xml解析中，通常大家读文件，解析的时候没有问题，但是在写文件的时候常常会碰到乱码等问题，就我的个人体会是一般只要在写文件的时候采用文件流的形式，设置好当前的编码方式，通常就会避免此类问题的发生！下面有两个简单的分别是采用jdom和dom4j实现的例子：

1、dom4j

package org.lyj.xml;

import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import org.dom4j.Document;
import org.dom4j.Element;
import java.io.FileWriter;
import org.dom4j.io.OutputFormat;
import org.dom4j.Namespace;
import org.dom4j.io.XMLWriter;
import java.io.File;
import java.io.IOException;
import org.dom4j.DocumentHelper;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class Dom4jTest {
public void generateDocument() {
  org.dom4j.DocumentFactory df = new org.dom4j.DocumentFactory();
  Document document = df.createDocument();//.createDocument();
  Element catalogElement = document.addElement("catalog");
  catalogElement.addComment("An XML Catalog");
  catalogElement.addProcessingInstruction("target", "text");
  Element journalElement = catalogElement.addElement("journal");
  journalElement.addAttribute("title", "XML Zone");
  journalElement.addAttribute("publisher", "IBM developerWorks");

Element articleElement = journalElement.addElement("article");
  articleElement.addAttribute("level", "Intermediate");
  articleElement.addAttribute("date", "December-2001");
  Element titleElement = articleElement.addElement("title");
  titleElement.setText("Java configuration with XML Schema");
  Element authorElement = articleElement.addElement("author");
  Element firstNameElement = authorElement.addElement("录音机");
  firstNameElement.setText("Marcello");
  Element lastNameElement = authorElement.addElement("刘");
  lastNameElement.setText("Vitaletti");

document.addDocType("catalog",
null, "file://c:/Dtds/catalog.dtd");
  document.setXMLEncoding("gb2312");

try {
   OutputFormat of = OutputFormat.createCompactFormat();
   of.setEncoding("gb2312");
   XMLWriter output = new XMLWriter(
  new java.io.FileOutputStream(new File("c:/catalog/catalog.xml")),of);
   output.write(document);
   output.close();
  } catch (IOException e) {
   System.out.println(e.getMessage());
  }
}

public static void main(String[] argv) {
  Dom4jTest dom4j = new Dom4jTest();
  dom4j.generateDocument();
}
}

2、jdom

package org.lyj.xml;

import org.jdom.output.Format;
import org.jdom.Document;
import java.io.IOException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
import org.jdom.JDOMException;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class JdomWriter {
public JdomWriter() {
}

public void write(){
  try {
   SAXBuilder builder = new SAXBuilder();
   Document doc = builder.build("aa.xml");
   XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat().setEncoding("utf-8"));
   outputter.output(doc, new java.io.FileOutputStream("bb.xml"));
  } catch (JDOMException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }

}
public static void main(String args[]){
  JdomWriter jd = new JdomWriter();
  jd.write();
}
}