演示示例
以下是我们需要解析的输入xml文件;
Dinkar Kad Dinkar 85 Vineet Gupta Vinni 95 Jasvir Singh Jazz 90
StAXParserDemo.java
package com.it1352.XML; import java.io.FileNotFoundException;import java.io.FileReader;import java.util.Iterator;import javax.xml.stream.XMLEventReader;import javax.xml.stream.XMLInputFactory;import javax.xml.stream.XMLStreamConstants;import javax.xml.stream.XMLStreamException;import javax.xml.stream.events.Attribute;import javax.xml.stream.events.Characters;import javax.xml.stream.events.EndElement;import javax.xml.stream.events.StartElement;import javax.xml.stream.events.XMLEvent;public class StAXParserDemo { public static void main(String[] args) { boolean bFirstName = false; boolean bLastName = false; boolean bNickName = false; boolean bMarks = false; try { XMLInputFactory factory = XMLInputFactory.newInstance(); XMLEventReader eventReader = factory.createXMLEventReader(new FileReader("input.txt")); while(eventReader.hasNext()){ XMLEvent event = eventReader.nextEvent(); switch(event.getEventType()){ case XMLStreamConstants.START_ELEMENT: StartElement startElement = event.asStartElement(); String qName = startElement.getName().getLocalPart(); if (qName.equalsIgnoreCase("student")) { System.out.println("Start Element : student"); Iteratorattributes = startElement.getAttributes(); String rollNo = attributes.next().getValue(); System.out.println("Roll No : " + rollNo); } else if (qName.equalsIgnoreCase("firstname")) { bFirstName = true; } else if (qName.equalsIgnoreCase("lastname")) { bLastName = true; } else if (qName.equalsIgnoreCase("nickname")) { bNickName = true; } else if (qName.equalsIgnoreCase("marks")) { bMarks = true; } break; case XMLStreamConstants.CHARACTERS: Characters characters = event.asCharacters(); if(bFirstName){ System.out.println("First Name: " + characters.getData()); bFirstName = false; } if(bLastName){ System.out.println("Last Name: " + characters.getData()); bLastName = false; } if(bNickName){ System.out.println("Nick Name: " + characters.getData()); bNickName = false; } if(bMarks){ System.out.println("Marks: " + characters.getData()); bMarks = false; } break; case XMLStreamConstants.END_ELEMENT: EndElement endElement = event.asEndElement(); if(endElement.getName().getLocalPart().equalsIgnoreCase("student")){ System.out.println("End Element : student"); System.out.println(); } break; } } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (XMLStreamException e) { e.printStackTrace(); } }}
上述程序将产生以下结果 :
Start Element : studentRoll No : 393First Name: DinkarLast Name: KadNick Name: DinkarMarks: 85End Element : studentStart Element : studentRoll No : 493First Name: VineetLast Name: GuptaNick Name: VinniMarks: 95End Element : studentStart Element : studentRoll No : 593First Name: JasvirLast Name: SinghNick Name: JazzMarks: 90End Element : student