Java中文件的复制操作

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

public class CopyFile {
 public static void main(String[] args) {
  String str="c:/a.txt";
  String newPath="d:/a.txt/";
  File old=new File(str);
  copyFile(old,newPath);

 }
 private static void copyFile(File old, String newPath) {
  try {
   int bytesum = 0;
   int byteread = 0; 
   if (old.exists()) {// 如果文件存在
    InputStream inStream = new FileInputStream(old);// 读入源文件
    FileOutputStream fs = new FileOutputStream(newPath);
    byte[] buffer = new byte[1444];
    while ((byteread = inStream.read(buffer)) != -1) {
     bytesum += byteread;
     fs.write(buffer, 0, byteread);
    }
    inStream.close();
    fs.close();
   }
  } catch (Exception e) {
   System.out.println("复制文件操作出错");
   e.printStackTrace();
  }
 }
}