为什么dropwizard不上传xls文件？

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.4</version>
</dependency>

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.io.File;
import java.util.List;

@Path("/upload")
public class UploadResource {

    @POST
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public Response uploadFile(List<FileItem> fileItems) {
        // 处理上传的文件
        for (FileItem fileItem : fileItems) {
            if (!fileItem.isFormField()) {
                try {
                    // 保存文件到指定路径
                    fileItem.write(new File("/path/to/save/file.xls"));
                } catch (Exception e) {
                    e.printStackTrace();
                    return Response.serverError().build();
                }
            }
        }
        return Response.ok().build();
    }
}

import io.dropwizard.Application;
import io.dropwizard.Configuration;
import io.dropwizard.setup.Environment;

public class MyApplication extends Application<Configuration> {

    public static void main(String[] args) throws Exception {
        new MyApplication().run(args);
    }

    @Override
    public void run(Configuration configuration, Environment environment) {
        environment.jersey().register(new UploadResource());
    }
}