Java Stax解析XML示例
更新時(shí)間：2020年09月28日 11:19:07 作者：H.U.C-王子
這篇文章主要介紹了Java Stax解析XML示例，幫助大家更好的理解和使用Java，感興趣的朋友可以了解下
package org.itat.stax;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.EventFilter;
import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.XMLEvent;
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.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class TestStax {
@Test
public void test01() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
XMLStreamReader reader = factory.createXMLStreamReader(is);
while(reader.hasNext()) {
int type = reader.next();
//判斷節(jié)點(diǎn)類型是否是開始或者結(jié)束或者文本節(jié)點(diǎn),之后根據(jù)情況及進(jìn)行處理
if(type==XMLStreamConstants.START_ELEMENT) {
System.out.println(reader.getName());
} else if(type==XMLStreamConstants.CHARACTERS) {
System.out.println(reader.getText().trim());
} else if(type==XMLStreamConstants.END_ELEMENT) {
System.out.println("/"+reader.getName());
}
}
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if(is!=null) is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test02() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
XMLStreamReader reader = factory.createXMLStreamReader(is);
while(reader.hasNext()) {
int type = reader.next();
if(type==XMLStreamConstants.START_ELEMENT) {
String name = reader.getName().toString();
if(name.equals("book")) {
System.out.println(reader.getAttributeName(0)+":"+reader.getAttributeValue(0));
}
}
}
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if(is!=null) is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test03() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
XMLStreamReader reader = factory.createXMLStreamReader(is);
while(reader.hasNext()) {
int type = reader.next();
if(type==XMLStreamConstants.START_ELEMENT) {
String name = reader.getName().toString();
if(name.equals("title")) {
System.out.print(reader.getElementText()+":");
}
if(name.equals("price")) {
System.out.print(reader.getElementText()+"\n");
}
}
}
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if(is!=null) is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test04() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
//基于迭代模型的操作方式
XMLEventReader reader = factory.createXMLEventReader(is);
int num = 0;
while(reader.hasNext()) {
//通過(guò)XMLEvent來(lái)獲取是否是某種節(jié)點(diǎn)類型
XMLEvent event = reader.nextEvent();
if(event.isStartElement()) {
//通過(guò)event.asxxx轉(zhuǎn)換節(jié)點(diǎn)
String name = event.asStartElement().getName().toString();
if(name.equals("title")) {
System.out.print(reader.getElementText()+":");
}
if(name.equals("price")) {
System.out.print(reader.getElementText()+"\n");
}
}
num++;
}
System.out.println(num);
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if(is!=null) is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test05() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
//基于Filter的過(guò)濾方式，可以有效的過(guò)濾掉不用進(jìn)行操作的節(jié)點(diǎn)，效率會(huì)高一些
XMLEventReader reader = factory.createFilteredReader(factory.createXMLEventReader(is),
new EventFilter() {
@Override
public boolean accept(XMLEvent event) {
//返回true表示會(huì)顯示，返回false表示不顯示
if(event.isStartElement()) {
String name = event.asStartElement().getName().toString();
if(name.equals("title")||name.equals("price"))
return true;
}
return false;
}
});
int num = 0;
while(reader.hasNext()) {
//通過(guò)XMLEvent來(lái)獲取是否是某種節(jié)點(diǎn)類型
XMLEvent event = reader.nextEvent();
if(event.isStartElement()) {
//通過(guò)event.asxxx轉(zhuǎn)換節(jié)點(diǎn)
String name = event.asStartElement().getName().toString();
if(name.equals("title")) {
System.out.print(reader.getElementText()+":");
}
if(name.equals("price")) {
System.out.print(reader.getElementText()+"\n");
}
}
num++;
}
System.out.println(num);
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if(is!=null) is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test06() {
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
//創(chuàng)建文檔處理對(duì)象
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
//通過(guò)DocumentBuilder創(chuàng)建doc的文檔對(duì)象
Document doc = db.parse(is);
//創(chuàng)建XPath
XPath xpath = XPathFactory.newInstance().newXPath();
//第一個(gè)參數(shù)就是xpath,第二參數(shù)就是文檔
NodeList list = (NodeList)xpath.evaluate("http://book[@category='WEB']", doc,XPathConstants.NODESET);
for(int i=0;i<list.getLength();i++) {
//遍歷輸出相應(yīng)的結(jié)果
Element e = (Element)list.item(i);
System.out.println(e.getElementsByTagName("title").item(0).getTextContent());
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (XPathExpressionException e) {
e.printStackTrace();
} finally {
try {
if(is!=null) is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test07() {
try {
XMLStreamWriter xsw = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);
xsw.writeStartDocument("UTF-8","1.0");
xsw.writeEndDocument();
String ns = "http://11:dd";
xsw.writeStartElement("nsadfsadf","person",ns);
xsw.writeStartElement(ns,"id");
xsw.writeCharacters("1");
xsw.writeEndElement();
xsw.writeEndElement();
xsw.flush();
xsw.close();
} catch (XMLStreamException e) {
e.printStackTrace();
} catch (FactoryConfigurationError e) {
e.printStackTrace();
}
}
@Test
public void test08() {
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
//創(chuàng)建文檔處理對(duì)象
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
//通過(guò)DocumentBuilder創(chuàng)建doc的文檔對(duì)象
Document doc = db.parse(is);
//創(chuàng)建XPath
XPath xpath = XPathFactory.newInstance().newXPath();
Transformer tran = TransformerFactory.newInstance().newTransformer();
tran.setOutputProperty(OutputKeys.ENCODING,"UTF-8");
tran.setOutputProperty(OutputKeys.INDENT, "yes");
//第一個(gè)參數(shù)就是xpath,第二參數(shù)就是文檔
NodeList list = (NodeList)xpath.evaluate("http://book[title='Learning XML']", doc,XPathConstants.NODESET);
//獲取price節(jié)點(diǎn)
Element be = (Element)list.item(0);
Element e = (Element)(be.getElementsByTagName("price").item(0));
e.setTextContent("333.9");
Result result = new StreamResult(System.out);
//通過(guò)tranformer修改節(jié)點(diǎn)
tran.transform(new DOMSource(doc), result);
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (XPathExpressionException e) {
e.printStackTrace();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (TransformerFactoryConfigurationError e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
} finally {
try {
if(is!=null) is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
<?xml version="1.0" encoding="UTF-8"?> <bookstore> <book category="COOKING"> <title lang="en">Everyday Italian</title> <author>Giada De Laurentiis</author> <year>2005</year> <price>30.00</price> </book> <book category="CHILDREN"> <title lang="en">Harry Potter</title> <author>J K. Rowling</author> <year>2005</year> <price>29.99</price> </book> <book category="WEB"> <title lang="en">XQuery Kick Start</title> <author>James McGovern</author> <author>Per Bothner</author> <author>Kurt Cagle</author> <author>James Linn</author> <author>Vaidyanathan Nagarajan</author> <year>2003</year> <price>49.99</price> </book> <book category="WEB"> <title lang="en">Learning XML</title> <author>Erik T. Ray</author> <year>2003</year> <price>39.95</price> </book> </bookstore>
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