解析XML

Jdom:Opensource，free
Commons_Configuration:Apache公司的
W3Cdom:已经被收录到java名下，在org.w3c.dom包中。

books.xml

<?xml version="1.0" encoding="UTF-8"?>
<books>
	<book>
		<name>哈里波特</name>
		<price>10</price>
		<memo>这是一本很好看的书。</memo>
	</book>
	<book id="B02">
		<name>三国演义</name>
		<price>10</price>
		<memo>四大名著之一。</memo>
	</book>
	<book id="B03">
		<name>水浒</name>
		<price>6</price>
		<memo>四大名著之一。</memo>
	</book>
	<book id="B04">
		<name>a</name>
		<price>5</price>
		<memo>四大名著之一。</memo>
	</book>
	
</books>

jdom解析:

package test;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.Iterator;
import java.util.List;

//下面是引用到JDOM中的类
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.Text;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
import org.jdom.xpath.XPath;

public class testJdom {
	public static void main(String[] args) {
		try {

			/*******************************************************************
			 * 解析books.xml
			 */
			String xPath = "./src/books.xml";
			// SAXBuilder负责从文件、流、URL等来构建一个JDOM document
			SAXBuilder builder = new SAXBuilder(false);
			Document doc = builder.build(xPath);
			Element books = doc.getRootElement();
			// 设置输出到控制台
			PrintStream pr = System.out;
			Format format = Format.getCompactFormat(); // 创建输出格式
			format.setEncoding("GBK"); // 编码
			format.setIndent("    ");
			XMLOutputter out = new XMLOutputter(format);
            
			// --- 新建一个元素 ----
			System.out.println("++++++++++++新增一本书开始++++++++++++");
			Element theBook = new Element("book");
			Element theElem = new Element("name");
			theElem.setText("新加的书名");
			Element thePrice = new Element("price");
			// 增加一个属性
			thePrice.setAttribute("incread", "yes");
			thePrice.setText("50");
			theBook.addContent(theElem);
			theBook.addContent(thePrice);
			books.addContent(theBook);
			out.output(doc, pr);
			System.out.println(out.toString());
			System.out.println("++++++++++++新增一本书结束++++++++++++");

			System.out.println("+++++++++++条件查询	++++++++++++");
			// --- 多个条件查询---
			// 选取books下的所有book元素
			List find1 = XPath.selectNodes(books, "/books/book");
			// 选取books下的所有book的子元素price>10的元素
			List find2 = XPath.selectNodes(books, "/books/book[price=10]");
			// 这里的查询不支持中文？？？？？？
			List find3 = XPath.selectNodes(books, "/books/book[name='a']");
			// 打印出是价钱是六块钱的书名
			String book1 = ((Text) XPath.selectSingleNode(books,
					"/books/book[price=6]/name/text()")).getTextNormalize();
			System.out.println(book1);
			// 选取所有 books 元素的 book 元素，且其中的 book 元素拥有名为 id 的属性。
			List find4 = XPath.selectNodes(books, "/books/book[@id]");
			// 选取所有 books 元素的 book 元素，且其中的 book 元素的id属性值须等于B02。
			List find5 = XPath.selectNodes(books, "/books/book[@id='B02']");

			// System.out.println("find.size" + find5.size() + "--");
			// Element findelement = (Element) find5.get(0);
			// out.output(findelement, pr);
			System.out.println("查询结束");

			
			
			
			System.out.println("+++++++++++删除、修改元素及属性（删除B02 三国演义）	++++++++++");

			Element eleB02 = (Element) XPath.selectSingleNode(books,
					"/books/book[@id='B02']");
			// 下面这条语句会把books中的所有子元素删除，添加此文本元素节点
			// --- books.setText("dfdfdfd");
			// 添加此文本元素节点
			// ---books.addContent("dfdfdfd");
			// 删除元素的第一种方法，先找到元素
			// --books.removeContent(eleB02);
			// 修改元素的属性
			eleB02.setAttribute("name", "三国演****义");
			//删除一个元素的属性
			//--eleB02.removeAttribute("属性名");
			out.output(books, pr);

			// 将文件写回到XML文件
			// out.output(doc,new FileOutputStream(xPath));

		} catch (Exception e) {
			e.printStackTrace();
			System.out.println(e.getMessage());
		}
	}
}

w3cDOM 解析

package test;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.w3c.dom.*;
import org.xml.sax.SAXException;

import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.*;
import javax.xml.xpath.*;

public class testDom {
	public static void main(String[] args) {
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		Element theBook = null, theElem = null, root = null;
		try {
			factory.setIgnoringElementContentWhitespace(true);

			DocumentBuilder db = factory.newDocumentBuilder();
			Document xmldoc = db.parse(new File("./src/books.xml"));
			root = xmldoc.getDocumentElement();

			// --- 新建一本书开始 ----
			theBook = xmldoc.createElement("book");
			theElem = xmldoc.createElement("name");
			theElem.setTextContent("新书");
			theBook.appendChild(theElem);

			theElem = xmldoc.createElement("price");
			theElem.setTextContent("20");
			theBook.appendChild(theElem);

			theElem = xmldoc.createElement("memo");
			theElem.setTextContent("新书的更好看。");
			theBook.appendChild(theElem);
			root.appendChild(theBook);
			System.out.println("---  新建一本书开始 ----");
			output(xmldoc);
			System.out.println("---  新建一本书完成 ----");
			// --- 新建一本书完成 ----

			// --- 下面对《哈里波特》做一些修改。 ----
			// --- 查询找《哈里波特》----
			theBook = (Element) selectSingleNode("/books/book[name='哈里波特']",
					root);
			System.out.println("---  查询找《哈里波特》 ----");
			output(theBook);
			// --- 此时修改这本书的价格 -----
			theBook.getElementsByTagName("price").item(0).setTextContent("15");// getElementsByTagName返回的是NodeList，所以要跟上item(0)
			System.out.println("---  此时修改这本书的价格 ----");
			output(theBook);
			// --- 另外还想加一个属性id，值为B01 ----
			theBook.setAttribute("id", "B01");
			System.out.println("---  另外还想加一个属性id，值为B01 ----");
			output(theBook);
			// --- 对《哈里波特》修改完成。 ----

			// --- 要用id属性删除《三国演义》这本书 ----
			theBook = (Element) selectSingleNode("/books/book[@id='B02']",
					root);
			System.out.println("---  要用id属性删除《三国演义》这本书 ----");
			output(theBook);
			theBook.getParentNode().removeChild(theBook);
			System.out.println("---  删除后的ＸＭＬ ----");
			output(xmldoc);

			// --- 再将所有价格低于10的书删除 ----
		
			NodeList someBooks = selectNodes("/books/book[price<10]", root);
			System.out.println("---  再将所有价格低于10的书删除  ---");
			System.out.println("---  符合条件的书有　" + someBooks.getLength()
					+ "本。  ---");
			for (int i = 0; i < someBooks.getLength(); i++) {
				someBooks.item(i).getParentNode()
						.removeChild(someBooks.item(i));
			}
			output(xmldoc);

			saveXml("Test1_Edited.xml", xmldoc);
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static void output(Node node) {// 将node的XML字符串输出到控制台
		TransformerFactory transFactory = TransformerFactory.newInstance();
		try {
			Transformer transformer = transFactory.newTransformer();
			transformer.setOutputProperty("encoding", "gb2312");
			transformer.setOutputProperty("indent", "yes");

			DOMSource source = new DOMSource();
			source.setNode(node);
			StreamResult result = new StreamResult();
			result.setOutputStream(System.out);

			transformer.transform(source, result);
		} catch (TransformerConfigurationException e) {
			e.printStackTrace();
		} catch (TransformerException e) {
			e.printStackTrace();
		}
	}

	public static Node selectSingleNode(String express, Object source) {// 查找节点，并返回第一个符合条件节点
		Node result = null;
		XPathFactory xpathFactory = XPathFactory.newInstance();
		XPath xpath = xpathFactory.newXPath();
		try {
			result = (Node) xpath
					.evaluate(express, source, XPathConstants.NODE);
		} catch (XPathExpressionException e) {
			e.printStackTrace();
		}

		return result;
	}

	public static NodeList selectNodes(String express, Object source) {// 查找节点，返回符合条件的节点集。
		NodeList result = null;
		XPathFactory xpathFactory = XPathFactory.newInstance();
		XPath xpath = xpathFactory.newXPath();
		try {
			result = (NodeList) xpath.evaluate(express, source,
					XPathConstants.NODESET);
		} catch (XPathExpressionException e) {
			e.printStackTrace();
		}

		return result;
	}

	public static void saveXml(String fileName, Document doc) {// 将Document输出到文件
		TransformerFactory transFactory = TransformerFactory.newInstance();
		try {
			Transformer transformer = transFactory.newTransformer();
			transformer.setOutputProperty("indent", "yes");

			DOMSource source = new DOMSource();
			source.setNode(doc);
			StreamResult result = new StreamResult();
			result.setOutputStream(new FileOutputStream(fileName));

			transformer.transform(source, result);
		} catch (TransformerConfigurationException e) {
			e.printStackTrace();
		} catch (TransformerException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}
}

Commons_Configuration解析

package test;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.XMLConfiguration;

public class testCommonsConfiguration {
	public static void main(String args[]) {

		try {
			String file = "./src/books.xml";
			XMLConfiguration config = new XMLConfiguration(file);
			System.out.println("成功加载:" + file);
			String btime = config.getString("book.name");
            System.out.println("书名:" + btime);
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

Commons_Configuration api:http://commons.apache.org/configuration/apidocs/index.html
jdom API:见附件