1.sdk参考https://docs.ucloud.cn/storage_cdn/ufile/tools/sdk

java sdk https://github.com/ucloud/ufile-sdk-java

2.引入

<dependency>
    <groupId>cn.ucloud.ufile</groupId>
    <artifactId>ufile-client-java</artifactId>
    <version>2.4.1</version>
</dependency>

3.创建存储空间 https://console.ucloud.cn/ufile/ufile

4.创建令牌https://console.ucloud.cn/ufile/token

5.将公钥与私钥添加到配置文件

ucloud.ufile.public-key=
ucloud.ufile.private-key=

6.创建一个类

// 对象操作需要ObjectConfig来配置您的地区和域名后缀
ObjectConfig config = new ObjectConfig("your bucket region", "ufileos.com");

可换为lambda表达式

package life.majiang.community.provider;

import cn.ucloud.ufile.UfileClient;
import cn.ucloud.ufile.api.object.ObjectConfig;
import cn.ucloud.ufile.auth.ObjectAuthorization;
import cn.ucloud.ufile.auth.UfileObjectLocalAuthorization;
import cn.ucloud.ufile.bean.PutObjectResultBean;
import cn.ucloud.ufile.exception.UfileClientException;
import cn.ucloud.ufile.exception.UfileServerException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.io.File;
import java.io.InputStream;
import java.util.UUID;

@Service
public class UCloudProvider {
    @Value("${ucloud.ufile.public-key}")
    private String publicKey;
    @Value("${ucloud.ufile.private-key}")
    private String privateKey;

    //同步上传
    public String upload(InputStream fileStream,String mimeType,String fileName){
        String generatedFileName;
        String[] filePaths = fileName.split("\\.");
        if (filePaths .length>1) {
            generatedFileName = UUID.randomUUID().toString()+"."+filePaths[filePaths.length-1];
        }else {
            return null;
        }

        try {
            // 对象相关API的授权器
            ObjectAuthorization objectAuthorization = new UfileObjectLocalAuthorization(publicKey, privateKey);

            // 对象操作需要ObjectConfig来配置您的地区和域名后缀
            ObjectConfig config = new ObjectConfig("cn-bj", "ufileos.com");
            PutObjectResultBean response = UfileClient.object(objectAuthorization, config)
                    .putObject(fileStream, mimeType)
                    .nameAs(generatedFileName)
                    .toBucket("wangrui")
                    /**
                     * 是否上传校验MD5, Default = true
                     */
                    //  .withVerifyMd5(false)
                    /**
                     * 指定progress callback的间隔, Default = 每秒回调
                     */
                    //  .withProgressConfig(ProgressConfig.callbackWithPercent(10))
                    /**
                     * 配置进度监听
                     */
                    .setOnProgressListener((bytesWritten, contentLength) -> {

                    })
                    .execute();
        } catch (UfileClientException e) {
            e.printStackTrace();
            return null;
        } catch (UfileServerException e) {
            e.printStackTrace();
            return null;
        }
        return generatedFileName;
    }


}

package life.majiang.community.controller;

import life.majiang.community.dto.FileDTO;
import life.majiang.community.provider.UCloudProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@Controller
public class FileController {
    @Autowired
    private UCloudProvider uCloudProvider;

    @RequestMapping("/file/upload")
    @ResponseBody
    public FileDTO upload(HttpServletRequest request){
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)request;
        MultipartFile file = multipartRequest.getFile("editormd-image-file");
        try {
            uCloudProvider.upload(file.getInputStream(),file.getContentType(),file.getOriginalFilename());
        } catch (IOException e) {
            e.printStackTrace();
        }
        FileDTO fileDTO = new FileDTO();
        fileDTO.setSuccess(1);
        fileDTO.setUrl("/images/bk.png");
        return fileDTO;
    }
}