1、去七牛云注册，建好自有空间

2、导入依赖

<dependency><groupId>com.qiniu</groupId><artifactId>qiniu-java-sdk</artifactId><version>[7.7.0, 7.7.99]</version>
</dependency>

3、我这里是服务器直传，将本地的图片上传到七牛云托管，建好QiniuUtils工具类

package com.mszlu.blog.util;import com.alibaba.fastjson.JSON;
import com.qiniu.http.Response;
import com.qiniu.storage.Configuration;
import com.qiniu.storage.Region;
import com.qiniu.storage.UploadManager;
import com.qiniu.storage.model.DefaultPutRet;
import com.qiniu.util.Auth;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;@Component
public class QiniuUtils {public static  final String url = "http://rpe08rotl.hn-bkt.clouddn.com/";  //改成你的外链域名@Value("${qiniu.accessKey}")
private  String accessKey;@Value("${qiniu.accessSecretKey}")
private  String accessSecretKey;public  boolean upload(MultipartFile file,String fileName){//构造一个带指定 Region 对象的配置类Configuration cfg = new Configuration(Region.huanan());  //改成你设置的区域，我是华南huanan//...其他参数参考类注释UploadManager uploadManager = new UploadManager(cfg);//...生成上传凭证，然后准备上传String bucket = "mszlu-jia";  //改成你的bucket名称//默认不指定key的情况下，以文件内容的hash值作为文件名try {
byte[] uploadBytes = file.getBytes();Auth auth = Auth.create(accessKey, accessSecretKey);String upToken = auth.uploadToken(bucket);Response response = uploadManager.put(uploadBytes, fileName, upToken);//解析上传成功的结果DefaultPutRet putRet = JSON.parseObject(response.bodyString(), DefaultPutRet.class);return true;} catch (Exception ex) {ex.printStackTrace();}
return false;}
}

注意点：改成你自己的url、区域和bucket名称！！！！！！！

4、去application.yml文件配置密钥accessKey和accessSecretKey

qiniu.accessKey=PL0iXbQMO465*******************    //改成你自己的
qiniu.accessSecretKey=itupVOK2********************  //改成你自己的

ps:密钥在七牛云中复制：点个人头像-密钥管理

5、去application.yml文件配置文件最大值

# 上传文件总的最大值
spring.servlet.multipart.max-request-size=20MB
# 单个文件的最大值
spring.servlet.multipart.max-file-size=5MB5

6、Controller层代码

package com.mszlu.blog.controller;import com.mszlu.blog.util.QiniuUtils;
import com.mszlu.blog.vo.Result;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;import java.util.UUID;@RestController
@RequestMapping("upload")
public class UploadController {@Autowiredprivate QiniuUtils qiniuUtils;@PostMappingpublic Result upload(@RequestParam("image") MultipartFile file){String originalFilename = file.getOriginalFilename();//唯一的文件名称 使用UUIDString fileName =  UUID.randomUUID().toString()+"." + StringUtils.substringAfterLast(originalFilename,".");//上传文件 长传到哪呢？ 七牛云boolean upload = qiniuUtils.upload(file, fileName);if(upload){return Result.success(QiniuUtils.url  + fileName);}return Result.fail(2001,"上传失败");}}

7、测试

七牛云接收图片成功