七牛云上传图片并返回图片URL

1.七牛云注册登录

https://portal.qiniu.com/signup/choice

完成实名认证，传身份证正反面之等，大概一个小时左右就认证成功了

2.新建存储空间

地区可以自己选择

3.代码

在pom.xml添加七牛云依赖

<dependency>
    <groupId>com.qiniu</groupId>
    <artifactId>qiniu-java-sdk</artifactId>
    <version>7.1.1</version>
</dependency>

七牛云图片操作工具类

import cn.hutool.core.util.StrUtil;
import com.qiniu.common.QiniuException;
import com.qiniu.http.Response;
import com.qiniu.storage.BucketManager;
import com.qiniu.storage.UploadManager;
import com.qiniu.util.Auth;
import com.qiniu.util.Base64;
import com.qiniu.util.StringMap;
import com.qiniu.util.UrlSafeBase64;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;

import java.io.IOException;

public class QiniuCloudUtil {
    // 设置需要操作的账号的AK和SK
    private static final String ACCESS_KEY = "你的AK";
    private static final String SECRET_KEY = "你的sk";

    // 要上传的空间
    private static final String bucketname = "你的空间名称";

    // 密钥
    private static final Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);

    private static final String DOMAIN = "你的图片上传路径";

    private static final String style = "自定义的图片样式";

    public String getUpToken() {
        return auth.uploadToken(bucketname, null, 3600, new StringMap().put("insertOnly", 1));
    }

    // 普通上传
    public String upload(String filePath, String fileName) throws IOException {
        // 创建上传对象
        UploadManager uploadManager = new UploadManager();
        try {
            // 调用put方法上传
            String token = auth.uploadToken(bucketname);
            //判断字符串为空的工具类，可用自己的
            if (StrUtil.isEmpty(token)) {
                System.out.println("未获取到token，请重试！");
                return null;
            }
            Response res = uploadManager.put(filePath, fileName, token);
            // 打印返回的信息
            System.out.println(res.bodyString());
            if (res.isOK()) {
                Ret ret = res.jsonToObject(Ret.class);
                //如果不需要对图片进行样式处理，则使用以下方式即可
                //return DOMAIN + ret.key;
                return DOMAIN + ret.key + "?" + style;
            }
        } catch (QiniuException e) {
            Response r = e.response;
            // 请求失败时打印的异常的信息
            System.out.println(r.toString());
            try {
                // 响应的文本信息
                System.out.println(r.bodyString());
            } catch (QiniuException e1) {
                // ignore
            }
        }
        return null;
    }


    //base64方式上传
    public String put64image(byte[] base64, String key) throws Exception {
        String file64 = Base64.encodeToString(base64, 0);
        Integer l = base64.length;
        String url = "http://upload.qiniu.com/putb64/" + l + "/key/" + UrlSafeBase64.encodeToString(key);
        //非华东空间需要根据注意事项 1 修改上传域名
        RequestBody rb = RequestBody.create(null, file64);
        Request request = new Request.Builder().
                url(url).
                addHeader("Content-Type", "application/octet-stream")
                .addHeader("Authorization", "UpToken " + getUpToken())
                .post(rb).build();
        //System.out.println(request.headers());
        OkHttpClient client = new OkHttpClient();
        okhttp3.Response response = client.newCall(request).execute();
        System.out.println(response);
        //如果不需要添加图片样式，使用以下方式
        //return DOMAIN + key;
        return DOMAIN + key + "?" + style;
    }


    // 普通删除(暂未使用以下方法，未测试)
    public void delete(String key) throws IOException {
        // 实例化一个BucketManager对象
        BucketManager bucketManager = new BucketManager(auth);
        // 此处的6666是去掉：http://你的图片上传路径/,剩下的key就是图片在七牛云的名称
        key = key.substring(6666);
        try {
            // 调用delete方法移动文件
            bucketManager.delete(bucketname, key);
        } catch (QiniuException e) {
            // 捕获异常信息
            Response r = e.response;
            System.out.println(r.toString());
        }
    }

    class Ret {
        public long fsize;
        public String key;
        public String hash;
        public int width;
        public int height;
    }
}

4.获取需要操作的账号的AK和SK

进入个人中心-密钥管理

5.获取要上传的空间

自己设置的空间名

6.获取图片上传URL路径

获取自定义的图片样式
private static final String style = “自定义的图片样式”;
我这里是需要给图片添加水印，所以自定义了图片样式，如果对于上传图片没有格式要求，则可以跳过此步骤。

7.后端代码调用

@ResponseBody
    @RequestMapping(value="/uploadImg", method=RequestMethod.POST)
    public ResultInfo uploadImg(@RequestParam MultipartFile image, HttpServletRequest request) {
        ResultInfo result = new ResultInfo();
        if (image.isEmpty()) {
            result.setCode(400);
            result.setMsg("文件为空，请重新上传");
            return result;
        }

        try {
            byte[] bytes = image.getBytes();
            String imageName = UUID.randomUUID().toString();

            QiniuCloudUtil qiniuUtil = new QiniuCloudUtil();
            try {
                //使用base64方式上传到七牛云
                String url = qiniuUtil.put64image(bytes, imageName);
                result.setCode(200);
                result.setMsg("文件上传成功");
                result.setInfo(url);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return result;
        } catch (IOException e) {
            result.setCode(500);
            result.setMsg("文件上传发生异常！");
            return result;
        }
    }

8.前端代码调用

VUE代码

uploadImg: async function(id) {  
    var vm = this;
    var fileInput = document.getElementById("uniqueId");  
    var formData = new FormData();
    formData.append("image", fileInput.files[0]);
    this.$axios({
        method: "post",
        url: '/api/article/uploadImg',
        data: formData
    }).then((response) = >{
        if (response.data.code == 200) {
            //后端返回的url地址
            var url = response.data.info;
            if (url != null && url.length > 0) {   
                vm.addImgRange = vm.$refs.myQuillEditor.quill.getSelection();
                var index = vm.addImgRange != null ? vm.addImgRange.index: 0;   vm.$refs.myQuillEditor.quill.insertEmbed(index, 'image', url);  
            } else {
              this.$Message.error("图片添加失败！");  
            }
        } else {
            this.$Message.error(response.data.msg);
        }
    });   
}