项目resource中文件路径和jar包中文件路径的区别

打成jar包后，是一个整体的文件。

正常读取

 InputStream inputStream = new FileInputStream("src/main/resources/invoiceTemplate.xlsx");

jar包读取

 InputStream inputStream = this.getClass().getResourceAsStream("/invoiceTemplate.xlsx");

完整代码：

    @GetMapping("/invoiceTemplateDownload2")public void templateDownload2(HttpServletResponse response) throws IOException {response.setContentType("application/vnd.ms-excel");response.setCharacterEncoding("utf-8");String fileName = URLEncoder.encode("模板", "UTF-8").replaceAll("\\+", "%20");response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");InputStream inputStream = this.getClass().getResourceAsStream("/template.xlsx");byte[] byteArray = IoUtils.toByteArray(inputStream);inputStream.close();response.getOutputStream().write(byteArray);}

[Java基础] 深入jar包：从jar包中读取资源文件