写XML文件

package com.itheima.util;
//工具类可以抛,也可以处理.
public class Dom4jUtil {
    //获取Document
    public static Document getDocument() throws Exception {
        SAXReader reader = new SAXReader();
        Document document = reader.read("src/exam.xml");
        return document;
    }
    //把数据写入XML中去
    public static void write2xml(Document document) throws Exception{
        OutputFormat format = OutputFormat.createPrettyPrint();//漂亮的格式,默认
        format.setEncoding("UTF-8");//设置编码,默认UTF-8
        XMLWriter writer = new XMLWriter(new FileOutputStream("src/exam.xml"),format);
        writer.write(document);
        writer.close();
    }
}