运行java代码后，hr.xml文件中没有新写入的内容

老师运行的hrwriter后，也没有任何错误提示，但是hr.xml里面也没有新的数据，核对了代码，也没有找到问题，请老师给看下问题在哪里

在这

package com.imooc.dom4j;

import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;

import org.dom4j.Document;
//import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class HrWriter {
	public void writeXml() {
		String file = "G:/123456/xml/src/hr.xml";
		// SAXReader类是读取xml文件的核心类，用于将xml解析后以“树”的形式保存在内存中。
		SAXReader reader = new SAXReader();
		try {
			Document document = reader.read(file);
			// 获取xml文档的根节点，即hr标签
			Element root = document.getRootElement();
			Element employee = root.addElement("employee");
			employee.addAttribute("no", "0003");
			Element name = employee.addElement("name");
			name.setText("李铁柱");
			employee.addElement("age").setText("45");
			employee.addElement("salary").setText("3600");
			Element department = employee.addElement("department");
			department.addElement("dname").setText("人事部");
			department.addElement("address").setText("中南海");
			Writer writer = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
			document.write(writer);
			writer.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		HrWriter hrWriter = new HrWriter();
		hrWriter.writeXml();
	}
}
​
package com.imooc.dom4j;

import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class HrReader {
	public void readXml() {
		String file = "G:/123456/xml/src/hr.xml";
		// SAXReader类是读取xml文件的核心类，用于将xml解析后以“树”的形式保存在内存中。
		SAXReader reader = new SAXReader();
		try {
			Document document = reader.read(file);
			// 获取xml文档的根节点，即hr标签
			Element root = document.getRootElement();
			// 用于获取指定的标签集合
			List<Element> employees = root.elements("employee");
			for (Element employee : employees) {
				// element方法用于获取唯一的子节点对象
				Element name = employee.element("name");
				// getText()方法用于获取标签文本
				String empName = name.getText();
				System.out.println(empName);
				System.out.println(employee.elementText("age"));
				System.out.println(employee.elementText("salary"));
				Element department = employee.element("department");
				System.out.println(department.elementText("dname"));
				System.out.println(department.elementText("address"));
				Attribute att = employee.attribute("no");
				System.out.println(att.getText());
			}
		} catch (DocumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		HrReader reader = new HrReader();
		reader.readXml();
	}
}​
​
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hr SYSTEM "hr.dtd">
<!-- 人力资源 -->
<hr>
	<employee no="0001">
		<name>张三</name>
		<age>31</age>
		<salary>4500</salary>
		<department>
			<dname>会计部</dname>
			<address>高新56号</address>
		</department>
	</employee>

	<employee no="0002">
		<name>李四</name>
		<age>35</age>
		<salary>5500</salary>
		<department>
			<dname>体育部</dname>
			<address>高新56号</address>
		</department>
	</employee>
</hr>

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