Dom4j读取xml

使用很简单，所以直接上代码

依赖：

  <!-- https://mvnrepository.com/artifact/dom4j/dom4j -->
	<dependency>
	    <groupId>dom4j</groupId>
	    <artifactId>dom4j</artifactId>
	    <version>1.6.1</version>
	</dependency>

工具类：

package com.xx.dao;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.List;

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

import com.xx.controller.Hello;
/*
 *xml读取写入工具类 
 */
public class XmlReadWriteUtil {
	//创建或获取文件对象
	//public static String filePath=null;
	public static File file = null;
	static {
		String path=getPath();
		file = new File(path);
     	if(!file.exists()){
     		try {
 				file.createNewFile();
 		     	PrintWriter out = new PrintWriter(new BufferedWriter(
 		                new FileWriter(file, true)));
 		     	out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); 
 		     	out.println("<users>");
 		     	out.println("</users>");
 		     	if (out != null) {
 		            out.close();
 		        }
 				
 			} catch (IOException e) {
 				e.printStackTrace();
 			}
     	}
     	
	}
	public static String getPath() {
		String project_root=XmlReadWriteUtil.class.getResource("/").toString().replace("file:/", ""); 
		project_root = project_root.substring(0,project_root.indexOf("/WEB-INF"))+"/user.xml"; 
		System.out.println(project_root);
		return project_root;
	}
	
	
	
	/**
	 * 获取根节点
	 * @return
	 * @throws Exception
	 */
	public static Document getDocument() throws Exception {  

        // 创建saxReader对象  
        SAXReader reader = new SAXReader();  
        // 通过read方法读取一个文件 转换成Document对象  
        Document document = reader.read(file);  
        
        return document ;
    }
	/**
	 * 读取数据
	 * @throws Exception
	 */
	public static void readXML() throws Exception {  

        
		Document document = getDocument();
      //获取根节点元素对象  
        Element root = document.getRootElement();  
        //获取根元素下所有节点
	    List<org.dom4j.Element> list = root.elements();
	    for(org.dom4j.Element e:list){
	       //获取属性值
	        String no   = e.attributeValue("no");
	        String name = e.element("name").getText();
	        String age  = e.element("age").getText();
	        System.out.println(no+name+age);
	    }

    } 
	 
	public static void createNewNode(){
		
		 Document document;
		try {
			document = getDocument();
			 Element root = document.getRootElement();  
	         Element supercarElement= root.addElement("user").addAttribute("id", "2019");;
	         Element name = supercarElement.addElement("name");
	         name.addText("jack");
	         Element age= supercarElement.addElement("age");
	         age.addText("18");
	         writer(document);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
         
	}
	  /** 
     * 把document对象写入新的文件 
     *  
     * @param document 
     * @throws Exception 
     */  
    public static void writer(Document document) throws Exception {  
        // 紧凑的格式  
        // OutputFormat format = OutputFormat.createCompactFormat();  
        // 排版缩进的格式  
        OutputFormat format = OutputFormat.createPrettyPrint();  
        // 设置编码  
        //format.setEncoding("UTF-8");  
        // 创建XMLWriter对象,指定了写出文件及编码格式  
        // XMLWriter writer = new XMLWriter(new FileWriter(new  
        // File("src//a.xml")),format);  
        XMLWriter writer = new XMLWriter(new OutputStreamWriter(  
                new FileOutputStream(file), "UTF-8"), format);  
        // 写入  
        writer.write(document);  
        // 立即写入  
        writer.flush();  
        // 关闭操作  
        writer.close();  
    }  
	
	
	
	
}