import java.io.*;

/**

 * @Description:

 * @projectName:JavaTest

 * @see:PACKAGE_NAME

 * @author:郑晓龙

 * @createTime：2019/5/3 0:45

 * @version：1.0

 */

public class CopyWithBytes {

    public static void main(String[] args) {

        byte[] bytes = readFileToByteArray("d:/abc.txt");

        writeByteArrayToFile(bytes,"d:/23123.txt");

    }

    public static byte[] readFileToByteArray(String src) {

        // 文件输入流（需要关闭）

        InputStream is = null;

        try {

            is = new FileInputStream(new File(src));

            // 字节数组输出流（不需要关闭）

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buf = new byte[1024 * 1];

            int len;

            while ((len = is.read(buf)) != -1) {

                baos.write(buf, 0, len);

            }

            baos.flush();

            return baos.toByteArray();

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            if (is != null) {

                try {

                    is.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }

        return null;

    }

    public static void writeByteArrayToFile(byte[] datas, String destFileName) {

        // 文件输出流（需要关闭）

        OutputStream os = null;

        try {

            // 字节数组输入流（不需要关闭）

            InputStream is = new ByteArrayInputStream(datas);

            os = new FileOutputStream(new File(destFileName));

            byte[] buf = new byte[1024];

            int len;

            while (((len = is.read(buf)) != -1)) {

                os.write(buf, 0, len);

            }

            os.flush();

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            if (os != null){

                try {

                    os.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }

    }

}