Dom4j 解析 XML文件

使用Dom4j 来创建 读取 修改 删除 打印 格式化 XML文档

//加入下面两个包

D:\Soft\jar\dom4j-1.6.1.jar
D:\Soft\jar\jaxen.jar

//开始

package com.itheima.xml;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class TextDom4jParseXML {

	/**
	 * @param args
	 * @throws DocumentException 
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException, DocumentException {
		String filename="F:/test.xml"; //不存在的文件
		System.out.println("============1.创建文档");
		if (createXMLFile(filename)==1)
			System.out.println("创建XML文档成功!");
		else
			System.out.println("创建XML文件失败!");

		System.out.println("=============2.读取XML文件,将文档内容输出到控制台");
		read(getDocument(filename));
		System.out.println();
		System.out.println("=============3.修改XML文档内容,输出修改后的文档内容");
		update(filename, "songshu", "liushu");
		toControl(filename, getDocument(filename)); //输出修改后的文档,然后保存修改后的文档
		System.out.println("============4.删除编号为002的节点,输出删除后的文件");
		delete(filename, "002");
		toControl(filename, getDocument(filename));
		System.out.println("============5.输出节点(/trees/tree)");
		print(filename);
		System.out.println("============6.格式化文件解决中文问题");
		if(formatXML(filename, "GBk")==1){
			System.out.println("格式化文档成功!");
		}else
			System.out.println("格式化失败!");
		

	}
	
	//手动创建一个XML文件 输出到制定的文件下 
	public static int createXMLFile(String filename){
		int returnVale=0; //返回操作的结果 0 表示失败, 1表示成功
		//创建XML文件
		Document document=DocumentHelper.createDocument();
		//创建根节点
		Element treesElement=document.addElement("trees");
		treesElement.addComment("This is a test for dom4j"); //加入一行注释
		
		//加入 第一个tree节点
		Element treeElement=treesElement.addElement("tree");
		treeElement.addAttribute("id","001"); //添加id属性内容
		treeElement.addAttribute("name", "rongshu");  //添加 name属性内容
		
		Element descElement=treeElement.addElement("description");
		descElement.setText("It is a big tree");  //为 descriiption 设置内容
		
		//添加第二个节点
		treeElement=treesElement.addElement("tree");
		treeElement.addAttribute("id", "002");
		treeElement.addAttribute("name", "yangshu");
		
		descElement=treeElement.addElement("description");
		descElement.setText("The tree grows taller form day to day");
		
		//添加第三个节点
		treeElement=treesElement.addElement("tree");
		treeElement.addAttribute("id", "003");
		treeElement.addAttribute("name", "songshu");
		descElement=treeElement.addElement("description");
		descElement.setText("The tree is very beautiful");
		
		Element ownerElement=treesElement.addElement("flower");
		ownerElement.setText("rose");
		try {
			//创建XML文件对象
			XMLWriter writer=new XMLWriter(new FileWriter(new File(filename)));
			
			writer.write(document);
			writer.close();
			returnVale=1;
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
		return returnVale;
	}
	
	public static void read(Document document) throws IOException{
		XMLWriter writer=new XMLWriter(new FileWriter("F:/output.xml"));
		writer.write(document);
		writer.close();
		//将文件内容缩进方式输出到控制台
		OutputFormat format=OutputFormat.createPrettyPrint();
		writer=new XMLWriter(System.out, format);
		writer.write(document);
		//讲文件内容紧凑的输出到控制台
		format=OutputFormat.createCompactFormat();
		writer =new XMLWriter(System.out, format);
		writer.write(document);
	}
	
	//读取文件获取document
	public static Document getDocument(String filename) throws DocumentException{
		SAXReader saxReader=new SAXReader();
		Document document=saxReader.read(new File(filename));
		return document;
	}
	
	//删除 XML文件中指定的id节点
	public static boolean delete(String filename,String id) throws DocumentException{
		boolean returnValue=false;
		Document document=getDocument(filename); //调用方法获取document
		Element root=document.getRootElement();  //获得根节点
		List list=document.selectNodes("/trees/tree/@id"); //获取编号的列表 
		Iterator iter=list.iterator();
		while (iter.hasNext()) {
			Attribute attribute=(Attribute)iter.next();
			if(attribute.getValue().equals(id)){
				Element element=attribute.getParent();
				root.remove(element);
			}
		}
		try {
			XMLWriter writer=new XMLWriter(new FileOutputStream(new File(filename)));
			writer.write(document);
			writer.close();
			returnValue=true;
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
			return returnValue;
		}
		return returnValue;
		
	}
	
	//修改xml文件中的指定的节点内容 ,并且 添加内容
	public static int update(String filename,String oldName,String newName){
		int returnValue=0;
		try {
			Document document=getDocument(filename);
			List list=document.selectNodes("/trees/tree/@name");
			Iterator iter=list.iterator();
			while (iter.hasNext()) {
				Attribute attribute = (Attribute)iter.next();
				if(attribute.getValue().equals(oldName)){
					attribute.setValue(newName);
				}
			}
			
			list=document.selectNodes("/trees/flower");
			iter=list.iterator();
			if(iter.hasNext()){
				Element flower=(Element)iter.next();
				flower.setText("lily");
				Element date=flower.addElement("date");
				date.setText("2009-04-10");
				date.addAttribute("type", "calendar");
			}
			try {
				XMLWriter writer=new XMLWriter(new FileWriter(new File(filename)));
				writer.write(document);
				writer.close();
				returnValue=1;
			} catch (Exception e) {
				// TODO: handle exception
				System.out.println("修改XML文件出错:"+e.getMessage());
				returnValue=0;
			}
			
		} catch (Exception e) {
			System.out.println("修改XML文件出错:"+e.getMessage());
			returnValue=0;
		}
		return returnValue;
	}
	
	//格式化XML文档并且解决中文乱码
	public static int formatXML(String filename,String encoding){
		int returnValue=0;
		try {
			Document document=getDocument(filename);
			XMLWriter writer=null;
			
			//格式化输出,类型和ID浏览一样
			OutputFormat format=OutputFormat.createPrettyPrint();
			format.setEncoding(encoding); //指定XML的编码方式
			writer=new XMLWriter(new FileWriter(new File(filename)),format);
			writer.write(document);
			writer.close();
			returnValue=1;
			
		} catch (Exception e) {
			System.out.println("格式化XML文档出错:"+e.getMessage());
			returnValue=0;
		}
		return returnValue;
	}
	
	
	public static void toControl(String filename,Document document){
		try {
			XMLWriter writer=new XMLWriter(new FileWriter(filename));
			writer.write(document); //将文档内容输出到文件
			writer.close();
			//将文档内容格式化输出到控制台
			OutputFormat format=OutputFormat.createPrettyPrint();
			writer=new XMLWriter(System.out,format);
			writer.write(document);
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println("输出出错:"+e.getMessage());
		}
	}
	//将xml转化成String
	public static String XmlToString(Document document){
		return document.asXML();
	}
	
	//将String 转换成 document
	public static Document StrintToDocument(String text){
		try {
			return DocumentHelper.parseText(text);
		} catch (Exception e) {
			System.out.println("转换出错:"+e.getMessage());
			return null;
		}
	}
	//输出节点
	public static void print(String filename){
		try {
			Document doc=getDocument(filename);
			Node node=doc.selectSingleNode("/trees/tree");
			System.out.println("输出节点:"+node.asXML()); //将节点转化成String
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println("输出节点出错:"+e.getMessage());
		}
	}

}