jdom读写xml

原文：http://wuhongyu.iteye.com/blog/361842

要使用jdom解析xml文件，需要下载jdom的包，我使用的是jdom-1.1，附件中有。

xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<sys-config>
	<jdbc-info>
		<driver-class-name>oracle.jdbc.driver.OracleDriver</driver-class-name>
		<url>jdbc:oracle:thin:@localhost:1521:database</url>
		<user-name>why</user-name>
		<password>why</password>
	</jdbc-info>
	<provinces-info>
		<province id="hlj" name="黑龙江">
			<city id="harb">哈尔滨</city>
			<city id="nj">嫩江</city>
		</province>
		<province id="jl" name="吉林"></province>
	</provinces-info>
</sys-config>

 

读xml文件：文章中采用用了Xpath定位，以前我不知道。

package com.why.jdom;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import org.jdom.input.SAXBuilder;
import org.jdom.xpath.XPath;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;

public class ReadXML {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		SAXBuilder sax = new SAXBuilder();
		try {
			Document doc = sax.build("src/config.xml");
			Element rootEle = doc.getRootElement();
			Element driverClassNameElement = (Element)XPath.selectSingleNode(rootEle, "//sys-config/jdbc-info/driver-class-name");
			String driverClassName = driverClassNameElement.getText();
			System.out.println("driverClassName = " + driverClassName);
			
			List provinceList = XPath.selectNodes(rootEle, "//sys-config/provinces-info/province");
			for(Iterator it = provinceList.iterator();it.hasNext();){
				Element provinceEle = (Element)it.next();
				String proId = provinceEle.getAttributeValue("id");
				String proName = provinceEle.getAttributeValue("name");

				System.out.println("provinceId = " + proId + "   provinceName = " + proName);
				
				List cityEleList = (List)provinceEle.getChildren("city");
				
				for(Iterator cityIt = cityEleList.iterator();cityIt.hasNext();){
					Element cityEle = (Element)cityIt.next();
					String cityId = cityEle.getAttributeValue("id");
					String cityName = cityEle.getText();

					System.out.println("    cityId = " + cityId + "   cityName = " + cityName);
				}
			}
		} catch (JDOMException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		} catch (IOException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}

	}

}

 写xml文件：

package com.why.jdom;

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

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.XMLOutputter;

public class WriteXML {

		
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO 自动生成方法存根
		Element rootEle = new Element("sys-config");
		Element provincesEle = new Element("provinces-info");
		
		Element provinceEle = new Element("province");
		provinceEle.setAttribute("id","hlj");
		provinceEle.setAttribute("name","黑龙江省");
		
		Element cityEle1 = new Element("city");
		cityEle1.setAttribute("id","harb");
		cityEle1.addContent("哈尔滨");
		
		Element cityEle2 = new Element("city");
		cityEle2.setAttribute("id","nj");
		cityEle2.addContent("嫩江");
		
		
		provinceEle.addContent(cityEle1);
		provinceEle.addContent(cityEle2);
		provincesEle.addContent(provinceEle);
		rootEle.addContent(provincesEle);
		
		Document doc = new Document(rootEle);
		
		XMLOutputter out = new XMLOutputter();
		
		
//		out.setFormat(Format.getCompactFormat().setEncoding("GBK"));//设置文件编码，默认为UTF-8
		String xmlStr = out.outputString(doc);
		System.out.println(xmlStr);
		
		try {
			out.output(doc, new FileOutputStream("c:/test.xml"));
		} catch (FileNotFoundException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		} catch (IOException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}
		
	}

}