JDOM 基本使用方式

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package com.bian.jdom;

import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.List;

import org.jdom.*;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;

public class Jdom {

    public Jdom() {
        super();
    }/*
    Attribute : org.jdom.Attribute
    Element : org.jdom.Element
    Comment : org.jdom.Comment
    Document: org.jdom.Document
    XMLOutputter: org.jdom.output.XMLOutputter
    SAXBuilder: org.jdom.input.SAXBuilder
    */
    
    public void CreateDocument(){
        //创建根元素
        Element eRoot = new Element("person");
        //为根元素创建属性
        eRoot.setAttribute(new Attribute("id", "13562986536525458954"));
        //为根元素添加注释内容
        eRoot.addContent(new Comment("A Person"));
        //创建根元素的子元素
        Element name = new Element("name");
        //为此元素创建内容
        name.addContent("xiaobian");
        //创建根元素的子元素
        Element sex = new Element("sex");
        sex.addContent("Male");
        //创建根元素的子元素
        Element year = new Element("year");
        year.addContent("1982");
        //创建根元素的子元素
        Element age = new Element("age");
        age.addContent("26");
       
        eRoot.addContent(name);
        eRoot.addContent(sex);
        eRoot.addContent(year);
        eRoot.addContent(age);
        for(int i=0;i<2600000;i++){
        	 //创建根元素的子元素
            Element height = new Element("height"+i);
           // height.setAttribute("state","China");
            height.addContent("178cm"+i);
        	eRoot.addContent(height);
        }
        Document d = new Document(eRoot);
        //定义输出 
        XMLOutputter outputter = new XMLOutputter();
        //输出流
        FileWriter writer = null;
        /* try {
             //输出到控制台
            outputter.output(d, System.out);
        } catch (java.io.IOException e) {
            e.printStackTrace();
        }*/
        
        try {
            //创建文件流
            writer = new FileWriter("c://test.xml");
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            //输出到Xml文件
            outputter.output(d, writer);
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            //关闭文件流
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(" "+Runtime.getRuntime().totalMemory()/1024/1024);
    }

    public static void ReadDocument()throws IOException,JDOMException{
    	SAXBuilder sb=new SAXBuilder(); 
         Document doc=sb.build("c:/test.xml"); //构造文档对象
         
         Element root=doc.getRootElement(); //获取根元素
         String rootName = root.getName();
         System.out.println("Type :"+rootName);
         Element name = root.getChild("name");
         System.out.println("Name: "+name.getText());
         Element sex = root.getChild("sex");
         System.out.println("Sex: "+sex.getText());
         Element year = root.getChild("year");
         System.out.println("Birth: "+year.getText());
         Element age = root.getChild("age");
         System.out.println("Age: "+age.getText()); 
         Element height = root.getChild("height");
         System.out.println("Height: "+height.getText());
         System.out.println("State: "+height.getAttributeValue("state"));	
         System.out.println(" "+Runtime.getRuntime().totalMemory()/1024/1024);
     	
    }
    
	public static void jdomTest() {
		String textXml = null;
		textXml = "<note>";
		textXml = textXml +
		"<to>aaa</to><from>bbb</from><heading>ccc</heading><body>ddd</body>";
		textXml = textXml + "</note>";
		
		SAXBuilder builder = new SAXBuilder();
	
		Document doc = null;
		Reader in = new StringReader(textXml);
		try {
			doc = builder.build(in);
			Element root = doc.getRootElement();
			List ls = root.getChildren();//注意此处取出的是root节点下面的一层的Element集合
			for (Iterator iter = ls.iterator(); iter.hasNext();) {
				Element el = (Element) iter.next();
				if (el.getName().equals("to")) {
					System.out.println(el.getText());
				}
			}
		}
		catch (IOException ex) {
			ex.printStackTrace();
		}
		catch (JDOMException ex) {
			ex.printStackTrace();
		}
	}
	public static void readRssFromUrl(){
		SAXBuilder saxBuilder = new SAXBuilder();
		URL url = null;
		Document doc = null;
		try {
				url = new URL("http://bbs.chinaunix.net/rss.php?fid=55&auth=0");
		} catch (MalformedURLException e) {
			e.printStackTrace();
		}
		if(url == null){System.exit(0);}
		try {
				doc = saxBuilder.build(url);
				Element elm = doc.getRootElement();
				Element e = (Element)elm.getChildren().get(0);
				List list = e.getChildren();
				for(int i=0;i<list.size();i++){
					Element element = (Element)list.get(i);
					if(element.getName().equals("item")){
						System.out.println("\n 标题： " + element.getChildText("title"));
						System.out.println("\n 内容: " + element.getChildText("description"));
					}
					//System.out.println(element.getName());
				}
				//System.out.println("||"+elm.getAttributeValue("encoding")+">>");
		} catch (JDOMException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
    /**
     * @param args
     * @throws JDOMException 
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException, JDOMException {
        Jdom jdom = new Jdom();
        //测试
        	jdom.readRssFromUrl();
        //jdom.ReadDocument();
        
        
    }
}

http://www.jdom.org/docs/apidocs/index.html

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