Sample code for reading XML files using SAX method

XMLFile

<?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>

handler.java class

package xmltes;

import javax.xml.stream.events.Characters;
import javax.xml.stream.events.StartElement;

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


public class handler extends DefaultHandler{
    private static int bookNum = 0;
    //遍历xml文件的开始标签
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        // 调用DefaultHandler父类的startElement方法
        super.startElement(uri, localName, qName, attributes);
        
        //判断是不是有属性的标签/如book
        if(qName.equals("book")){
            bookNum++;
            System.out.println("====================开始遍历第"+bookNum+"书的内容================");
            //开始解析book元素
            //已知book元素下属性的名称，可以根据名称判断
           /* String value = attributes.getValue("id");
            System.out.println("book的属性值是" + value);*/
            //如果不知道数的属性名称
            int num = attributes.getLength();
            
            for(int i=0;i<num;i++){
                System.out.println("书的第" + (i+1) + "个属性名是："+attributes.getQName(i)+"===属性值是：" + attributes.getValue(i));
            }
            
        }else if(!qName.equals("book") && !qName.equals("bookstore") ){
            System.out.println("节点名是：" + qName);
        }
        
        
        
        
    }
    //遍历xml文件的结束标签
    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        // TODO Auto-generated method stub
        super.endElement(uri, localName, qName);
        //判断这本书是否遍历结束
        if(qName.equals("book")){
            System.out.println("====================结束遍历第"+bookNum+"书的内容================");
        }
    }
    
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        // TODO Auto-generated method stub
        super.characters(ch, start, length);
        String value = new String(ch, start, length);
        if(!value.trim().equals("")){
            System.out.println(value);
        }
    }
    
    //用来标识解析开始
    @Override
    public void startDocument() throws SAXException {
        // TODO Auto-generated method stub
        super.startDocument();
//        System.out.println("进入标识解析开始方法");
    }
    
    //用来标识解析结束
    @Override
    public void endDocument() throws SAXException {
        // TODO Auto-generated method stub
        super.endDocument();
//        System.out.println("进入标识解析结束方法");
    }
    
}

Test class

package xmltes;

import java.io.IOException;

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

import org.xml.sax.SAXException;


public class SAXTest {
    public static void main(String[] args) {
        try {
            //获取一个SAXParserFactory的实例
            SAXParserFactory factory = SAXParserFactory.newInstance();
            //通过factory获取SAXParser实例
            SAXParser parser = factory.newSAXParser();
            //创建一个SAXParserHandler对象
            handler handler = new handler();
            parser.parse("001.xml", handler);
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

The above is the detailed content of Sample code for reading XML files using SAX method. For more information, please follow other related articles on the PHP Chinese website!