Xml-Sax解析实例

xml文档-book.xml

<?xml version="1.0" encoding="UTF-8"?>
<书架>
 <书>
  <书名>Java就业基础教程</书名>
  <作者>张孝祥</作者>
  <售价>59</售价> 
 </书>
 <书>
  <书名>JavaScript网页开发</书名>
  <作者>黎活明</作者>
  <售价>46</售价>
 </书>s
</书架>

程序实现：获得两本书的数据(书名、作者、售价)保存到List集合中

封装数据的Book类

public class Book {
 private String name;
 private String author;
 private String price;
 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 getPrice() {
  return price;
 }
 public void setPrice(String price) {
  this.price = price;
 }
}

主运行的Sax类

import java.util.ArrayList;
import java.util.List;

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.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

public class Sax {

 public static void main(String[] args) throws ParserConfigurationException, Exception {
  //1.得到工厂
  SAXParserFactory factory = SAXParserFactory.newInstance();
  
  //2.创建解析器
  SAXParser sp = factory.newSAXParser();
  
  //3.获得读取器
  XMLReader reader = sp.getXMLReader();
  
  //4.设置内容处理器
  BookListHandler handler = new BookListHandler();
  reader.setContentHandler(handler);
  
  //5.读取xml文档
  reader.parse("src/book.xml");
  //6.得到xml文档内容
  List books = handler.getBooks();
  System.out.println(books);
 }
}

class BookListHandler extends DefaultHandler{
 List books = new ArrayList();
 String currentNode = null;
 Book book = null;
 @Override
 public void startElement(String uri, String localName, String name,
   Attributes attributes) throws SAXException {
  currentNode = name;
  if("书".equals(name)){
   book = new Book();
  }
 }
 @Override
 public void characters(char[] ch, int start, int length)
   throws SAXException {
  String value = new String(ch,start,length);
  if("书名".equals(currentNode)){
   book.setName(value);
  }
  if("作者".equals(currentNode)){
   book.setAuthor(value);
  }
  if("售价".equals(currentNode)){
   book.setPrice(value);
  }
 }

 @Override
 public void endElement(String uri, String localName, String name)
   throws SAXException {
  if("书".equals(name)){
   books.add(book);
   book = null;
  }
  currentNode = null;
 }
 public List getBooks(){
  return books;
 }
}