操作的books.xml
Everyday Italian Giada De Laurentiis 2005 30.00 Harry Potter J K. Rowling 2005 29.99 XQuery Kick Start James McGovern Per Bothner Kurt Cagle James Linn Vaidyanathan Nagarajan 2003 49.99 Learning XML Erik T. Ray 2003 39.95
测试类：
import java.io.IOException;import java.io.InputStream;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.stream.EventFilter;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.TransformerFactory;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.XPathFactory;import org.junit.Test;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.NodeList;public class TestStax { @Test /** * 读取xml的 * 获取book元素的属性和属性值 */ 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(); //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 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 /** * 读取title和price标签的值 Everyday Italian 30.00 */ 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 /** * 使用XMLEvent来读取title和price标签的值 * Everyday Italian * 30.00 */ 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++; } System.out.println(num); } catch (XMLStreamException e) { e.printStackTrace(); } finally { try { if(is!=null) is.close(); } catch (IOException e) { e.printStackTrace(); } } } @Test /** * 使用Filter过滤的不需要操作的元素，提高效率 * 同时使用XMLEvent */ public void test05() { XMLInputFactory factory = XMLInputFactory.newInstance(); InputStream is = null; try { is = TestStax.class.getClassLoader().getResourceAsStream("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++; } System.out.println(num); } catch (XMLStreamException e) { e.printStackTrace(); } finally { try { if(is!=null) is.close(); } catch (IOException e) { e.printStackTrace(); } } } @Test /** * 使用XPath和表达式精确定位元素(基于document的形式，在文档很大的情况下效率差) * 表达式：//book[@category='WEB'] * 意义：查找book元素的属性等于WEB的节点 */ public void test06() { InputStream is = null; try { is = TestStax.class.getClassLoader().getResourceAsStream("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