本地上传思路

引入Post请求注解，传参数，获取文件
获取文件名（主要是获取文件后缀）然后再用UUID类创建一个随机的名字

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newFileName + originalFilename.substring(originalFilename.lastIndexOf("."));

文件名加上获取的文件后缀
保存文件

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file.transferTo(new File("C:/Users/17433/Desktop/images/" + resFileName));

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import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
public class UploadController {

    @PostMapping("/upload")
    public Result upload(String name, String age, MultipartFile file) throws IOException {
        log.info("文件上传中...");
        String originalFilename = file.getOriginalFilename();
        
        String newFileName = UUID.randomUUID().toString();
        String resFileName = newFileName + originalFilename.substring(originalFilename.lastIndexOf("."));
        
        // 保存文件
        file.transferTo(new File("C:/Users/17433/Desktop/images/" + resFileName));
        
        return Result.success();
    }
}