<name>冰与火之歌</name>

<author>乔治马丁</author>

<year>2014</year>

<price>89</price>

</book>


-<book id="2">

<name>安徒生童话</name>

<year>2004</year>

<price>77</price>

<language>English</language>

</book>

</bookstore>

还没有总结，最近有点忙，大2了，很多事情由不得自己了

（编辑：李大同）

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