JavaStax如何实现解析XML-创新互联

这篇文章运用简单易懂的例子给大家介绍Java Stax如何实现解析XML，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

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            

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