HttpClient上传大文件并显示发送的字节数

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import java.io.File;
import java.io.IOException;

public class FileUploader {
    public static void main(String[] args) {
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost("http://example.com/upload");

        File file = new File("path/to/file");
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.addBinaryBody("file", file);
        HttpEntity multipart = builder.build();

        httpPost.setEntity(multipart);

        try {
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity responseEntity = response.getEntity();
            if (responseEntity != null) {
                String responseString = EntityUtils.toString(responseEntity);
                System.out.println("Response: " + responseString);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}