Java实现文件拷贝（包括文件夹下的子文件夹和其中的文件）

import java.io.*;

public class CopyAll {

 public void copyDir(File from, File to) {
  if (!to.exists()) {
   to.mkdirs();
  }
  File[] files = from.listFiles();
  for (int i = 0; i < files.length; i++) {
   File file1 = files[i];
   File file2 = new File(to.getPath() + File.separator
     + files[i].getName());
   if (!file1.isDirectory()) {
    copyFile(file1, file2);
   } else {
    copyDir(file1, file2);
   }
  }

 }

 public void copyFile(File src, File dest) {
  try {
   System.out.println(src.getAbsoluteFile() + " -> "
     + dest.getAbsoluteFile());
   FileInputStream in = new FileInputStream(src);
   FileOutputStream out = new FileOutputStream(dest);
   byte[] buffer = new byte[1024];
   while (in.read(buffer) != -1) {
    out.write(buffer);
   }
   out.close();
   in.close();
   System.out.println("文件拷贝成功");
  } catch (Exception e) {
   System.out.println("文件拷贝失败");
  }

 }

 public static void main(String[] args) {
  CopyAll t = new CopyAll();
  t.copyDir(new File(args[0]), new File(args[1]));

 }

}