CopyFile，复制一个文件的Java代码

 public void copy(String src,String dest){
  FileInputStream fis = null;
  FileOutputStream fos = null;
  try{
            byte bt[]=new byte[256];
            fis=new FileInputStream(src);
            fos=new FileOutputStream(dest);
            int size=0;
            while((size=fis.read(bt))!=-1){
                fos.write(bt,0,size);
            }

  }catch(Exception e){
   e.printStackTrace();
  }finally{
   try{
             if(null != fis) fis.close();
             if(null != fos) fos.close();
   }catch(Exception e){
    e.printStackTrace();
   }
  }
 }