Stax解析XML示例代码

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) {                    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    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    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<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 {                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");            //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");            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 {                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>