如何在弹簧控制器中使用multipartfile？

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.4</version>
</dependency>

@PostMapping("/upload")
public String uploadFile(@RequestParam("file") MultipartFile file) {
    // 处理文件上传逻辑
    return "File uploaded successfully!";
}

@PostMapping("/upload")
public String uploadFile(@RequestParam("file") MultipartFile file) {
    if (!file.isEmpty()) {
        String fileName = file.getOriginalFilename();
        String contentType = file.getContentType();
        long size = file.getSize();
        
        // 可以将文件保存到本地或者进行其他处理
        // file.transferTo(new File("path/to/save/" + fileName));
        
        return "File uploaded successfully!";
    } else {
        return "No file uploaded!";
    }
}