输出流转输入流

依赖

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.3</version>
</dependency>

转换

OutputStream outputStream = new ByteArrayOutputStream();
template.write(outputStream);
//先把outputStream强转成ByteArrayOutputStream
ByteArrayOutputStream byteArrayOutputStream = (ByteArrayOutputStream) outputStream;
InputStream inputStream = streamTran(byteArrayOutputStream);
//inputStream转MultipartFile
MultipartFile multipartFile = getMultipartFile(inputStream, wrDhWarnPrompt.getTitle() + "_" + y + "_" + m + "_" + d + "_" + wrDhWarnPrompt.getWarnCd() + ".docx");

工具方法

private InputStream streamTran(ByteArrayOutputStream in) {
    return new ByteArrayInputStream(in.toByteArray());
}