java byte数组和文件互转

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public class FileBytetransfer {

        //将文件转换成Byte数组
        public static byte[] getBytesByFile(String pathStr) {
            File file = new File(pathStr);
            try {
                FileInputStream fis = new FileInputStream(file);
                ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
                byte[] b = new byte[1000];
                int n;
                while ((n = fis.read(b)) != -1) {
                    bos.write(b, 0, n);
                }
                fis.close();
                byte[] data = bos.toByteArray();
                bos.close();
                return data;
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        //将Byte数组转换成文件
        public static void getFileByBytes(byte[] bytes, String filePath, String fileName) {
            BufferedOutputStream bos = null;
            FileOutputStream fos = null;
            File file = null;
            try {
                File dir = new File(filePath);
                if (!dir.exists() && dir.isDirectory()) {// 判断文件目录是否存在
                    dir.mkdirs();
                }
                file = new File(filePath + "\" + fileName);
                fos = new FileOutputStream(file);
                bos = new BufferedOutputStream(fos);
                bos.write(bytes);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (bos != null) {
                    try {
                        bos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (fos != null) {
                    try {
                        fos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
}