Java StAX解析器 - 解析XML文檔
演示示例
這是輸入需要解析 xml 文件：
StAXParserDemo.java
package com.yiibai.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"); Iterator<Attribute> attributes = 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(); } } }
這將產生以下結果：
Start Element : student
Roll No : 393
First Name: dinkar
Last Name: kad
Nick Name: dinkar
Marks: 85
End Element : student
Start Element : student
Roll No : 493
First Name: Vaneet
Last Name: Gupta
Nick Name: vinni
Marks: 95
End Element : student
Start Element : student
Roll No : 593
First Name: jasvir
Last Name: singn
Nick Name: jazz
Marks: 90
End Element : student