Java 遍历文件夹下的所有文件和文件夹

import java.io.File;
import java.io.IOException;
public class FileDemo01 {
 /**
  * @param args
  * @throws IOException
  */
 public static void main(String[] args)  {
  File file = new File("F:" +File.separator+"webroot"+File.separator);
  File files[] = file.listFiles();
  OutFiles(files);
 }
 private static void OutFiles(File[] files)  {
  for (int a = 0; a < files.length; a++) {
   if (files[a].isDirectory()&&files[a].canRead()) {
    System.out.println(files[a].getAbsolutePath());
    File file1 = new File(files[a].getAbsolutePath()+File.separator);
    File files1[] = file1.listFiles();
    if (files1.length > 0)
     OutFiles(files1);
    else{
        continue; 
    }
   } else {
    System.out.println(files[a]);
   }
  }
 }
}