前后端分离，如何使用Ucloud当作静态资源服务器

ゞ浴缸里的玫瑰 2022-06-12 11:50 180阅读 0赞

## 以下以上传图片到ucloud ##

题记：当app或者前端在执行上传图片到ucloud服务器的时候，需要先来java服务器端接口做一次鉴权，获得许可，然后就可以上传图片到uclould了.

1.首先要在pom文件中增加ucloud依赖配置

<dependency>
                <groupId>com.ucloud</groupId>
                <artifactId>ufile_sdk</artifactId>
                <version>1.0.0</version>
            </dependency>
            <dependency>
                <groupId>org.apache.http</groupId>
                <artifactId>httpcore</artifactId>
                <version>4.1.4</version>
            </dependency>
            <dependency>
                <groupId>org.apache</groupId>
                <artifactId>httpclient</artifactId>
                <version>4.1.3</version>
            </dependency>
            <dependency>
                <groupId>commons-httpclient</groupId>
                <artifactId>commons-httpclient</artifactId>
                <version>3.1</version>
            </dependency>

2.建一个controller

@RestController
    @RequestMapping("/app/common")
    public class CommonAppController extends BaseAppController { 
        @Autowired
        private UCloudService uCloudService;
    
    @PostMapping("/signUploadContent")
        public JsonResult signUploadContent(String contentMD5, String contentType, String fileName) {
            //获取头像上传的ucloud的数据签名
            UploadSignature uploadSignature = uCloudService.sign(contentMD5, contentType, fileName, FileTypeEnum.AVATAR);
    
            return success(uploadSignature);
        }
        }

3.ucloud 的服务接口

public interface UCloudService {
    
        UploadSignature sign(String contentMD5, String contentType, String fileName, FileTypeEnum fileType);
    }

4.ucloud的实现类

@Service
    @Configuration
    public class UCloudServiceImpl implements UCloudService{ 
    
    
        @Value("${ucloud.publicKey}")
        private String publicKey;
    
        @Value("${ucloud.privateKey}")
        private String privateKey;
    
        @Value("${ucloud.bucket}")
        private String bucket;
    
        @Value("${ucloud.proxySuffix}")
        private String proxySuffix;
    
        @Value("${ucloud.cdn.https.host}")
        private String cdnHttpsHost;
    
        private static HmacSHA1 hmacSHA1 = new HmacSHA1();
    
        /** * * stringToSign = httpMethod + "\n" + contentMD5 + "\n" + contentType + "\n" + date + "\n" + * 如 stringToSign = "PUT\n1f0d1bbab0442b1c893d4a0476396321\napplication/jpeg\n\n/gamecat-pkg/abs.jpg" * canonicalUCloudHeaders + canonicalResource; * signature = HmacSha1.sign(privateKey + stringToSign) * authorization = “UCloud ${publicKey}:${signature} * * @param contentMD5 * @param contentType * @return */
        @Override
        public UploadSignature sign(String contentMD5, String contentType, String fileName, FileTypeEnum fileType) {
    
            StringBuilder stringToSign = new StringBuilder("PUT");
            stringToSign.append("\n");
            stringToSign.append(contentMD5);
            stringToSign.append("\n");
            stringToSign.append(contentType);
            stringToSign.append("\n\n");
            stringToSign.append("/");
            stringToSign.append(bucket);
            stringToSign.append("/");
    
            /**key值**/
            StringBuilder key = new StringBuilder(fileType.getPrefix());
            key.append("/").append(UUID.randomUUID().toString());
    
            if (-1 != fileName.lastIndexOf(".")) {
                key.append(".").append(fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length()));
            }
            stringToSign.append(key.toString());
    
            /**authoriztion值**/
            String signature = hmacSHA1.sign(privateKey, stringToSign.toString());
            StringBuilder authorization = new StringBuilder("UCloud");
            authorization.append(" ");
            authorization.append(publicKey).append(":").append(signature);
    
            /**下载链接**/
            StringBuilder downloadPath = new StringBuilder();
            downloadPath. append(cdnHttpsHost).
                    append("/").
                    append(key.toString());
    
    
            UploadSignature uploadSignature = new UploadSignature();
            uploadSignature.setKey(key.toString());
            uploadSignature.setAuthorization(authorization.toString());
            uploadSignature.setDownloadPath(downloadPath.toString());
            uploadSignature.setBucket(bucket);
            uploadSignature.setProxySuffix(proxySuffix);
    
            return uploadSignature;
        }
    }

5.实现类加载的配置文件（请根据个人需要填写）

#ucloud
    ucloud.publicKey=公钥
    ucloud.privateKey=私
    ucloud.proxySuffix=
    ucloud.bucket=
    ucloud.cdn.https.host=