四种写入方式性能对比

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;

import org.dom4j.DocumentHelper;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

public class Demo {
    /**
     * DOM方式生成xml文档
     */
    public void DOMCreateXML() {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try {
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.newDocument();
            doc.setXmlStandalone(true);
            Element bookstore = doc.createElement("bookStore");
            Element book = doc.createElement("book");
            Element name = doc.createElement("name");
            name.setTextContent("冰与火之歌");
            book.appendChild(name);
            book.setAttribute("id", "1");
            bookstore.appendChild(book);
            doc.appendChild(bookstore);
            TransformerFactory tff = TransformerFactory.newInstance();
            Transformer tf = tff.newTransformer();
            tf.setOutputProperty(OutputKeys.INDENT, "yes");
            tf.transform(new DOMSource(doc), new StreamResult(new File("books1.xml")));
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerException e) {
            e.printStackTrace();
        }
    }
    /**
     * SAX方式生成xml文档
     */
    public void SAXCreateXML() {
        SAXTransformerFactory tff = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
        TransformerHandler handler;
        try {
            handler = tff.newTransformerHandler();
            Transformer tr = handler.getTransformer();
            tr.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
            tr.setOutputProperty(OutputKeys.INDENT, "yes");
            File file = new File("books2.xml");
            if(!file.exists()){
                file.createNewFile();
            }
            Result result = new StreamResult(new FileOutputStream(file));
            handler.setResult(result);
            handler.startDocument();
            AttributesImpl attr = new AttributesImpl();
            handler.startElement("", "", "bookStore", attr);
            attr.clear();
            attr.addAttribute("", "", "id", "", "1");
            handler.startElement("", "", "book", attr);
            attr.clear();
            handler.startElement("", "", "name", attr);
            handler.characters("冰与火之歌".toCharArray(), 0, "冰与火之歌".length());
            handler.endElement("", "", "name");
            handler.endElement("", "", "book");
            handler.endElement("", "", "bookStore");
            handler.endDocument();
        } catch (TransformerConfigurationException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }
    }
    /**
     * JDOM方式生成xml文档
     */
    public void JDOMCreateXML() {
        org.jdom2.Element bookstore = new org.jdom2.Element("bookStore");
        org.jdom2.Document doc = new org.jdom2.Document(bookstore);
        org.jdom2.Element book = new org.jdom2.Element("book");
        book.setAttribute("id","1");
        org.jdom2.Element name = new org.jdom2.Element("name");
        name.setText("冰与火之歌");
        book.addContent(name);
        bookstore.addContent(book);
        Format format = Format.getCompactFormat();
        format.setIndent("");
        format.setEncoding("UTF-8");
        XMLOutputter outputter = new XMLOutputter(format);
        try {
            outputter.output(doc, new FileOutputStream(new File("books3.xml")));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    /**
     * DOM4J方式生成xml文档
     */
    public void DOM4JCreateXML() {
        org.dom4j.Document document = DocumentHelper.createDocument();
        org.dom4j.Element bookstore = document.addElement("bookStore");
        org.dom4j.Element book = bookstore.addElement("book");
        book.addAttribute("id", "1");
        org.dom4j.Element name = book.addElement("name");
        name.setText("冰与火之歌");
        OutputFormat format = OutputFormat.createPrettyPrint();
        format.setEncoding("UTF-8");
        File file = new File("books4.xml");
        XMLWriter writer;
        try {
            writer = new XMLWriter(new FileOutputStream(file), format);
            writer.setEscapeText(false);
            writer.write(document);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    @Test
    public void testPerformance() throws Exception {
        System.out.println("性能测试：");
        // 测试DOM性能
        long start =System.currentTimeMillis();
        DOMCreateXML();
        System.out.println("DOM:"+(System.currentTimeMillis()-start));
        // 测试SAX性能
        start =System.currentTimeMillis();
        SAXCreateXML();
        System.out.println("SAX:"+(System.currentTimeMillis()-start));
        // 测试JDOM性能
        start =System.currentTimeMillis();
        JDOMCreateXML();
        System.out.println("JDOM:"+(System.currentTimeMillis()-start));
        // 测试DOM4J性能
        start =System.currentTimeMillis();
        DOM4JCreateXML();
        System.out.println("DOM4J:"+(System.currentTimeMillis()-start));
    }
}