https://www.heckjj.com/index.php zh-cn https://www.heckjj.com/post// Heck <@hecks.tk> Wed, 30 Nov 2022 14:28:11 +0000 https://www.heckjj.com/post//
解决方式：

1. 必须使用相对路径读取文件；

假设你的模板文件放在了 resources —> templates —> test.xlsx

2. 只能使用流去读取，不能用file;

  // jar里面文件读取方式：
  ClassPathResource classPathResource = new ClassPathResource("templates/test.xlsx");
  // 获取文件流
  classPathResource .getInputStream();

如果要将流存储到数组中如下：

  /**
     * 输出流转字节数组
     * @param input 输出流
     * @return 字节数组
     */
    public static byte[] toByteArray(InputStream input) throws IOException {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024 * 4];
        int size = 0;
        while (-1 != (size = input.read(buffer))) {
            output.write(buffer, 0, size);
        }
        return output.toByteArray();
    }
]]> https://www.heckjj.com/post//#blogcomment <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 https://www.heckjj.com/post//#blogcomment