七牛云API的使用包括Ajax上传功能及凭证生成

api,使用,包括,ajax,上传,功能,凭证,生成 · 浏览次数 : 317

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## Summary of the code This code defines three functions for handling file upload in a web application: **1. UpLoadToken()**: This function generates a temporary upload token using the Qiniu Auth library and a PutPolicy object. It requires the key and a JSON-encoded policy string as input. **2. UpLoad()**: This function performs the actual upload to Qiniu. It takes the file path, key, and token as input. It configures the Qiniu storage configuration and uses a FormUploader object to handle the upload request. **3. Down()**: This function retrieves the file from Qiniu using a different configuration. It requires the key and the URL of the file on Qiniu. ## Key points * The code uses Qiniu's `PutPolicy` to define upload options such as expires time, scope, and return body. * It also configures the Qiniu storage configuration with relevant settings like CDN, host, and security. * The `UploadImage` endpoint accepts a base64-encoded image data and posts it to Qiniu. * The success callback of `UploadImage` updates the database with the uploaded image key. ## Overall, this code demonstrates how to implement efficient and secure file upload to Qiniu using both server-side and client-side approaches.

正文

1.服务端（主要用于生成上传，删除，下载等凭证）

引入Qiniu的Get包。包就叫Qiniu。

//上传凭证

       //上传凭证：其余凭证类似的写法
　　　　 public string UpLoadToken()
        {
            //密钥
            Mac mac = new Mac("AK", "SK");
            // 存储空间名
            string Bucket = "wximagess";
            //上传凭证
            PutPolicy putPolicy = new PutPolicy();
            //凭证有效时间
            putPolicy.SetExpires(7200); 
            //存储空间名 。覆盖上传要写成  putPolicy.Scope = Bucket:key;  key是文件名
            putPolicy.Scope = Bucket;
            //上传的内容定时删除(自定义)30天
            putPolicy.DeleteAfterDays = 30;
            string token = Auth.CreateUploadToken(mac, putPolicy.ToJsonString());
            return token;
        }

服务端直接下载

　　·　　public string Down()
        {
            Mac mac = new Mac("AK", "SK");
            //下载的地址　　
            string domain = "http://rkp2te65d.bkt.clouddn.com";
　　　　　　　//下载的文件名
            string key = "测试上传2";
　　　　　　　//下载外链  3600外链有效期
            string privateUrl = DownloadManager.CreatePrivateUrl(mac, domain, key, 3600);
            Console.WriteLine(privateUrl);
            return privateUrl;
        }

服务端直接上传

   　   public string UpLoad()
        {
            //密钥
            Mac mac = new Mac("AK", "SK");
            //文件名
            string key = "测试上传2";
            // 本地文件路径
            string filePath = "C:\\素材\\图片\\6a04b428gy1fyrlfhjaz1g207i07ijy0.gif";
            // 存储空间名
            string Bucket = "XXX";
　　　　　　　//上传凭证
            PutPolicy putPolicy = new PutPolicy();
            putPolicy.SetExpires(7200);
            putPolicy.Scope = Bucket;
　　　　　　　//自定义返回结果，可不设置，也可根据官网自定义，这里是官网给的自定义例子
            putPolicy.ReturnBody = "{\"key\":\"$(key)\",\"hash\":\"$(etag)\",\"fsiz\":$(fsize),\"bucket\":\"$(bucket)\",\"name\":\"$(x:fname)\"}";
            putPolicy.DeleteAfterDays = 30;
　　　　　　　//凭证
            string token = Auth.CreateUploadToken(mac, putPolicy.ToJsonString());
　　　　　　　
            Config config = new Config();
            // 空间对应的机房.这里官网给的并不全，新出的空间地域无法直接引用，需要自己根据官网的地址New出新的机房、这里是华东浙江2
            config.Zone = new Qiniu.Storage.Zone
            {
                ApiHost = "api.qiniuapi.com",
                CdnUpHosts = new string[1] { "upload-cn-east-2.qiniup.com" },
                RsHost = "rs-cn-east-2.qiniuapi.com",
                RsfHost = "rsf-cn-east-2.qiniuapi.com",
                IovipHost = "iovip-cn-east-2.qiniuio.com",
                SrcUpHosts = new string[1] { "up-cn-east-2.qiniup.com" },
            };
            // 是否使用https域名  https收费，我不使用
            config.UseHttps = false;
            // 上传是否使用cdn加速
            config.UseCdnDomains = true;
　　　　　　　//表单上传。好像百兆以下都可以，超过百兆可以分片上传，图片使用表单上传就好，免费空间只有10G。上传图片还可，视频肯定不够用
            FormUploader target = new FormUploader(config);
            HttpResult result = target.UploadFile(filePath, key, token, null);
　　　　　　　　
            return "form upload result: " + result.ToString();
        }

2.Ajax请求上传图片

function A() {
        $.ajax({
            //请求服务端拿到上传凭证
            url: "http://xxxx",
            type: "get",
            success: function (res) {
                var token = res;
                // localData是图片的base64数据，你可以用任何方式得到你图片的Base64编码
                var localData = "XXXXX";
                //七牛云只需要Base64后面的内容，因此把多余的前缀删除
                localData = localData.replace("data:image/jgp;base64", "");
                //开始上传
                $.ajax({
                    url: "http://upload-cn-east-2.qiniup.com/putb64/-1",
                    type: "post",
                    beforeSend(request) {
                        request.setRequestHeader("Content-Type", "application/octet-stream");
                        request.setRequestHeader("Authorization", "UpToken " + token);
                    },
                    data: localData,
                    success: function (res) {
                        //上传成功后把文件名key存到自己的数据库里
                        var imageKey = res.key;
                        $.ajax({
                            url: "http://XXXX/UploadImage",
                            type: "post",
                            data: imageKey,
                            headers: {
                                "Content-Type": "application/json"
                            }
                            ,
                            success: function (res) {
                                alert(res);
                            }
                        })
                    }
                })
            }
        })
    }

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