package com.zp.ws.test03; 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 { /** * 基于光标模型: * * 获取xml文件的元素和文本内容; */ @Test public void test01() { //实例化一个xml输入流工厂,创建一个xml文件读取器; XMLInputFactory factory = XMLInputFactory.newInstance(); InputStream is = null; try { //获取xml文件的的输入流; is = TestStax.class.getClassLoader().getResourceAsStream("com/zp/ws/test03/books.xml"); //创建一个XMLStreamReader,读取xml文件,获取相应内容; XMLStreamReader reader = factory.createXMLStreamReader(is); while(reader.hasNext()) { int type = reader.next(); /** * 判断节点类型是否是开始或者结束或者文本节点,之后根据情况及进行处理: * * START_ELEMENT:开始元素; * CHARACTERS:文本; * END_ELEMENT:结束元素; * * reader.getName()得先判断是什么节点,再输出name,否则会报错,因为文本节点没有name; */ 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 { //关闭读取xml文件的输入流; if(is!=null) is.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 基于光标模型: * * 获取指定元素名的属性名和属性值; */ @Test public void test02() { XMLInputFactory factory = XMLInputFactory.newInstance(); InputStream is = null; try { is = TestStax.class.getClassLoader().getResourceAsStream("com/zp/ws/test03/books.xml"); XMLStreamReader reader = factory.createXMLStreamReader(is); while(reader.hasNext()) { int type = reader.next(); if(type==XMLStreamConstants.START_ELEMENT) { String name = reader.getName().toString(); //获取元素名称为book的第一个属性名和属性值; if(name.equals("book")) { System.out.println(reader.getAttributeName(0)+":"+reader.getAttributeValue(0)); } } } } catch (XMLStreamException e) { e.printStackTrace(); } finally { try { //关闭读取xml文件的输入流; if(is!=null) is.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 基于光标模型: * * 获取xml文件指定元素的文本内容(元素的值) */ @Test public void test03() { XMLInputFactory factory = XMLInputFactory.newInstance(); InputStream is = null; try { is = TestStax.class.getClassLoader().getResourceAsStream("com/zp/ws/test03/books.xml"); XMLStreamReader reader = factory.createXMLStreamReader(is); while(reader.hasNext()) { int type = reader.next(); if(type==XMLStreamConstants.START_ELEMENT) { String name = reader.getName().toString(); //获取名为"title"的元素的文本内容(元素的值) if(name.equals("title")) { System.out.print(reader.getElementText()+":"); } //获取名为"price"的元素的文本内容(元素的值) if(name.equals("price")) { System.out.print(reader.getElementText()+"\n"); } } } } catch (XMLStreamException e) { e.printStackTrace(); } finally { try { //关闭读取xml文件的输入流; if(is!=null) is.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 基于迭代模型: * * 获取xml文件指定元素的文本内容(元素的值) * * 迭代次数:本次测试时85; * * 根据迭代次数和过滤模型相比,过滤模型的远高于迭代模型的; */ @Test public void test04() { XMLInputFactory factory = XMLInputFactory.newInstance(); InputStream is = null; try { is = TestStax.class.getClassLoader().getResourceAsStream("com/zp/ws/test03/books.xml"); //基于迭代模型的操作方式 XMLEventReader reader = factory.createXMLEventReader(is); int num = 0; while(reader.hasNext()) { //通过XMLEvent来获取是否是某种节点类型 XMLEvent event = reader.nextEvent(); if(event.isStartElement()) { //通过event.asxxx转换节点类型; 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++; } //返回迭代次数是:85; System.out.println(num); } catch (XMLStreamException e) { e.printStackTrace(); } finally { try { //关闭读取xml文件的输入流; if(is!=null) is.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 基于过滤模型: * * 获取xml文件指定元素的文本内容(元素的值) * * 加过滤器后的迭代次数:本次测试结果:8; * * 所以可以得到的结果是:使用过滤模型的效率远高于迭代模型; */ @Test public void test05() { XMLInputFactory factory = XMLInputFactory.newInstance(); InputStream is = null; try { is = TestStax.class.getClassLoader().getResourceAsStream("com/zp/ws/test03/books.xml"); //基于Filter的过滤方式,可以有效的过滤掉不用进行操作的节点,效率会高一些 XMLEventReader reader = factory.createFilteredReader(factory.createXMLEventReader(is), new EventFilter() { @Override public boolean accept(XMLEvent event) { //返回true表示会显示,返回false表示不显示 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()) { //通过XMLEvent来获取是否是某种节点类型 XMLEvent event = reader.nextEvent(); if(event.isStartElement()) { //通过event.asxxx转换节点 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++; } //返回迭代次数:8; System.out.println(num); } catch (XMLStreamException e) { e.printStackTrace(); } finally { try { //关闭读取xml文件的输入流; if(is!=null) is.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 基于XPath :XPath 是一门在 XML 文档中查找信息的语言; */ @Test public void test06() { InputStream is = null; try { is = TestStax.class.getClassLoader().getResourceAsStream("com/zp/ws/test03/books.xml"); //创建文档处理对象 DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder(); //通过DocumentBuilder创建doc的文档对象 Document doc = db.parse(is); //创建XPath XPath xpath = XPathFactory.newInstance().newXPath(); //第一个参数就是xpath,第二参数就是文档 NodeList list = (NodeList)xpath.evaluate("//book[@category='WEB']", doc,XPathConstants.NODESET); for(int i=0;i<list.getLength();i++) { //遍历输出相应的结果 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 { //关闭读取xml文件的输入流; if(is!=null) is.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 使用 XMLStreamWriter 创建 xml 文档: */ @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(); } } /** * 通过 Transformer 更新节点信息; */ @Test public void test08() { InputStream is = null; try { is = TestStax.class.getClassLoader().getResourceAsStream("com/zp/ws/test03/books.xml"); //创建文档处理对象 DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder(); //通过DocumentBuilder创建doc的文档对象 Document doc = db.parse(is); //创建XPath XPath xpath = XPathFactory.newInstance().newXPath(); Transformer tran = TransformerFactory.newInstance().newTransformer(); tran.setOutputProperty(OutputKeys.ENCODING,"UTF-8"); tran.setOutputProperty(OutputKeys.INDENT, "yes"); //第一个参数就是xpath,第二参数就是文档 NodeList list = (NodeList)xpath.evaluate("//book[title='Learning XML']", doc,XPathConstants.NODESET); //获取price节点 Element be = (Element)list.item(0); Element e = (Element)(be.getElementsByTagName("price").item(0)); e.setTextContent("333.9"); //通过输出流创建一个结果; Result result = new StreamResult(System.out); //通过tranformer修改节点 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 { //关闭读取xml文件的输入流; 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>