MYSQL和Swift-上传图片和FILE || 使用Alamofire会更好吗？

Question

我正在尝试上传图片和文本文件（将其上传为数据）。

到目前为止，我可以正确地单独上传图像，也可以成功上传文本文件数据，并以.txt格式成功上传。

现在，我需要同时上传图片和.txt文件…

我不确定如何在我的IOS应用中为此设置参数…。

到目前为止，这就是我上传.txt文件的方式（基本上与我上传图片的方式相同，但是我更改了“文件名”和“ mimetype”）

func createBodyWithParameters(parameters: [String : Any]?, filePathKey: String?,filePathKey1: String?, imageDataKey: NSData,imageDataKey1: NSData, boundary: String) -> NSData {

        let body = NSMutableData();

        if parameters != nil {
            for (key, value) in parameters! {
                body.appendString("--\(boundary)\r\n")
                body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
                body.appendString("\(value)\r\n")
            }
        }

        let filename = "post-\(uuid).txt"
        let mimetype = "image/txt"

        body.appendString("--\(boundary)\r\n")
        body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
        body.appendString("Content-Type: \(mimetype)\r\n\r\n")


        body.append(imageDataKey as Data)

        body.appendString("\r\n")
        body.appendString("--\(boundary)--\r\n")

        return body
    }

现在，我不确定如何使用该参数保存图像和.txt文件。

但是，这是我快速上传代码的其余部分：

 let param = [
            "id" : id,
            "uuid" : uuid,
            "Text" : Text,
            "Title" : Title
           ] as [String : Any]

        let boundary = "Boundary-\(NSUUID().uuidString)"
        request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")

        let data: Data = NSKeyedArchiver.archivedData(withRootObject: blogattributedText)


        var imageData = NSData()
        let image = CoverImage
        let width = CGSize(width: self.view.frame.width, height: image.size.height * (self.view.frame.width / image.size.width))
        imageData = UIImageJPEGRepresentation(imageWithImage(image, scaledToSize: width), 0.5)! as NSData

   // ... body
    request.httpBody = createBodyWithParameters(parameters: param, filePathKey: "file",filePathKey1: "file1", imageDataKey: data as NSData,imageDataKey1: imageData as NSData, boundary: boundary) as Data

如果有人需要查看我的代码或不明白我的问题，请告诉我！

在此先感谢任何可以提供帮助的人！

Answer 1

如果您不想迷失在创建复杂请求的过程中，那么像Alamofire这样的第三方库将很聪明。它与AFNetworking的作者相同，但是它是本机Swift库。

因此，Alamofire实现可能如下所示：

func performRequest(urlString: String, id: String, uuid: String, text: String, title: String, blogAttributedText: NSAttributedString, image: UIImage) {

    let parameters = [
        "id" : id,
        "uuid" : uuid,
        "Text" : text,
        "Title" : title
    ]

    let imageData = UIImageJPEGRepresentation(image, 0.5)!

    let blogData = NSKeyedArchiver.archivedData(withRootObject: blogAttributedText)

    Alamofire.upload(
        multipartFormData: { multipartFormData in
            for (key, value) in parameters {
                if let data = value.data(using: .utf8) {
                    multipartFormData.append(data, withName: key)
                }
            }
            multipartFormData.append(imageData, withName: "image", fileName: "image.jpg", mimeType: "image/jpeg")
            multipartFormData.append(blogData, withName: "blog", fileName: "blog.archive", mimeType: "application/octet-stream")
    },
    to: urlString,
    encodingCompletion: { encodingResult in
        switch encodingResult {
        case .success(let upload, _, _):
            upload
                .validate()
                .responseJSON { response in
                    switch response.result {
                    case .success(let value):
                        print("responseObject: \(value)")
                    case .failure(let responseError):
                        print("responseError: \(responseError)")
                    }
            }
        case .failure(let encodingError):
            print("encodingError: \(encodingError)")
        }
    })
}

如果您要自己建立此请求，我建议一些事情。首先，由于您要发送不同类型的文件，因此可能需要一些不错的类型来封装它：

struct FilePayload {
    let fieldname: String
    let filename: String
    let mimetype: String
    let payload: Data
}

我也不知道该如何制作image/txt哑剧类型。我可能会使用application/octet-stream存档。

无论如何，请求的构建可能如下：

/// Create request.
///
/// - Parameters:
///   - url:                The URL to where the post will be sent.
///   - id:                 The identifier of the entry
///   - uuid:               The UUID of the entry
///   - text:               The text.
///   - title:              The title.
///   - blogAttributedText: The attributed text of the blog entry.
///   - image:              The `UIImage` of the image to be included.
///
/// - Returns: The `URLRequest` that was created

func createRequest(url: URL, id: String, uuid: String, text: String, title: String, blogAttributedText: NSAttributedString, image: UIImage) -> URLRequest {
    let parameters = [
        "id" : id,
        "uuid" : uuid,
        "Text" : text,     // I find it curious to see uppercase field names (I'd use lowercase for consistency's sake, but use whatever your PHP is looking for)
        "Title" : title
    ]

    let boundary = "Boundary-\(NSUUID().uuidString)"

    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
    request.setValue("application/json", forHTTPHeaderField: "Accept")  // adjust if your response is not JSON

    // use whatever field name your PHP is looking for the image; I used `image`

    let imageData = UIImageJPEGRepresentation(image, 0.5)!
    let imagePayload = FilePayload(fieldname: "image", filename: "image.jpg", mimetype: "image/jpeg", payload: imageData)

    // again, use whatever field name your PHP is looking for the image; I used `blog`

    let blogData = NSKeyedArchiver.archivedData(withRootObject: blogAttributedText)
    let blogPayload = FilePayload(fieldname: "blog", filename: "blog.archive", mimetype: "application/octet-stream", payload: blogData)

    request.httpBody = createBody(with: parameters, files: [imagePayload, blogPayload], boundary: boundary)

    return request
}

/// Create body of the multipart/form-data request.
///
/// - Parameters:
///   - parameters: The optional dictionary containing keys and values to be passed to web service.
///   - files:      The list of files to be included in the request.
///   - boundary:   The `multipart/form-data` boundary
///
/// - Returns: The `Data` of the body of the request.

private func createBody(with parameters: [String: String]?, files: [FilePayload], boundary: String) -> Data {
    var body = Data()

    if parameters != nil {
        for (key, value) in parameters! {
            body.append("--\(boundary)\r\n")
            body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
            body.append("\(value)\r\n")
        }
    }

    for file in files {
        body.append("--\(boundary)\r\n")
        body.append("Content-Disposition: form-data; name=\"\(file.fieldname)\"; filename=\"\(file.filename)\"\r\n")
        body.append("Content-Type: \(file.mimetype)\r\n\r\n")
        body.append(file.payload)
        body.append("\r\n")
    }

    body.append("--\(boundary)--\r\n")
    return body
}

/// Create boundary string for multipart/form-data request
///
/// - returns:            The boundary string that consists of "Boundary-" followed by a UUID string.

private func generateBoundaryString() -> String {
    return "Boundary-\(NSUUID().uuidString)"
}

哪里

extension Data {

    /// Append string to Data
    ///
    /// Rather than littering my code with calls to `dataUsingEncoding` to convert strings to `Data`, and then add that data to the `Data`, this wraps it in a nice convenient little `Data` extension. This converts using UTF-8.
    ///
    /// - parameter string:       The string to be added to the mutable `Data`.

    mutating func append(_ string: String) {
        if let data = string.data(using: .utf8) {
            append(data)
        }
    }
}

显然，这是Swift 3代码，因此我删除了NSMutableData参考。