将一个文件保存在另一个路径下，并重命名

import java.io.*;
import java.util.Date;

public class BackTest {
    static int BUFFER_SIZE = 1024;
    public static void main(String[] args) {
        int len=0;
        String fileName = "E:\\a.txt";
        String path = "E:\\a"; 
        System.out.println("保存图像方法");
        String latterpart= fileName.substring(fileName.lastIndexOf( "." ));
        String imagePath=path+"\\"+new Date().getTime()+latterpart;
        System.out.println("保存好的图像的路径为"+imagePath);
        
        String imageName=imagePath.substring(imagePath.lastIndexOf( "\\" )+1);
        File myFile = new File("E:\\a.txt");
        FileOutputStream fos;
        try {
            fos = new FileOutputStream(imagePath);
            FileInputStream fis=new FileInputStream(myFile);
            byte[] buffer=new byte[BUFFER_SIZE];
            while((len=fis.read(buffer))>0){
                fos.write(buffer,0,len);
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}

写的挺乱的，先粘贴上，日后在修改一下。