MultipartFile怎么组装

MultipartFile是Spring[框架](https://geek.csdn.net/educolumn/22a7e35d15188291988ee30b364c422e?spm=1055.2569.3001.10083)中的一个接口，用于处理文件上传。在实际应用中，我们可以使用CommonsMultipartFile或MockMultipartFile来实现MultipartFile接口。下面是一个使用CommonsMultipartFile组装MultipartFile的例子： ```java import [org](https://geek.csdn.net/educolumn/23d0bba68b71e0503af30ae29797603f?spm=1055.2569.3001.10083).springframework.web.multipart.commons.CommonsMultipartFile; import java.io.File; import java.io.FileInputStream; import java.io.IOException; public class MultipartFileDemo { public st[ati](https://geek.csdn.net/educolumn/150d7073277950db5f09620704e791cf?spm=1055.2569.3001.10083)c void main([string](https://geek.csdn.net/edu/8802d631b97a4a6af1f4d0bbf8527465?dp_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6NDQ0MDg2MiwiZXhwIjoxNzA3MzcxOTM4LCJpYXQiOjE3MDY3NjcxMzgsInVzZXJuYW1lIjoid2VpeGluXzY4NjQ1NjQ1In0.RrTYEnMNYPC7AQdoij4SBb0kKEgHoyvF-bZOG2eGQvc&spm=1055.2569.3001.10083)[] args) throws IOException { // 读取文件 File file = new File("test.txt"); FileInputStream input = new FileInputStream(file); // 构造CommonsMultipartFile[对象](https://geek.csdn.net/educolumn/04c51611e4b730957464192e0307b82c?spm=1055.2569.3001.10083) CommonsMultipartFile multipartFile = new CommonsMultipartFile(fileItem); // 关闭文件流 input.close(); ``