Java 文件复制 效率

package web.action;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class FileUtil {
    public static void main(String[] args) {
        String oldPath = "E:/咱们结婚吧.mp4";
        String newPath = "E:/test/咱们结婚吧.mp4";
        FileUtil test1 = new FileUtil();
        test1.copyFile2(oldPath, newPath);
        
    }
    
    /**
     * 复制单个文件   40327
     * @param oldPath String 原文件路径 如：c:/fqf.txt
     * @param newPath String 复制后路径 如：f:/fqf.txt
     * @return boolean
     */
   public void copyFile(String oldPath, String newPath) {
       try {
           int bytesum = 0;
           int byteread = 0;
           File oldfile = new File(oldPath);
           long begin = System.currentTimeMillis();
           if (oldfile.exists()) { //文件存在时
               InputStream inStream = new FileInputStream(oldPath); //读入原文件
               FileOutputStream fs = new FileOutputStream(newPath);
               byte[] buffer = new byte[1444];
               int length;
               while ( (byteread = inStream.read(buffer)) != -1) {
                   bytesum += byteread; //字节数 文件大小
                   System.out.println(bytesum);
                   fs.write(buffer, 0, byteread);
               }
               inStream.close();
               long end = System.currentTimeMillis();
               System.out.println("总共耗时:"+ (end - begin));
           }
       }
       catch (Exception e) {
           System.out.println("复制单个文件操作出错");
           e.printStackTrace();

       }

   }
    // 利用缓冲流 复制文件  总共耗时:34244
    public void copyFile2(String oldPath, String newPath) {  
        
        
        InputStream in = null;  
        OutputStream out = null;  
        long begin = System.currentTimeMillis();
        try {  
            in = new BufferedInputStream(new FileInputStream(new File(oldPath)), 1024);  
            out = new BufferedOutputStream(new FileOutputStream(new File(newPath)), 1024);  
            byte[] buffer = new byte[1024];  
            int len = 0;  
            while ((len = in.read(buffer)) > 0) {  
                out.write(buffer, 0, len);  
            }  
            long end = System.currentTimeMillis();
            System.out.println("总共耗时:"+ (end - begin));
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            if (null != in) {  
                try {  
                    in.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
            if (null != out) {  
                try {  
                    out.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
    }
   /**
     * 复制整个文件夹内容
     * @param oldPath String 原文件路径 如：c:/fqf
     * @param newPath String 复制后路径 如：f:/fqf/ff
     * @return boolean
     */
   public void copyFolder(String oldPath, String newPath) {

       try {
           (new File(newPath)).mkdirs(); //如果文件夹不存在 则建立新文件夹
           File a=new File(oldPath);
           String[] file=a.list();
           File temp=null;
           for (int i = 0; i < file.length; i++) {
               if(oldPath.endsWith(File.separator)){
                   temp=new File(oldPath+file[i]);
               }
               else{
                   temp=new File(oldPath+File.separator+file[i]);
               }

               if(temp.isFile()){
                   FileInputStream input = new FileInputStream(temp);
                   FileOutputStream output = new FileOutputStream(newPath + "/" +
                           (temp.getName()).toString());
                   byte[] b = new byte[1024 * 5];
                   int len;
                   while ( (len = input.read(b)) != -1) {
                       output.write(b, 0, len);
                   }
                   output.flush();
                   output.close();
                   input.close();
               }
               if(temp.isDirectory()){//如果是子文件夹
                   copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]);
               }
           }
       }
       catch (Exception e) {
           System.out.println("复制整个文件夹内容操作出错");
           e.printStackTrace();

       }

   }

}