缓冲流

BufferedInputStream
BufferedOutputStream

public void copyWithBufferedSteam(String srcPath,String destPath){
        System.out.println("buffered steam");

        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            File srcFile = new File(srcPath);
            File destFile = new File(destPath);

            FileInputStream fis = new FileInputStream(srcFile);
            FileOutputStream fos = new FileOutputStream(destFile);

            bis = new BufferedInputStream(fis);
            bos = new BufferedOutputStream(fos);

            byte[] buffer = new byte[8192];
            int len;
            while ((len = bis.read(buffer)) != -1){
                bos.write(buffer,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bis != null){
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (bos != null){
                try {
                    bos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }