程序每运行一次,结果就会发生变化,并且还有异常,求大神解!
源代码:
package com.imooc.parseTest;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import org.jdom2.Attribute;
import org.jdom2.JDOMException;
import org.jdom2.input.SAXBuilder;
import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class ParseTest {
public void domXmlParser() {
ArrayList<Book> bookLists = new ArrayList<Book>();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
Document document = db.parse("f:\\books.xml");
NodeList bookList = document.getElementsByTagName("book");
for (int i = 0; i < bookList.getLength(); i++) {
Node book = bookList.item(i);
Book bookEntity = new Book();
NamedNodeMap attrs = book.getAttributes();
for (int j = 0; j < attrs.getLength(); j++) {
Node attr = attrs.item(j);
if (attr.getNodeName().equals("id")) {
bookEntity.setID(attr.getNodeValue());
}
}
NodeList childNodes = book.getChildNodes();
for (int k = 0; k < childNodes.getLength(); k++) {
if (childNodes.item(k).getNodeType() == Node.ELEMENT_NODE) {
String name = childNodes.item(k).getNodeName();
String value = childNodes.item(k).getFirstChild().getNodeValue();
if (name.equals("name")) {
bookEntity.setName(value);
}
else if (name.equals("author")) {
bookEntity.setAuthor(value);
}
else if (name.equals("year")) {
bookEntity.setYear(value);
}
else if (name.equals("price")) {
bookEntity.setPrice(value);
}
else if (name.equals("language")) {
bookEntity.setLanguage(value);
}
}
}
bookLists.add(bookEntity);
bookEntity = null;
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void saxXmlParser(){
SAXParserFactory factory = SAXParserFactory.newInstance();
try {
SAXParser parser = factory.newSAXParser();
SAXParseHandler handler = new SAXParseHandler();
parser.parse("f:\\books.xml", handler);
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void jdomXmlParser() {
ArrayList<Book> booksList = new ArrayList<Book>();
SAXBuilder saxBuilder = new SAXBuilder();
InputStream in;
try {
in = new FileInputStream("f:\\books.xml");
InputStreamReader isr = new InputStreamReader(in, "UTF-8");
org.jdom2.Document document = saxBuilder.build(isr);
org.jdom2.Element rootElement = document.getRootElement();
List<org.jdom2.Element> bookList = rootElement.getChildren();
for (org.jdom2.Element book : bookList) {
Book bookEntity = new Book();
List<Attribute> attrList = book.getAttributes();
for (Attribute attr : attrList) {
String attrName = attr.getName();
String attrValue = attr.getValue();
if (attrName.equals("id")) {
bookEntity.setID(attrValue);
}
}
List<org.jdom2.Element> bookChilds = book.getChildren();
for (org.jdom2.Element child : bookChilds) {
if (child.getName().equals("name")) {
bookEntity.setName(child.getValue());
}
else if (child.getName().equals("author")) {
bookEntity.setAuthor(child.getValue());
}
else if (child.getName().equals("year")) {
bookEntity.setYear(child.getValue());
}
else if (child.getName().equals("price")) {
bookEntity.setPrice(child.getValue());
}
else if (child.getName().equals("language")) {
bookEntity.setLanguage(child.getValue());
}
}
booksList.add(bookEntity);
bookEntity = null;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (JDOMException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void dom4jXmlParser(){
ArrayList<Book> booksList = new ArrayList<Book>();
SAXReader reader = new SAXReader();
try {
org.dom4j.Document document = reader.read(new File("f:\\books.xml"));
org.dom4j.Element bookStore = document.getRootElement();
List<org.dom4j.Element> bookEles = bookStore.elements();
for (org.dom4j.Element book : bookEles) {
Book bookEntity = new Book();
List<org.dom4j.Attribute> bookAttrs = book.attributes();
for (org.dom4j.Attribute attr : bookAttrs) {
if (attr.getName().equals("id")) {
bookEntity.setID(attr.getValue());
}
}
List<org.dom4j.Element> bookss = book.elements();
for (org.dom4j.Element bookChild : bookss) {
String name = bookChild.getName();
String value = bookChild.getStringValue();
if (name.equals("name")) {
bookEntity.setName(value);
}
else if (name.equals("author")) {
bookEntity.setAuthor(value);
}
else if (name.equals("year")) {
bookEntity.setYear(value);
}
else if (name.equals("price")) {
bookEntity.setPrice(value);
}
else if (name.equals("language")) {
bookEntity.setLanguage(value);
}
}
booksList.add(bookEntity);
bookEntity = null;
}
} catch (DocumentException e) {
e.printStackTrace();
}
}
@Test
public void testPerformance() throws Exception{
System.out.println("性能测试:");
//测试DOM的性能:
long start = System.currentTimeMillis();
domXmlParser();
System.out.println("DOM:"+ (System.currentTimeMillis() - start) );
//测试SAX的性能:
start = System.currentTimeMillis();
saxXmlParser();
System.out.println("SAX:"+ (System.currentTimeMillis() - start) );
//测试JDOM的性能:
start = System.currentTimeMillis();
jdomXmlParser();
System.out.println("JDOM:"+ (System.currentTimeMillis() - start) );
//测试DOM4J的性能:
start = System.currentTimeMillis();
dom4jXmlParser();
System.out.println("DOM4J:"+ (System.currentTimeMillis() - start) );
}
}
运行结果:
性能测试:
DOM:29
SAX:4
org.jdom2.input.JDOMParseException: Error on line 1: 前言中不允许有内容。
at org.jdom2.input.sax.SAXBuilderEngine.build(SAXBuilderEngine.java:232)
at org.jdom2.input.sax.SAXBuilderEngine.build(SAXBuilderEngine.java:303)
at org.jdom2.input.SAXBuilder.build(SAXBuilder.java:1196)
at com.imooc.parseTest.ParseTest.jdomXmlParser(ParseTest.java:105)
at com.imooc.parseTest.ParseTest.testPerformance(ParseTest.java:205)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; 前言中不允许有内容。
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1437)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:999)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:118)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
at org.jdom2.input.sax.SAXBuilderEngine.build(SAXBuilderEngine.java:217)
... 27 more
JDOM:56
DOM4J:46