FileChannel 高效拷贝

 public void fileChannelCopy(File srcfile, File destfile) {

        FileInputStream fis= null;

        FileOutputStream fos= null;

        FileChannel fcin = null;

        FileChannel fcout = null;

        try {

            fis = new FileInputStream(srcfile);

            fos = new FileOutputStream(destfile);

            fcin = fis.getChannel();//得到对应的文件通道

            fcout = fos.getChannel();//得到对应的文件通道

            fcin.transferTo(0, fcin.size(), fcout);//连接两个通道，并且从ifcn通道读取，然后写入fcout通道

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            try {

                fis.close();

                fcin.close();

                fos.close();

                fcout.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

    }