java file 转 MultipartFile

你可以使用以下代码将Java文件转换为MultipartFile对象：

File pdfFile = new File("D://test.pdf");
FileInputStream fileInputStream = new FileInputStream(pdfFile);
MultipartFile multipartFile = new MockMultipartFile(pdfFile.getName(), pdfFile.getName(), ContentType.APPLICATION_OCTET_STREAM.toString(), fileInputStream);

这段代码将创建一个File对象，然后使用FileInputStream将文件读取为字节流。接下来，通过MockMultipartFile构造函数将字节流转换为MultipartFile对象。MockMultipartFile是Spring框架提供的一个用于模拟MultipartFile的类，它接受文件名、原始文件名、内容类型和文件输入流作为参数。<em>1</em><em>2</em><em>3</em>
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