sax封装xml文档数据

﹏ヽ暗。殇╰゛Y 2022-08-12 15:28 139阅读 0赞

有一个xml文档

<?xml version="1.0" encoding="UTF-8" standalone="no"?><书架>
    	<书>
    		<书名 name="xxxx">java web</书名>
    		<作者>张大</作者>
    		<价格>102</价格>
    	</书>
    	<书>
    		<书名>spring</书名>
    		<作者>呜呜</作者>
    		<价格>55</价格>
    	</书>
    </书架>

有一个javabean用来封装

package cn.itcast.sax;
    
    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;
    	}
    	
    }

解析如下

package cn.itcast.sax;
    
    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.XMLReader;
    import org.xml.sax.helpers.DefaultHandler;
    
    public class Demo3 {
    
    	public static void main(String[] args) throws Exception {
    		//1.创建工厂
    		SAXParserFactory saxP = SAXParserFactory.newInstance();
    		
    		//2.得到解析器
    		SAXParser parser = saxP.newSAXParser();
    		
    		//3.得到读取器
    		XMLReader xmlR = parser.getXMLReader();
    		
    		//4.设置内容处理器
    		BeanlistHandler bh = new BeanlistHandler();
    		xmlR.setContentHandler(bh);
    		//5.读取xml内容
    		xmlR.parse("src/book.xml");
    		List<Book> list = bh.getList();
    		System.out.println(list);
    		
    	}
    
    }
    
    class BeanlistHandler extends DefaultHandler{
    	private List list = new ArrayList();
    	private String currentTag;
    	private Book book;
    	
    	@Override
    	public void startElement(String uri, String localName, String qName,
    			Attributes attributes) throws SAXException {
    		currentTag = qName;
    		if("书".equals(currentTag)){
    			book = new Book();
    		}
    		
    	}
    
    	@Override
    	public void endElement(String uri, String localName, String qName)
    			throws SAXException {
    		if("书".equals(qName)){
    			list.add(book);
    			book = null;
    		}
    		currentTag = null;
    	}
    
    	@Override
    	public void characters(char[] ch, int start, int length)
    			throws SAXException {
    		if("书名".equals(currentTag)){
    			String name = new String(ch,start,length);
    			book.setName(name);
    		}
    		if("作者".equals(currentTag)){
    			String author = new String(ch,start,length);
    			book.setAuthor(author);
    		}
    		if("价格".equals(currentTag)){
    			String price = new String(ch,start,length);
    			book.setPrice(price);
    		}
    	}
    
    	public List getList() {
    		return list;
    	}
    	
    }