stax解析xml文档

1、基于光标的解析

XMLInputFactory factory=XMLInputFactory.newInstance();
InputStream is=null;

is=TestStax.class.getClassLoader().getResourceAsStream("books.xml");//获取xml文件
           XMLStreamReader reader=factory.createXMLStreamReader(is);
           while (reader.hasNext()){
               int type=reader.next();//XMLStreamReader分类型解析xml文本，XMLStreamReader提供常量来区分类型，分别有

XMLStreamConstants.START_ELEMENT元素，XMLStreamConstants.CHARACTERS文本等常量
               if(type==XMLStreamConstants.START_ELEMENT){
                   System.out.println(reader.getName());
               }else if(type==XMLStreamConstants.CHARACTERS){
                   System.out.println(reader.getName());
               }else if(type==XMLStreamConstants.END_ELEMENT){
                   System.out.println(reader.getName());
               }

2、基于迭代模型的方式，但效率不高，可增加过滤器实现高效率

XMLInputFactory factory=XMLInputFactory.newInstance();
       InputStream is=null;

       try {
           is=TestStax.class.getClassLoader().getResourceAsStream("books.xml");
           XMLEventReader reader=factory.createXMLEventReader(is);
           while (reader.hasNext()){
               XMLEvent event=reader.nextEvent();
               if(event.isStartElement()){
                   String name=event.asStartElement().getName().toString();
                   if("title".equals(name)){
                       System.out.println(reader.getElementText());
                   }
               }
           }

//增加过滤器

XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;

       try {
           is = TestStax.class.getClassLoader().getResourceAsStream(
                   "books.xml");
           XMLEventReader reader = factory.createFilteredReader(
                   factory.createXMLEventReader(is), new EventFilter() {

@Override
public boolean accept(XMLEvent event) {

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//这个地方增加过滤条件
                           if (event.isStartElement())
                               return true;
                           return false;
                       }

});

           while (reader.hasNext()) {
               XMLEvent event = reader.nextEvent();
               if (event.isStartElement()) {
                   String name = event.asStartElement().getName().toString();
                   if ("title".equals(name)) {
                       System.out.println(reader.getElementText());
                   }
               }
           }

3、基于xpath的解析

模板xml文件

<?xml version="1.0" encoding="UTF-8"?>

<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>

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