如何在Apache - CXF客户端的上传文件post调用中发送multipart/formData？

import org.apache.cxf.jaxrs.client.WebClient;
import org.apache.cxf.jaxrs.ext.multipart.Attachment;

import javax.ws.rs.core.MediaType;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

public class FileUploadClient {
    public static void main(String[] args) throws Exception {
        // 创建WebClient对象
        WebClient client = WebClient.create("http://example.com/upload");
        
        // 设置请求的媒体类型
        client.type(MediaType.MULTIPART_FORM_DATA_TYPE);
        
        // 设置请求的URL路径
        client.path("/uploadFile");
        
        // 创建要上传的文件
        File file = new File("path/to/file");
        InputStream inputStream = new FileInputStream(file);
        
        // 创建Attachment对象
        Attachment attachment = new Attachment("file", inputStream, MediaType.APPLICATION_OCTET_STREAM);
        
        // 发送POST请求
        client.post(attachment);
        
        // 关闭输入流和WebClient对象
        inputStream.close();
        client.close();
    }
}