需求：修改带有属性的xml  如需要修改下面title【一般不带有属性的修改方式比较容易，在此不演示】

  <book category="COOKING"> 
    <title lang="en">Everyday Italian</title>  
    <author>Giada De Laurentiis</author>  
    <year>2005</year>  
    <price>30.00</price> 
  </book>  

准备：

一、jar包，这两个jar包可以用maven的porm引用也可以直接去网上下载（链接：https://pan.baidu.com/s/1V2f-s3FnEkkvmy--eD3-cw提取码：hk26）。

dom4j-1.6.1.jar
jaxen-1.1-beta-8.jar

        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>jaxen</groupId>
            <artifactId>jaxen</artifactId>
            <version>1.1-beta-8</version>
        </dependency>

二、xml文件，这里使用xpah定位元素

<?xml version="1.0" encoding="UTF-8"?>

<bookstore> 
  <book category="COOKING"> 
    <title lang="en">Everyday Italian</title>  
    <author>Giada De Laurentiis</author>  
    <year>2005</year>  
    <price>30.00</price> 
  </book>  
  <book category="CHILDREN"> 
    <title lang="en">Harry Potter</title>  
    <author>J K. Rowling</author>  
    <year>2005</year>  
    <price>29.99</price> 
  </book>  
  <book category="WEB"> 
    <title lang="en">啦啦啦</title>  
    <author>James McGovern</author>  
    <author>Per Bothner</author>  
    <author>Kurt Cagle</author>  
    <author>James Linn</author>  
    <author>Vaidyanathan Nagarajan</author>  
    <year>2003</year>  
    <price>49.99</price> 
  </book>  
  <book category="WEB"> 
    <title lang="en">Learning XML</title>  
    <author>Erik T. Ray</author>  
    <year>2003</year>  
    <price>39.95</price> 
  </book> 
</bookstore>

三、代码

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class demos1 {
    public static void main(String[] args) {
        String filePath = "E:\\Temp\\dd.xml";
        String xpath = "//book[@category='WEB']/title[@lang='en']";//查询属性type='Creator'
        String values = "啦啦啦";
        updateXml(filePath, xpath, values);
    }

    public static String updateXml(String filePath, String xpath, String values) {
        try {
            //获取tomcat下文件的相对路径
            SAXReader reader = new SAXReader();
//            FileInputStream f = new FileInputStream(filePath);
            File file=new File(filePath);
            Document document = reader.read(file); //dom4j读取
            Element element = (Element) document.selectSingleNode(xpath);//得到name=Creator的元素
            element.setText(values);
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("UTF-8");
            XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);
            writer.write(document);
            writer.close();
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "OK!";
    }
}