近期整理了以前的程式碼，將XML檔案的解析程式碼程式設計了一個工具。通過Document類得到一個NodeList，遍歷其得到標籤，通過標籤得到XML檔案的內容。利用抽象方法提供給使用者處理檔案的介面。程式碼如下：

/*
 * @auther yc
 * 2018/10/13
 */
package yc_util.core;

import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public abstract class XMLReader {
	private static DocumentBuilder documentBuilder;
	
	public XMLReader() {
	}
	
	private static void init() {
		try {
			documentBuilder = DocumentBuilderFactory
					.newInstance()
					.newDocumentBuilder();
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		}
	}
	
	public static Document document(InputStream is) {
		Document document = null;
		init();
		try {
			document = documentBuilder.parse(is);
		} catch (SAXException | IOException e) {
			e.printStackTrace();
		}
		
		return document;
	}
	
	public static Document document(String path) {
		InputStream inputStream = XMLReader.class.getResourceAsStream(path);
		return document(inputStream);
	}
	
	public abstract void dealElement(Element element, int index);
	
	public XMLReader xmlParse(Document document, String tagname) {
		NodeList nodeList = document.getElementsByTagName(tagname);
		
		for(int index = 0; index < nodeList.getLength(); index++) {
			Element element = (Element) nodeList.item(index);
			dealElement(element, index);
		}
		
		return this;
	} 
	
	public XMLReader xmlParse(Element element, String tagname) {
		NodeList nodeList = element.getElementsByTagName(tagname);
		
		for(int index = 0; index < nodeList.getLength(); index++) {
			Element ele = (Element) nodeList.item(index);
			dealElement(ele, index);
		}
		
		return this;
	} 
}
 

現在編寫一個Test測試一下

先編寫一個供測試的XML檔案：

<?xml version="1.0" encoding="UTF-8"?>
<bookStory> 
	<book id = "玄幻小說"> 
		<property name = "遮天" author = "辰東" price = "998美刀"></property>
		<property name = "完美世界" author = "辰東" price = "999美刀"></property>
	</book> 
	<book id = "文學小說">
		<property name = "巴黎聖母院" author = "不知道" price = "太貴了買不起"></property>
		<property name = "霧都孤兒" author = "真不知道" price = "太貴了嚇死人"></property>
	</book>
</bookStory>
 

接下來編寫測試類：

/*
 * @auther yc
 * 2018/10/13
 */
package yc_util.demo;

import org.w3c.dom.Element;

import yc_util.core.XMLReader;

public class XMLReaderDemo {

	public static void main(String[] args) {
		new XMLReader() {
			
			@Override
			public void dealElement(Element element, int index) {
				new XMLReader() {
					
					@Override
					public void dealElement(Element element, int index) {
						System.out.println("書名 :" + element.getAttribute("name") 
								+ " 作者:" + element.getAttribute("author")
								+ " 價格:" +element.getAttribute("price"));
					}
				}.xmlParse(element, "property");
			}
		}.xmlParse(XMLReader.document("/config.xml"), "book");
	}

}
 

使用起來就是這樣，輸出結果如下：