java文件拷贝

import java.io.*;

public class jcopy {
   public static void main(String args[]){
     try {

    jcopy j = new jcopy();
    j.CopyFile(new File("e:/file1.txt"),new File("e:/a.txt"));
       }
     catch (Exception e) {
       e.printStackTrace();
       }
     }

   public void CopyFile(File in, File out) throws Exception {
     FileInputStream fis  = new FileInputStream(in);
     FileOutputStream fos = new FileOutputStream(out);
     byte[] buf = new byte[1024];
     int i = 0;
     while((i=fis.read(buf))!=-1) {
       fos.write(buf, 0, i);
       }
     fis.close();
     fos.close();
     }
   }