VTD xml 和 SAX xml 性能测试

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测试的xml文件大小分别是003K,010K,184K,744K

VTD用com.ximpleware.vtd-xml,version is 2.13

SAX用sax.sax,version is 2.0.1

测试功能只实现了 解析,并没有向POJO去映射,困为这种POJO映射行为是统一的,没什么区别,我们单单测试 xml parsor 性能

SumTimeMS表示解析100次的总时间,单位是毫秒

============================================

xmlSizeKB, vtdSumTimeMS,saxSumTimeMS

003K, 137MS, 192MS
010K, 189MS, 237MS
184K, 454MS, 402MS
744K, 606MS, 587MS
============================================

从测试结果来看

如果文件比较小,大概010K左右,vtd性能可以提高16%左右。

如果文件比较大,大概100K左右,vtd性能开始慢了,没有sax性能好。

测试数据和测试方法,应该没什么问题

vtd号称The World Fastest XML Parsor,看来,也不怎么样。


package com.jelly;

import com.ximpleware.VTDGen;
import com.ximpleware.VTDNav;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.BufferedInputStream;
import java.io.InputStream;

public class XmlPerf {
    private static final String xml = "/myDoc744.xml";

    public static void main(String[] args) throws Exception {
        long sum = 0;
        for(int i = 0; i < 100; i++){
            long s = System.currentTimeMillis();
//            vtdTest();
            saxTest();
            long e = System.currentTimeMillis();

            sum += (e - s);
        }

        double sumD = (double)sum;
        System.out.println("sumMS=" + sumD + ",avgMS=" + sumD/10D);
    }

    private static void vtdTest() throws Exception {
        InputStream is = XmlPerf.class.getResourceAsStream(xml);
        BufferedInputStream bis = new BufferedInputStream(is);
        byte[] b = new byte[is.available()];
        bis.read(b);
        bis.close();

        VTDGen vg = new VTDGen();
        vg.setDoc(b);
        vg.parse(false);

        VTDNav vn = vg.getNav();
        int size = vn.getTokenCount();
        for (int i = 0; i < size; i++) {
            vn.toString(i).trim();
        }

        vg.clear();
    }

    private static void saxTest() throws Exception {
        DefaultHandler handler = new DefaultHandler(){
            @Override
            public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException {
//                System.out.println("qName=" + qName);
            }

            @Override
            public void endElement(String uri,String qName) throws SAXException {
//                System.out.println("qName=" + qName);
            }

            @Override
            public void characters(char[] ch,int start,int length) throws SAXException {
//                System.out.println("content>>>" + new String(ByteBuffer.wrap(ch,start,length)));
            }
        };

        InputStream is = XmlPerf.class.getResourceAsStream(xml);
        BufferedInputStream bis = new BufferedInputStream(is);
        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser saxParser = factory.newSAXParser();
        saxParser.parse(bis,handler);
        bis.close();
    }
}

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