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在Java中使用CloseableHttpClient来实现附带form data参数userId实现上传文件，可以使用HttpPost请求，然后通过MultipartEntityBuilder来构建请求体：
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;import java.io.File;
import java.io.IOException;public class FileUploader {public static void main(String[] args) {CloseableHttpClient httpClient = HttpClients.createDefault();HttpPost httpPost = new HttpPost("http://example.com/upload");// 构建请求体，添加文件和form data参数MultipartEntityBuilder builder = MultipartEntityBuilder.create();builder.addBinaryBody("file", new File("path/to/file")); // 添加文件builder.addTextBody("userId", "123"); // 添加form data参数HttpEntity multipart = builder.build();httpPost.setEntity(multipart);try {HttpResponse response = httpClient.execute(httpPost);HttpEntity responseEntity = response.getEntity();String responseBody = EntityUtils.toString(responseEntity);// 处理响应结果System.out.println(responseBody);// 关闭连接httpClient.close();} catch (IOException e) {e.printStackTrace();}}
}
请记得将上述代码中的http://example.com/upload替换为实际的上传文件地址，并将path/to/file替换为实际文件的路径。
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