java使用SAX解析xml的代码实例

import java.io.File;import java.util.LinkedList;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; public class ParseXMLFileWithSAX extends DefaultHandler { private StringBuffer buffer = new StringBuffer();     private static String responseCode;    private static String date;    private static String title;     private static Currency currency;    private static Rates rates;     public static void main(String[] args) throws Exception {         DefaultHandler handler = new ParseXMLFileWithSAX();         SAXParserFactory factory = SAXParserFactory.newInstance();        factory.setValidating(false);         SAXParser parser = factory.newSAXParser();         parser.parse(new File("in.xml"), handler);         System.out.println("Response Code:" + responseCode);        System.out.println("Date:" + date);        System.out.println("Title:" + title);        System.out.println("Rates:");         for (Currency curr : rates.currencies) {            System.out.println("\tCode:" + curr.code + " - Rate:" + curr.rate);        }     }     private static class Currency {        public String code;        public String rate;    }     private static class Rates {        public List<Currency> currencies = new LinkedList<Currency>();    }     @Override    public void startElement(String uri, String localName, String qName,            Attributes attributes) throws SAXException {         buffer.setLength(0);         if (qName.equals("response")) {            responseCode = attributes.getValue("code");        }        else if (qName.equals("date")) {            date = "";        }        else if (qName.equals("title")) {            title = "";        }        else if (qName.equals("rates")) {            rates = new Rates();        }        else if (qName.equals("currency")) {            currency = new Currency();        }     }     @Override    public void endElement(String uri, String localName, String qName)throws SAXException {         if (qName.equals("date")) {            date = buffer.toString();        }        else if (qName.equals("title")) {            title = buffer.toString();        }        else if (qName.equals("currency")) {            rates.currencies.add(currency);        }        else if (qName.equals("code")) {            currency.code = buffer.toString();        }        else if (qName.equals("rate")) {            currency.rate = buffer.toString();        }     }     public void characters(char[] ch, int start, int length) {        buffer.append(ch, start, length);    } }

输入xml文件:

<?xml version="1.0" encoding="UTF-8" ?><response code="200">    <date>2008-11-07</date>    <title>Exchange rates for 2008-11-07</title>    <rates>        <currency>            <code>EUR</code>            <rate>1.220</rate>        </currency>        <currency>            <code>USD</code>            <rate>1.275</rate>        </currency>    </rates></response>

输出：

Response Code:200Date:2008-11-07Title:Exchange rates for 2008-11-07Rates:    Code:EUR - Rate:1.0    Code:USD - Rate:1.275600

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