二、SAX解析XML

前端之家收集整理的这篇文章主要介绍了二、SAX解析XML前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。

解决DOM的问题,出现了SAX。SAX ,事件驱动。当解析器发现元素开始、元素结束、文本、文档的开始或结束等时,发送事件,程序员编写响应这些事件的代码,保存数据。

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;


package FourWayToAnalyticXml;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

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.helpers.DefaultHandler;

import Interface.XmlDocument;


* @author SAX文档解析


public class SAXToAnalyticXml implements XmlDocument {

//String fileName = "domparserXml";

public static void main(String[] args) {

// TODO Auto-generated method stub

SAXToAnalyticXml sax = new SAXToAnalyticXml();

sax.createXml("domparserXml");

sax.parserXml("domparserXml");

}

public void createXml(String fileName) {

System.out.println("<<" + fileName + ">>");

}

public void parserXml(String fileName) {

SAXParserFactory saxfac = SAXParserFactory.newInstance();

try {

SAXParser saxparser = saxfac.newSAXParser();

InputStream is = new FileInputStream(fileName);

saxparser.parse(is,new MySAXHandler());

} catch (ParserConfigurationException e) {

e.printStackTrace();

} catch (SAXException e) {

e.printStackTrace();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

class MySAXHandler extends DefaultHandler {

boolean hasAttribute = false;

Attributes attributes = null;

public void startDocument() throws SAXException {

System.out.println("文档开始打印了");

}

public void endDocument() throws SAXException {

System.out.println("文档打印结束了");

}

public void startElement(String uri,String localName,String qName,

Attributes attributes) throws SAXException {

if (qName.equals("employees")) {

return;

}

if (qName.equals("employee")) {

System.out.println(qName);

}

if (attributes.getLength() > 0) {

this.attributes = attributes;

this.hasAttribute = true;

}

}

public void endElement(String uri,String qName)

throws SAXException {

if (hasAttribute && (attributes != null)) {

for (int i = 0; i < attributes.getLength(); i++) {

System.out.println(attributes.getQName(0)

+ attributes.getValue(0));

}

}

}

public void characters(char[] ch,int start,int length)

throws SAXException {

System.out.println(new String(ch,start,length));

}

}

原文链接:https://www.f2er.com/xml/297475.html

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