没有使用jar包的XML增加操作 - Java / 非技术区

Java code:

package com.huawei.lzw.test;

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class NotJarDocument
{
private Document getW3cDomcument() throws Exception {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.newDocument();
return document;
}

public Document getWriteDocument() throws Exception{
Document document = this.getW3cDomcument();
Element rootElmt = document.createElement("Root");

Comment comment = document.createComment("这是注释");
rootElmt.appendChild(comment);

Element node1Elment = document.createElement("Node1");
node1Elment.appen