java 操作XML

本文使用jdom.jar跟jaxen-1.1.1.jar工具来进行XML的写入跟解析：

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
import com.boxun.bean.TestBean;

/**
 * xml读写测试
 * @author admin_Hzw
 *
 */
public class Test {

	public static void main(String[] args) throws Exception {
		List<TestBean> list = new ArrayList<TestBean>();
		for (int i = 0; i < 10000; i++) {
			TestBean t = new TestBean();
			t.setId(i);  
			t.setName("胡汉三");  
			t.setTel("110");
			list.add(t);  
		}
		writeXml(list);   
	}  

	/**
	 * 写入xml
	 * @param list
	 * @throws Exception
	 */
	public static void writeXml(List<TestBean> list) throws Exception{
		long wB = System.currentTimeMillis();
		/*
		 * 所有的XML元素都是 Element 的实例。根元素也不例外：
		 */
		Element rootElement = new Element("TestBean");  
		Document myDocument = new Document(rootElement);//以根元素作为参数创建Document对象。一个Document只有一个根，即root元素。
		for (int i = 0; i < list.size(); i++) {
			TestBean t = list.get(i);  
			Element iElement = new Element("B");//创建 name 元素
			iElement.setAttribute("id", t.getId()+"");
			rootElement.addContent(iElement);//将name元素作为content添加到根元素
			Element nameElement = new Element("name");//创建 name 元素
			nameElement.addContent(t.getName());//将kingwong作为content添加到name元素
			iElement.addContent(nameElement);//将name元素作为content添加到根元素
			Element telElement = new Element("tel");//创建 name 元素
			telElement.addContent(t.getTel());//将kingwong作为content添加到name元素
			iElement.addContent(telElement);//将name元素作为content添加到根元素
		}
		String path = "C://temp//temp"+System.currentTimeMillis()+new Random().nextInt(100000) ;
		//如果使用格式化，那么文件大小将会增大
		//XMLOutputter xmlOut = new XMLOutputter(Format.getPrettyFormat());
		XMLOutputter xmlOut = new XMLOutputter();
		File f = null;  
		try {   
			File ffFile = new File("C://temp");  
			if(!ffFile.exists()){
				ffFile.mkdir();
			}
			f = new File(path+".xml");
			if(f.exists()){
				f.delete();    
			}   
			f.createNewFile();   
			OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(f),"UTF-8");   
			BufferedWriter writer=new BufferedWriter(write);
			writer.write(xmlOut.outputString(myDocument));      
			writer.close();            
			long wN = System.currentTimeMillis();      
			System.out.println("写入用时："+(wN-wB)+"毫秒");
			readXMLContent(f) ; //解析
		} catch (IOException e) {            
			e.printStackTrace();       
		}
	}


	/**
	 * 解析XML
	 * @param f
	 */
	@SuppressWarnings("unchecked")
	public static void readXMLContent(File f) {
		long xB = System.currentTimeMillis();  
		SAXBuilder builder = new SAXBuilder();
		List<TestBean> listBean = new ArrayList<TestBean>();
		try {
			Document doc = builder.build(f);
			Element rootEl = doc.getRootElement();
			//获得所有子元素 
			List<Element> list = rootEl.getChildren();
			for (Element el : list) {
				TestBean t = new TestBean();
				//获取id属性值
				String id = el.getAttributeValue("id");
				t.setId(Integer.valueOf(id));
				//获取子元素文本值
				String name = el.getChildText("name");
				t.setName(name);
				String tel = el.getChildText("tel");
				t.setTel(tel);
				listBean.add(t);
			}  
		} catch (JDOMException e) {  
			e.printStackTrace();
		} catch (IOException e) {  
			e.printStackTrace();
		}
		long xN = System.currentTimeMillis();  
		System.out.println("解析用时："+(xN-xB)+"毫秒");  
		System.out.println("------"+listBean.size()); 
	}


}