使用多部分请求上传文件 - Swift 4答案

【问题标题】：Upload files using multipart request - Swift 4使用多部分请求上传文件 - Swift 4
【发布时间】：2018-10-25 04:09:19
【问题描述】：

我必须使用多部分请求在服务器上上传文件。对于网络通话，我使用的是 Alamofire。

到目前为止我所做的如下

请求服务：

多部分请求：-

let headers: HTTPHeaders = [
            "Content-type": "multipart/form-data"
        ]
        let  fileData = Filedata() // getting data from local path

        let URL = try! URLRequest(url: "https://SomeUrl/upload", method: .post, headers: headers)
        Alamofire.upload(multipartFormData: { (multipartFormData) in

             //multipartFormData.append(fileData, withName: "image", fileName: "image", mimeType: "image/png")
               multipartFormData.append(fileData, withName: "file")

        }, with: URL, encodingCompletion: { (result) in

            switch result {
            case .success(let upload, _, _):

                upload.responseJSON { response in
                    print(response)
                }
            case .failure(let encodingError):
                print(encodingError)
            }

        })

回应：-

{ Status Code: 400, Headers {
    Connection =     (
        close
    );
    "Content-Type" =     (
        "application/json;charset=UTF-8"
    );
    Date =     (
        "Tue, 15 May 2018 10:34:15 GMT"
    );
    "Transfer-Encoding" =     (
        Identity
    );
} }
[Data]: 171 bytes
[Result]: SUCCESS: {
    error = "Bad Request";
    message = "Required request part 'file' is not present";
    path = "/files/safebolt.org/upload";
    status = 400;
    timestamp = "2018-05-15T10:34:15.715+0000";
}

谁能告诉我我在请求中做错了什么？

【问题讨论】：

你可以使用 alamofire
我提出的要求是用 alamofire。
你是上传单张图片还是多张图片
你试过multipartFormData.append(fileData, withName: "file", fileName: "file", mimeType: "image/png")吗？
@GreyHands 请在回答中发布上述行。我会接受它。它有效。

标签： ios iphone swift file-upload alamofire

【解决方案1】：

尝试：

multipartFormData.append(fileData, withName: "file", fileName: "file", mimeType: "image/png")

【讨论】：

【解决方案2】：

我创建了一个函数。希望它对你有用。

//Alamofire file upload code
func requestWith(URLString: String,
                 imageData: Data?,
                 fileName: String?,
                 pathExtension: String?,
                 parameters: [String : Any],
                 onView: UIView?,
                 vc: UIViewController,
                 completion:@escaping (Any?) -> Void,
                 failure: @escaping (Error?) -> Void) {

    let headers: HTTPHeaders = [
        "Content-type": "multipart/form-data"
    ]

    let URL = BASE_PATH + URLString
    Alamofire.upload(multipartFormData: { (multipartFormData) in
        for (key, value) in parameters {
            multipartFormData.append("\(value)".data(using: String.Encoding.utf8)!, withName: key as String)
        }

        if let data = imageData {
            multipartFormData.append(data, withName: "fileUpload", fileName: "\(fileName!).\(pathExtension!)", mimeType: "\(fileName!)/\(pathExtension!)")
        }

    }, usingThreshold: UInt64.init(), to: URL, method: .post, headers: headers) { (result) in

        switch result {
        case .success(let upload, _, _):
            upload.responseJSON { response in
                if let err = response.error {
                    failure(err)
                    return
                }
                completion(response.result.value)
            }
        case .failure(let error):
            print("Error in upload: \(error.localizedDescription)")
            failure(error)
        }
    }
}

【讨论】：

我的和你的差不多。我仍然收到错误请求的错误。
什么是状态码，在邮递员中工作，网络方法对吗？
您是如何发送数据的？参数传递有问题
那个 FileData() 是什么？是数据类型吗？查看我的代码 var 数据：数据？ = 无 var 文件名：字符串？ = nil if targetListDeviceFilePath != nil { let path = targetListDeviceFilePath?.path data = FileManager.default.contents(atPath: path!) fileName = targetListDeviceFilePath?.lastPathComponent } 我正在从文件管理器中选择文件
class func getFileData(path : String) -> Data { if (path.isFileExists()) { let fileURL = path.documentDirectoryPath() let data = try!数据（contentsOf：fileURL）返回数据}返回数据（）}

【解决方案3】：

试试这个，是一个对我有用的例子。如果要为图像转换编码 64，请添加扩展名。如果只是发布数据和图像，此代码可能会有所帮助。

//为post请求创建参数

    let parameters: Parameters=[

        "ad_title":classText1.text!,
        "ad_description":classText2.text!,
        "ad_category":CategoryClass.text!,
        "ad_condition":classText3.text!,
        "ad_username":classText6.text!,
        "ad_usermobile":classText7.text!,
        "ad_city":classText8.text!,
        "ad_price":classText4.text!,
        "negotiable":classText5.text!,
        "image1":adImage1.image!,
        "image2":adImage2.image!,
        "image3":adImage3.image!,
        "image4":adImage4.image!


    ]
    Alamofire.upload(multipartFormData: { (multipartFormData) in
        for (key, value) in parameters {
            multipartFormData.append("\(value)".data(using: String.Encoding.utf8)!, withName: key as String)
        }


    }, usingThreshold: UInt64.init(), to: URL, method: .post) { (result) in
        switch result{
        case .success(let upload, _, _):
            upload.responseJSON { response in
                print("Succesfully uploaded  = \(response)")
                if let err = response.error{

                    print(err)
                    return
                }

            }
        case .failure(let error):
            print("Error in upload: \(error.localizedDescription)")

        }
    }

【讨论】：