1引入七牛依赖

<dependency>
    <groupId>com.qiniu</groupId>
    <artifactId>qiniu-java-sdk</artifactId>
    <version>[7.2.0, 7.2.99]</version>
</dependency>

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>19.0</version>
</dependency>

2：七牛工具类

import com.google.gson.Gson;
import com.qiniu.common.QiniuException;
import com.qiniu.common.Zone;
import com.qiniu.http.Response;
import com.qiniu.storage.BucketManager;
import com.qiniu.storage.Configuration;
import com.qiniu.storage.UploadManager;
import com.qiniu.storage.model.BatchStatus;
import com.qiniu.storage.model.DefaultPutRet;
import com.qiniu.util.Auth;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.io.*;
import java.net.URLEncoder;
import java.util.*;

@Component
@Slf4j
public class QiNiuUtils {
    @Value(value = "${qiNiu.images.accessKey}")
    private String accessKey;
    @Value(value = "${qiNiu.images.secretKey}")
    private String secretKey;
    @Value(value = "${qiNiu.images.bucket}")
    private String bucket;
    @Value(value = "${qiNiu.images.domainOfBucket}")
    private String domainOfBucket;

    public Map<String, String> uploadImages(File file) {
        Configuration cfg = new Configuration(Zone.zone0());                //zong1() 代表华北地区
        UploadManager uploadManager = new UploadManager(cfg);
        String fileName = UUID.randomUUID().toString().replace("-", "") + "_" + file.getName();//在七牛云中图片的命名
        Auth auth = Auth.create(accessKey, secretKey);
        String upToken = auth.uploadToken(bucket);
        Map<String, String> map = new HashMap<>();
        try {
            Response response = uploadManager.put(file, fileName, upToken);
            //解析上传成功的结果
            DefaultPutRet putRet = new Gson().fromJson(response.bodyString(), DefaultPutRet.class);
            map.put("imageName", putRet.key);
            map.put("imageHash", putRet.hash);
        } catch (QiniuException ex) {
            Response r = ex.response;
            try {
                log.error(r.bodyString());
            } catch (QiniuException ex2) {
                //ignore
            }
        }
        return map;
    }


    public String downLoadImage(String path) throws Exception {
        String encodedFileName = URLEncoder.encode(path, "utf-8").replace("+", "%20");
        return String.format("%s/%s", domainOfBucket, encodedFileName);
        //  Auth auth = Auth.create(accessKey, secretKey);
        // long expireInSeconds = 3600;//1小时，可以自定义链接过期时间
        //  return auth.privateDownloadUrl(publicUrl, expireInSeconds);
    }

    public List<Map<Integer, String>> deleteImages(String[] keyList) {
        //构造一个带指定Zone对象的配置类
        Configuration cfg = new Configuration(Zone.zone0());
        Auth auth = Auth.create(accessKey, secretKey);
        BucketManager bucketManager = new BucketManager(auth, cfg);

        try {
            //单次批量请求的文件数量不得超过1000
            BucketManager.BatchOperations batchOperations = new BucketManager.BatchOperations();
            batchOperations.addDeleteOp(bucket, keyList);
            Response response = bucketManager.batch(batchOperations);
            BatchStatus[] batchStatusList = response.jsonToObject(BatchStatus[].class);
            List<Map<Integer, String>> mapList = new ArrayList<>();
            Map<Integer, String> map = new HashMap<>();
            for (int i = 0; i < keyList.length; i++) {
                BatchStatus status = batchStatusList[i];
                String key = keyList[i];
                System.out.print(key + "\t");
                if (status.code != 200) {
                    log.error("七牛删除文件出错了-------{}", status.data.error, key);
                    map.put(status.code, key);
                    mapList.add(map);
                }
            }
            return mapList;
        } catch (QiniuException ex) {
            log.error("七牛删除文件出错了-------{}", ex.response.toString());
        }
        return null;
    }
}

3：接口

import com.lemo.saas.result.ResultData;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.util.List;
import java.util.Map;

@Api(tags = "通用图片上传至七牛服务器接口")
@RequestMapping(value = "lemo/image")
public interface ImageManagementApiClient {
    @PostMapping(value = "upload", consumes = "multipart/form-data")
    @ApiOperation(value = "图片上传接口,返回data中的imageName为图片的名称")
    ResultData<Map<String, String>> imageUpload(@RequestParam("file")MultipartFile file);

    @GetMapping
    @ApiOperation(value = "根据图片的名称进行图片的下载,返回图片路径")
    ResultData<String> downloadImage(String name);

    @DeleteMapping
    @ApiOperation(value = "根据图片名称集合删除图片信息,如果返回data不为null,说明有部分图片未删除，已记录到日志中，实施手动删除，其中key为删除状态码，值为文件名称")
    ResultData<List<Map<Integer, String>>> deleteImage(String[] names);
}

4： 接口实现

import com.lemo.saas.constant.ExceptionEnum;
import com.lemo.saas.exception.MyException;
import com.lemo.saas.qiniu.QiNiuUtils;
import com.lemo.saas.qiniu.client.ImageManagementApiClient;
import com.lemo.saas.result.ResultData;
import com.lemo.saas.utils.MyFileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.util.List;
import java.util.Map;

@RestController
public class ImageManagementApiImpl implements ImageManagementApiClient {
    @Autowired
    private QiNiuUtils qiNiuUtils;
    @Override
    public ResultData<Map<String, String>> imageUpload(@RequestParam("file")MultipartFile file) {
        if (file.isEmpty()) {
            throw new MyException(ExceptionEnum.FILE_NOT_FOUND_ERROR);
        }
        File toFile = MyFileUtils.MultipartFileToFile(file);
        Map<String, String> map = qiNiuUtils.uploadImages(toFile);
        return ResultData.success(map);
    }

    @Override
    public ResultData<String> downloadImage(String path) {
        String loadImage;
        try {
           loadImage = qiNiuUtils.downLoadImage(path);
        }catch (Exception e ){
            return ResultData.success("图片下载错误");
        }
        return ResultData.success(loadImage);
    }

    @Override
    public ResultData<List<Map<Integer, String>>> deleteImage(String[] names) {
        List<Map<Integer, String>> mapList = qiNiuUtils.deleteImages(names);
        return ResultData.success(mapList);
    }
}