bluemix对象存储文件上载成功，但0kb文件正在使用java上载到对象存储

import com.ibm.cloud.objectstorage.*;
import com.ibm.cloud.objectstorage.auth.*;
import com.ibm.cloud.objectstorage.oauth.*;
import com.ibm.cloud.objectstorage.services.s3.*;
import com.ibm.cloud.objectstorage.services.s3.model.*;

public class BluemixObjectStorageUploader {
    public static void main(String[] args) {
        String endpointUrl = "对象存储的终端节点URL";
        String apiKey = "API密钥";
        String serviceInstanceId = "服务实例ID";
        String bucketName = "存储桶名称";
        String fileName = "要上传的文件名";
        
        AWSCredentials credentials = new BasicIBMOAuthCredentials(apiKey, serviceInstanceId);
        ClientConfiguration clientConfig = new ClientConfiguration().withRequestTimeout(5000);
        
        AmazonS3 cosClient = AmazonS3ClientBuilder.standard()
                .withCredentials(new AWSStaticCredentialsProvider(credentials))
                .withEndpointConfiguration(new EndpointConfiguration(endpointUrl, ""))
                .withPathStyleAccessEnabled(true)
                .withClientConfiguration(clientConfig)
                .build();
        
        PutObjectRequest request = new PutObjectRequest(bucketName, fileName, new File(fileName));
        PutObjectResult result = cosClient.putObject(request);
        
        System.out.println("文件上传成功！");
    }
}