把文件转换成流【常用文件存数据库操作】

矫情吗；* 2022-12-14 15:58 139阅读 0赞

文件转流

public static byte[] file2byte(String filePath) {
            byte[] buffer = null;
            try {
                File file = new File(filePath);
                FileInputStream fis = new FileInputStream(file);
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                byte[] b = new byte[1024];
                int n;
                while ((n = fis.read(b)) != -1) {
                    bos.write(b, 0, n);
                }
                fis.close();
                bos.close();
                buffer = bos.toByteArray();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return buffer;
        }

流转文件

public void byte2File(byte[] buf, String filePath, String fileName) {
            BufferedOutputStream bos = null;
            FileOutputStream fos = null;
            File file = null;
            try {
                File dir = new File(filePath);
                if (!dir.exists() && dir.isDirectory()) {
                    dir.mkdirs();
                }
                file = new File(filePath + File.separator + fileName);
                fos = new FileOutputStream(file);
                bos = new BufferedOutputStream(fos);
                bos.write(buf);
            } 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();
                    }
                }
            }
        }