java 生成xml文件

import java.awt.Image;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
public class createXml
{
public static boolean writeXml(String path,String dir,String wpath,String wname)
{
File[] files = ReaderListFiles(path);
boolean flag = false;
if(files!=null)
{
StringBuffer xml = ReaderFilesContent(files,dir);
if(xml!=null)
flag = writeXmlFile(wname,wpath,xml);
}

return flag;
}

private static File[] ReaderListFiles(String path)
{
File file = new File(path);
if(file.exists()&&file.isDirectory())
return file.listFiles();
else if(file.exists()&&file.isFile())
{
File[] files = new File[1];
files[0] = file;
return files;
}
else
return null;
}

private static StringBuffer ReaderFilesContent(File[] files,String dir)
{
StringBuffer txml = new StringBuffer();
for(int i=0;i<files.length;i++)
{
String filename = files[i].getName();
String temp = filename.substring(filename.lastIndexOf(".")+1);
if(temp!=null&&(temp.equals("gif")||temp.equals("jpg")||temp.equals("bmp")||temp.equals("jpeg")||temp.equals("png")))
txml.append(getImgDesc(filename,temp,dir,files[i]));
}
if(txml.length()>0)
{
StringBuffer xml = new StringBuffer("<?xml version='1.0' encoding='GBK'?>\r\n");
xml.append("<firstnode>\r\n");
xml.append(txml);
xml.append("</firstnode>");
return xml;
}
else
return null;
}

private static StringBuffer getImgDesc(String filename,String type,String dir,File file)
{
Image imgSrc;
StringBuffer xml = new StringBuffer();
try {
imgSrc = ImageIO.read(file);
int width = imgSrc.getWidth(null);
int height = imgSrc.getHeight(null);
xml.append("\t<secondnode id=\"").append(filename).append("\">\r\n");
xml.append("\t\t<name>").append(filename).append("</name>\r\n");