【WebService】Stax的基本操作基于游标

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<bookstore>
    <book category="COOKING">
        <title lang="en">Giada De Laurentiis</title>
        <author>Lee</author>
        <year>2005</year>
        <price>30.00</price>
    </book>

    <book category="WEB">
        <title lang="en">JQuery</title>
        <author>Lee</author>
        <author>Sun</author>
        <author>James</author>
        <year>2015</year>
        <price>30.00</price>
    </book>
</bookstore>

 package com.slp.stax;

 import org.junit.Test;

 import javax.xml.stream.*;
 import javax.xml.stream.events.XMLEvent;
 import java.io.IOException;
 import java.io.InputStream;

 /**
  * Created by sanglp on 2017/2/26.
  */
 public class TestStax {

     /**
      * Bookstore

      book

      title
      Giada De Laurentiis
      /title

      author
      Lee
      /author

      year
      2005
      /year

      price
      30.00
      /price

      /book

      book

      title
      JQuery
      /title

      author
      Lee
      /author

      author
      Sun
      /author

      author
      James
      /author

      year
      2015
      /year

      price
      30.00
      /price

      /book

      /bookstore

      */
     @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
                 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());
                 }
                // System.out.println(reader.next());
             }
         } catch (XMLStreamException e) {
             e.printStackTrace();
         }finally {
             if(is!=null){
                 try {
                     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 {
             if(is!=null){
                 try {
                     is.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }

     /**
      * Giada De Laurentiis:30.00
      JQuery:30.00
      */
     @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 {
             if(is!=null){
                 try {
                     is.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }

     /**
      * Giada De Laurentiis:30.00
      * JQuery:30.00
      */
     @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);
             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");
                     }
                 }
             }
         } catch (XMLStreamException e) {
             e.printStackTrace();
         }finally {
             if(is!=null){
                 try {
                     is.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }

     /**
      * Giada De Laurentiis:30.00
      * JQuery:30.00
      */
     @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  可以有效的过滤不用进行操作的节点，效率会高一些
             XMLEventReader reader = factory.createFilteredReader(factory.createXMLEventReader(is),new EventFilter(){
                 public boolean accept(XMLEvent event){
                     //放true表示会显示，返回false表示不显示
                     if(event.isStartElement())
                         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++;
             }
         } catch (XMLStreamException e) {
             e.printStackTrace();
         }finally {
             if(is!=null){
                 try {
                     is.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }
 }