解析XML文件之汇总

于 2019-04-06 21:16:48 发布
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分类专栏： Java 文章标签： xml dom sax pull
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本文链接：https://blog.youkuaiyun.com/WZ18810463869/article/details/89060027
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XML资源：

API文档：https://docs.oracle.com/javase/8/docs/api/index.html

学习：https://www.w3cschool.cn/xml/

XML实战：

目标文件（res/book.xml）

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<书架>
    <书>
        <书名>Java</书名>
        <作者>张三</作者>
        <售价>10.00</售价>
    </书>
    <书>
        <书名>Python</书名>
        <作者>李四</作者>
        <售价>20.00</售价>
    </书>
</书架>

Dom解析：

DomParseTest.java

package com.example.test;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class DomParseTest {

	//读取第一本书的书名
	@Test
	public void domParse() {
		// TODO Auto-generated method stub
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		try {
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document document = builder.parse("res/book.xml");
			NodeList nodeList = document.getElementsByTagName("书名");
			Node node = nodeList.item(0);
			String content = node.getTextContent();
			System.out.println(content);
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//修改第一本书的书名
	@Test
	public void domModify() {
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		try {
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document document = builder.parse("res/book.xml");
			NodeList nodeList = document.getElementsByTagName("书名");
			Node node = nodeList.item(0);
			node.setTextContent("C++教程");
			
			TransformerFactory transformerFactory = TransformerFactory.newInstance();
			Transformer transformer = transformerFactory.newTransformer();
			Source xmlSource = new DOMSource(document);
			Result outputTarget = new StreamResult("res/book.xml");
			transformer.transform(xmlSource, outputTarget);
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (TransformerConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (TransformerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

SAX解析：

读取整个xml文件：SaxParserTest.java

package com.example.test;

import java.io.IOException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.junit.Test;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

public class SaxParserTest {

	//读取整个xml文件
	@Test
	public void saxParser() {
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			SAXParser parser = factory.newSAXParser();
			XMLReader reader = parser.getXMLReader();
			reader.setContentHandler(new MyHandler());
			reader.parse("res/book.xml");
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	private class MyHandler extends DefaultHandler{
		
		@Override
		public void startDocument() throws SAXException {
			// TODO Auto-generated method stub
			System.out.println("文档开始");
		}
		
		@Override
		public void endDocument() throws SAXException {
			// TODO Auto-generated method stub
			System.out.println("文档结束");
		}
		
		@Override
		public void startElement(String uri, String localName, String qName, Attributes attributes)
				throws SAXException {
			// TODO Auto-generated method stub
			System.out.println("开始标签");
		}
		
		@Override
		public void endElement(String uri, String localName, String qName) throws SAXException {
			// TODO Auto-generated method stub
			System.out.println("结束标签");			
		}
		
		@Override
		public void characters(char[] ch, int start, int length) throws SAXException {
			// TODO Auto-generated method stub
			String text = new String(ch, start, length);	
			System.out.println("文档内容" + text);
		}
	}

}

读取第一本书的售价：SaxParserTest.java

package com.example.test;

import java.io.IOException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.junit.Test;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

public class SaxParserTest {
	
	//读取第一本书的售价
	@Test
	public void saxParser() {
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			SAXParser parser = factory.newSAXParser();
			XMLReader reader = parser.getXMLReader();
			reader.setContentHandler(new MyHandler());
			reader.parse("res/book.xml");
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	private class MyHandler extends DefaultHandler{
		
		boolean isPrice = false;
		int count = 0;
		
		@Override
		public void startElement(String uri, String localName, String qName, Attributes attributes)
				throws SAXException {
			// TODO Auto-generated method stub
			if ("售价".equals(qName)) {
				isPrice = true;
				count++;
			}
		}
		
		@Override
		public void endElement(String uri, String localName, String qName) throws SAXException {
			// TODO Auto-generated method stub
			if ("售价".equals(qName)) {
				isPrice = false;
			}
		}
		
		@Override
		public void characters(char[] ch, int start, int length) throws SAXException {
			// TODO Auto-generated method stub			
			if (isPrice && count ==1) {
				String text = new String(ch, start, length);
				System.out.println(text);
			}
		}
	}
	
}

将xml文件内容转换为ArrayList：Book.java

package com.example.test.bean;

public class Book {

	private String title;
	private String author;
	private String price;
	
	public String getTitle() {
		return title;
	}
	
	public void setTitle(String title) {
		this.title = title;
	}
	
	public String getAuthor() {
		return author;
	}
	
	public void setAuthor(String author) {
		this.author = author;
	}
	
	public String getPrice() {
		return price;
	}
	
	public void setPrice(String price) {
		this.price = price;
	}

	@Override
	public String toString() {
		return "Book [title=" + title + ", author=" + author + ", price=" + price + "]";
	}

}

 将xml文件内容转换为ArrayList：SaxParserTest.java

package com.example.test;

import java.io.IOException;
import java.util.ArrayList;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.junit.Test;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

import com.example.test.bean.Book;

public class SaxParserTest {
	
	//将xml文件内容转换为ArrayList
	@Test
	public void saxParser() {
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			SAXParser parser = factory.newSAXParser();
			XMLReader reader = parser.getXMLReader();
			reader.setContentHandler(new MyHandler());
			reader.parse("res/book.xml");
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	private class MyHandler extends DefaultHandler{
		
		ArrayList<Book> bookshelf = null;
		Book book = null;
		String tag = null;
		
		@Override
		public void startElement(String uri, String localName, String qName, Attributes attributes)
				throws SAXException {
			// TODO Auto-generated method stub
			if ("书架".equals(qName)) {
				bookshelf = new ArrayList<Book>();
			}else if ("书".equals(qName)) {
				book = new Book();
			}else if ("书名".equals(qName)) {
				tag = "书名";
			}else if ("作者".equals(qName)) {
				tag = "作者";
			}else if ("售价".equals(qName)) {
				tag = "售价";
			}
		}
		
		@Override
		public void endElement(String uri, String localName, String qName) throws SAXException {
			// TODO Auto-generated method stub
			tag = null;
			if ("书架".equals(qName)) {
				for (Book book : bookshelf) {
					System.out.println(book);
				}
			}else if ("书".equals(qName)) {
				bookshelf.add(book);
			}
		}
		
		@Override
		public void characters(char[] ch, int start, int length) throws SAXException {
			// TODO Auto-generated method stub			
			if (tag == "书名") {
				String title = new String(ch, start, length);
				book.setTitle(title);
			}else if (tag == "作者") {
				String author = new String(ch, start, length);
				book.setAuthor(author);
			}else if (tag == "售价") {
				String price = new String(ch, start, length);
				book.setPrice(price);
			}
		}
	}
	
}

Pull解析：

Book.java

package com.example.test.bean;

public class Book {

	private String title;
	private String author;
	private String price;
	
	public String getTitle() {
		return title;
	}
	
	public void setTitle(String title) {
		this.title = title;
	}
	
	public String getAuthor() {
		return author;
	}
	
	public void setAuthor(String author) {
		this.author = author;
	}
	
	public String getPrice() {
		return price;
	}
	
	public void setPrice(String price) {
		this.price = price;
	}

	@Override
	public String toString() {
		return "Book [title=" + title + ", author=" + author + ", price=" + price + "]";
	}

}

PullParserTest.java

package com.example.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;

import org.junit.Test;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import com.example.test.bean.Book;

public class PullParserTest {

	@Test
	public void testPullParser() {
		
		ArrayList<Book> books = null;
		Book book = null;
		
		try {
			XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
			XmlPullParser parser = factory.newPullParser();
			parser.setInput(new FileInputStream(new File("res/book.xml")), "UTF-8");
			int eventType = parser.getEventType();
			while (eventType != XmlPullParser.END_DOCUMENT) {
				switch (eventType) {
				case XmlPullParser.START_TAG:
					if ("书架".equals(parser.getName())) {
						books = new ArrayList<Book>();
					}else if ("书".equals(parser.getName())) {
						book = new Book();
					}else if ("书名".equals(parser.getName())) {
						book.setTitle(parser.nextText());
					}else if ("作者".equals(parser.getName())) {
						book.setAuthor(parser.nextText());
					}else if ("售价".equals(parser.getName())) {
						book.setPrice(parser.nextText());
					}
					break;
				case XmlPullParser.END_TAG:
					if ("书".equals(parser.getName())) {
						books.add(book);
					}
					break;
				default:
					break;
				}
				eventType = parser.next();
			}
		} catch (XmlPullParserException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		for (Book book2 : books) {
			System.out.println(book2);
		}
	}
	
}

 

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