java读取文件目录结构并生成xml树

java读取文件目录结构并生成xml树,具体实现代码如下：
package org.wendong.file;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.Writer;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
/**
* 多线程读取本地文件中的所有文件目录结构及文件大小
* @author Administrator
*
*/
public class ThreadReader extends Thread {
@Override
public void run() {
try {
Long start = System.currentTimeMillis();
String name = Thread.currentThread().getName();
System.err.println("当前线程名:"+name);
File file = new File(name);
Document doc = DocumentHelper.createDocument();
Element el = doc.addElement(file.getName());
el = getFile(file, el);
File docFile = new File(name+"/目录结构.xml");
if(!docFile.exists()){
docFile.createNewFile();
FileOutputStream fos = new FileOutputStream(docFile);
fos.write(doc.asXML().getBytes());
fos.flush();
fos.close();
}
Long end = System.currentTimeMillis();
System.out.println("目录建立成功! 耗时:"+(end - start)+"ms");
} catch (Exception e) {
System.err.println("异常"+e);
}
}
public static Element getFile(File file, Element el){
try {
File[] list = file.listFiles();
if(list != null && list.length > 0){
for(File f : list){
if(f.isDirectory()){//目录
Element e = el.addElement("Folder");
e.addAttribute("name",
f.getName());
e.addAttribute("lastModify", parseDate(
stModified()));
getFile(f, e);
}else{//文件
Element e = el.addElement("File");
e.addAttribute("name",
f.getName());
e.addAttribute("lastModify", parseDate(
stModified()));
e.addAttribute("size", parseSize(
f.length()));
}
System.out.println(el.asXML());
}
}
return el;
} catch (Exception e) {
System.err.println("异常"+e);
}
return null;
}
public static String parseSize(Long l){
String strSize = "0";
if(l < 1000){
strSize = l + "B";
}else if(l < 1000*1000){
strSize = l/1000+"."+l%1000+"K";
}else if(l < 1000*1000*1000){
strSize = l/(1000*1000)+"."+l%(1000*1000)+"M";
}else if(l < 1000*1000*1000*1000){
strSize = l/(1000*1000*1000)+"."+l%(1000*1000*1000)+"G";
}
return strSize;
}
public static String parseDate(Long l){
Calendar calendar = GregorianCalendar.getInstance();
calendar.setTimeInMillis(l);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
return sdf.format(calendar.getTime());
}
public static void main(String[] args) {
try {
File[] file = File.listRoots();
for(File f : file){
ThreadReader tr = new ThreadReader();
tr.setName(f.getName());
tr.setPriority(MAX_PRIORITY);
tr.start();
}
} catch (Exception e) {
System.err.println("异常"+e);
}
}
}。