使用SAX解析XML

XML文件：

<?xml version="1.0" encoding="utf-8"?>
<persons>
	<person>
		<name>java小强</name>
		<sex>man</sex>
		<age>30</age>
	</person>
	<person>
		<name>崔素强</name>
		<sex>man</sex>
		<age>26</age>
	</person>
</persons>

 

为此建立响应的对象：

package com.test;
public class Xml {
	private String name;
	private String sex;
	private int age;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
}

 

参考的解析代码：

package com.test;

import java.io.FileInputStream;
import java.io.InputStream;
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.helpers.DefaultHandler;

/**
 * @说明 SAX解析XML
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
public class SaxDemo{
	public static void main(String[] args) {
		try {
			SaxDemo sd = new SaxDemo();
			String file = "C:\\p.xml"; // 文件存放位置
			sd.parserXml(file);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public void parserXml(String fileName) throws Exception {
		SAXParserFactory saxfac = SAXParserFactory.newInstance();
		SAXParser saxparser = saxfac.newSAXParser();
		InputStream is = new FileInputStream(fileName);
		SAXHandler sh = new SAXHandler();
		saxparser.parse(is, sh);
		List<Xml> list = sh.getPersons();
		System.out.println("====输出解析到的内容====");
		for(Xml x : list){
			System.out.println(x.getName() + "\t" + x.getSex() + "\t" + x.getAge());
		}
	}
}
class SAXHandler extends DefaultHandler {
	private List<Xml> list = null;
	private Xml xml = null;
	private String str = null;
	public List<Xml> getPersons() {
		return list;
	}
	public void startDocument() throws SAXException {
		list = new ArrayList<Xml>();
		System.out.println("XML解析开始");
	}
	public void endDocument() throws SAXException {
		System.out.println("XML解析结束");
	}
	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
		if("person".equals(qName)){
			xml = new Xml();
			System.out.println("开始实体解析");
		}
	}
	public void endElement(String uri, String localName, String qName) throws SAXException {
		if("name".equals(qName)){
			xml.setName(str);
		}
		if("sex".equals(qName)){
			xml.setSex(str);		
		}
		if("age".equals(qName)){
			xml.setAge(Integer.parseInt(str));
		}
		if("person".equals(qName)){
			list.add(xml);
			System.out.println("实体解析结束");
		}
	}
	// XML节点的内容会进入此方法
	public void characters(char[] ch, int start, int length) throws SAXException {
		str = new String(ch, start, length);
	}
}

 

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评论

1 楼 cuisuqiang 2013-09-02  

优点：不用事先调入整个文档，占用资源少；SAX解析器代码比DOM解析器代码小，适于Applet，下载。缺点：不是持久的；事件过后，若没保存数据，那么数据就丢了；无状态性；从事件中只能得到文本，但不知该文本属于哪个元素；使用场合：Applet;只需XML文档的少量内容，很少回头访问；机器内存少