以前写的一个文件夹遍历代码

很久前写的了，用于查看文件夹下的所有文件大小和路径，一般是在传递给别人一个打包文件的时候生成结构目录用的。

生成的是一个xml文件。

 

其实说白了就是一个深度优先的回溯遍历过程。

代码如下：

 

traverse类：

 

package Folders;import java.io.File;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.Element;public class traverse {private static WriteDao FolderDao;public static void main(String args[]){traverse.init("out.xml",System.getProperty("user.dir"));}public static void init(String outputFileName,String strPath){try {FolderDao=new WriteDao(outputFileName);File dir = new File(strPath);Element node = FolderDao.initXML("Dir");getFileNames(node,dir);FolderDao.toSave();} catch (ParserConfigurationException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/*public static void getFileNames(Element node, File dir){FolderDao.WriteTextNode(node,"dir", dir.getName()+" # "+dir.length());File[] files = dir.listFiles();if(files.length>0){Element newNode = FolderDao.WriteNode(node,"dir");for(File file : files){if(file.isDirectory()){getFileNames(newNode,file);}else{FolderDao.WriteTextNode(newNode,"file", file.getName()+" # "+file.length());}}}}*/public static long getFileNames(Element node, File dir){//System.out.println(dir.getName());Element dirNode = FolderDao.WriteNode(node,"Dir");String name;if((name=dir.getName()).equals("")){//针对根目录做出的处理name = dir.toString();}FolderDao.AddAttribute(dirNode, "Name", name);File[] files = dir.listFiles();if(files == null){System.out.println(dir.toString()+"'s fileslist is NULL");FolderDao.AddAttribute(dirNode, "Size", size(0));return 0;}long length = 0;if(files.length>0){for(File file : files){//System.out.println(" "+file.toString());if(file.isDirectory()){length += getFileNames(dirNode,file);}else{Element FileNode = FolderDao.WriteNode(dirNode,"File");FolderDao.AddAttribute(FileNode, "Name", file.getName());FolderDao.AddAttribute(FileNode, "Size", size(file.length()));length += file.length();}}}FolderDao.AddAttribute(dirNode, "Size", size(length));return length;}private static String size(long x){int precision = 7;if ( x < 1000<<10 ){return String.valueOf( ((x>>precision)<<precision)/1024.0)+"KB";}else if ( x< 1000<<20 ){return String.valueOf( ((x>>(10+precision))<<precision)/1024.0 )+"MB";}else{return String.valueOf( ((x>>(20+precision))<<precision)/1024.0 )+"GB";}}}

 

WriteDao类，用于生成xml。

package Folders;import java.io.FileOutputStream;import java.io.OutputStreamWriter;import java.io.PrintWriter;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.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Document;import org.w3c.dom.Element;public class WriteDao {private Document document; private String filename;public WriteDao(String name) throws ParserConfigurationException{ filename=name;DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance(); DocumentBuilder builder=factory.newDocumentBuilder(); document=builder.newDocument(); }public Element initXML(String Ele){Element root=document.createElement(Ele);document.appendChild(root);return root;}public Element WriteNode(Element node, String ClassName){Element element=document.createElement(ClassName);node.appendChild(element);return element;}public Element WriteTextNode(Element node,String ContentName,String mycontent){Element element=document.createElement(ContentName);element.appendChild(document.createTextNode(mycontent)); node.appendChild(element);return element;}public void AddAttribute(Element element,String Attribute,String Argu){element.setAttribute(Attribute,Argu);}public void toSave(){try{ TransformerFactory tf=TransformerFactory.newInstance();Transformer transformer=tf.newTransformer(); DOMSource source=new DOMSource(document); transformer.setOutputProperty(OutputKeys.ENCODING,"UTF8"); transformer.setOutputProperty(OutputKeys.INDENT,"yes");PrintWriter pw=new PrintWriter(new OutputStreamWriter(new FileOutputStream(filename), "UTF8")); StreamResult result=new StreamResult(pw); transformer.transform(source,result); }catch(Exception e){e.printStackTrace();}}}