JDOM解析处理xml

1.解析xml

package com.qingbyqing.xmlParse;
import java.io.IOException;
import java.util.List;

import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

/**
 * 解析xml
 * @author qingbyqing
 * @date 2011-3-29
 */
public class XmlPasreUtil {

	Element root=null;
	Document doc=null;
	
	/**
	 * 获得根元素
	 * @param fileName 用于指定的xml文件名
	 * @return 
	 */
	public  Element getRoot(String fileName){
		//1.创建解析对象
		//2.解析对象调用build方法建立文档对象
		//3.文档对象获得根元素
		SAXBuilder builder = new SAXBuilder(false);
		try {
			 doc = builder.build(fileName);
		} catch (JDOMException e) {
			
			e.printStackTrace();
		} catch (IOException e) {
			
			e.printStackTrace();
		}
		   Element root = doc.getRootElement();
		return root;
	}
	/**
	 * 获取xml的所有信息
	 * @param root 传入一个根元素对象
	 */
	public void getElementInfo(Element root){
		
		//遍历跟元素
		List<?> flist = root.getChildren("floor");
       for(int i=0;i<flist.size();i++){
    	     
    	   Element floor =(Element) flist.get(i);
    	   
    	   String level = floor.getAttributeValue("level");
     	  p("第"+level+"层");
    	   
    	  List<?> rlist = floor.getChildren("room");
    	 
    	  for(int j=0;j<rlist.size();j++){
    	 
    	   
    	  Element room = (Element)rlist.get(j);
    	 
    	    String id=room.getAttributeValue("id");
    	    
    	    String rep=room.getChild("represent").getText();
    	    String tel=room.getChild("telephone").getText();
    	    p("寝室编号："+id+"  负责人："+rep+"    寝室号码："+tel);
    	    
    	  }
       }
		
		
	}
	
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {

            XmlPasreUtil pasre = new XmlPasreUtil();
            
            Element root=pasre.getRoot("I:\\xml\\flats.xml");
            pasre.getElementInfo(root);
	}
	
	public void p(String str){
		System.out.println(str);
	}

}

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2.创建xml

package com.qingbyqing.xmlParse;

import java.io.FileWriter;
import java.io.IOException;

import org.jdom.Attribute;
import org.jdom.Comment;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

/**
 * 创建一个xml
 * @author qingbyqing
 * @date 2011-3-29
 */
public class XmlCreateUtil {
	 
	Element root=null;//跟元素
	Document doc=null;//文档对象
	 
	
	/**
	 * 创建xml
	 * @param ajax
	 */
	
	public void createRootElement(String[] ajaxs){
		
		//1.根据数组创建跟元素
		//2.建立解释内容
		//3.建立子元素
		
		
		 root = new Element("ajax");
		 
		 //建立解释内容
		 Comment comment = new Comment("简单的xml示例");
		 root.addContent(comment);
		 
		 //建立子元素
		 for(int i=0;i<ajaxs.length;i++){
			 Element ajax = new Element("ajax");//子元素标签
			 ajax.addContent(ajaxs[i]);//子元素内容
			 Attribute id = new Attribute("id",new Integer(i).toString());//子元素属性
			 
			 ajax.setAttribute(id);
			 root.addContent(ajax);
	
		 }			
	}
	
	public void outputXml(String fileName){
		    
		 //1.根据跟元素创建文档
		//2.创建输出对象
		//3.创建输出格式对象
		//4.格式化文档
		//5.创建文件输出对象
		//6.输出对象
		doc =new Document(root);
		XMLOutputter out = new XMLOutputter();
		Format format = Format.getPrettyFormat();
		//设置输出格式
		format.setIndent(" ");
		
		format.setEncoding("gbk");
		
		out.setFormat(format);
		
		try {
			FileWriter fwt = new FileWriter(fileName);
			out.output(doc, fwt);
			fwt.flush();
			fwt.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}		
	}
	
	public static void main(String args[]){
		
		String[] ajaxs={"JAVASCRIPT","HTML","CSS","DOM","XMLHTTPREQUEST"};
		
		  XmlCreateUtil cu = new XmlCreateUtil();
		  cu.createRootElement(ajaxs);
		  cu.outputXml("I:\\xml\\ajaxs.xml");
		
	}	
}

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3.修改xml

package com.qingbyqing.xmlParse;

import java.io.FileWriter;
import java.io.IOException;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

/**
 * 对xml进行修改删除
 * @author qingbyqing
 * @date 2011-3-29
 */

public class XmlMendUtil {
	private Document doc=null;
	
	//根据需要修改的文件创建文档
	public void setRootNode(String fileName){
		
		SAXBuilder builder = new SAXBuilder();
		try {
			doc=builder.build(fileName);
			
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	public void mendXml(){
		
		if(doc!=null){
			Element root = doc.getRootElement();
			root.removeContent(root.getChildren().size()-1);//删除最后一个元素
			
			//删除第一个元素下的id属性
			root.getChild("ajax").setAttribute("id", "3");
			root.getChild("ajax").removeContent();
			//修改第二个元素的内容为：DHTML
			root.getChild("ajax").addContent("DTML");				
		}
		
		return;	
	}
	public void outputXML(String fileName){
		
		   XMLOutputter out=new XMLOutputter();
		   Format format = Format.getPrettyFormat();
		   format.setEncoding("UTF-8");
		   format.setIndent(" ");
		   
		   out.setFormat(format);
		   
		   try {
			FileWriter fwt = new FileWriter(fileName);
			out.output(doc, fwt);
			fwt.flush();
			fwt.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		XmlMendUtil mend=new XmlMendUtil();
		mend.setRootNode("I:\\xml\\ajaxs.xml");
		
        mend.mendXml();
        mend.outputXML("I:\\xml\\mended.xml");
	}
}

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生成如下文件

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将jdom-jar导入到项目中去：
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