自己写的一个XML文档类

package edu.basejava.util;

public class XmlDoc
{

 private Instruction declare;

 private Element root;

 private static final String VERSION = "version";

 private static final String ENCODING = "encoding";

 private String version = "1.0";

 private String encoding = "utf-8";

 public XmlDoc()
 {
  this.init(null);
 }

 public XmlDoc(Element root)
 {
  this.init(root);
 }
 public void save(XmlDoc xd,String file) {
  CharFileIO.writeTxtFile(xd.toString(),file,this.getEncoding());
 }

 public String getEncoding()
 {
  return encoding;
 }

 public void setEncoding(String encoding)
 {
  this.encoding = encoding;
 }

 public Element getRoot()
 {
  return root;
 }

 public void setRoot(Element root)
 {
  this.root = root;
 }

 public String getVersion()
 {
  return version;
 }

 public void setVersion(String version)
 {
  this.version = version;
 }

 private void init(Element root)
 {
  declare = new Instruction("xml", new Attribute(VERSION, version),
    new Attribute(ENCODING, encoding));
  if (root == null)
   this.root = new Element("root");
  else
   this.root = root;
 }

 public String toString()
 {
  return (this.declare.toString() + this.root.toString());
 }
}