Question

我需要将图像上传到服务器端点，其结构必须如下：

 { "image": { "file": imageData }, "access_token": access_token }

如何使用NSURLSession（或者甚至是Alamofire或AFNetworking）发送此类请求？

Answer 1

您不能只在JSON请求中包含二进制图像数据。 JSON需要文本表示，所以如果你这样做，你必须将它转换为字符串（例如base64编码），在JSON中使用它，然后服务器代码可能会在尝试使用它之前将base64字符串转换回二进制数据。

但是如果你是图像的base64编码，它可能看起来像：

// get image data

let imageData = UIImagePNGRepresentation(image)

// convert to base64

let base64String = imageData.base64EncodedStringWithOptions(nil)

// build parameters

let parameters = ["image": ["file" : base64String], "access_token" : accessToken]

// get JSON

var error: NSError?
let data = NSJSONSerialization.dataWithJSONObject(parameters, options: nil, error: &error)
assert(data != nil, "Unable to serialize \(error)")

// build request

let url = NSURL(string: "http://example.com/upload")!
let request = NSMutableURLRequest(URL: url)
request.addValue("text/json", forHTTPHeaderField: "Content-Type")
request.HTTPMethod = "POST"

let task = NSURLSession.sharedSession().uploadTaskWithRequest(request, fromData: data) { data, response, error in
    // check for basic connectivity errors

    if error != nil {
        println("error: \(error)")
        return
    }

    // check for server errors

    if let httpResponse = response as? NSHTTPURLResponse, let statusCode = httpResponse.statusCode as Int? {
        if statusCode != 200 {
            println("status code is \(statusCode)")
        }
    }

    // check for details of app-level server response, e.g. if JSON that was dictionary:

    var parseError: NSError?
    if let responseObject = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: &parseError) as? [String : AnyObject] {
        println(responseObject)
    } else {
        println("JSON parse failed: \(parseError)")
        println("response was: \(response)")
        let responseString = NSString(data: data, encoding: NSUTF8StringEncoding)
        println("responseString was: \(responseString)")
    }
}
task.resume()

如果您使用Alamofire，则会简化：

// build parameters

let parameters = ["image": ["file" : base64String], "access_token" : accessToken] as [String : AnyObject]

// build request

let urlString = "http://example.com/upload"

Alamofire.request(.POST, urlString, parameters: parameters, encoding: .JSON)
    .responseJSON(options: nil) { request, response, responseObject, error in
        if error != nil {
            println(error)
        } else {
            println(responseObject)
        }
    }

但是上面两个都假设了响应的性质，服务器是基于64解码来自JSON等的图像数据，但希望这说明了基本的模式。

或者，使用application/x-www-form-urlencoded请求，您可以在其中发送illustrated here二进制数据。

Answer 2

在https://stackoverflow.com/a/11092052/3871476

的帮助下，使用AFNetworking找到了解决方案

寻找解决方案的其他人。

let manager = AFHTTPRequestOperationManager(baseURL: NSURL(string: url))
let request = manager.POST(url, parameters: param, constructingBodyWithBlock: {(formData: AFMultipartFormData!) -> Void in
    formData.appendPartWithFileData(imgdata, name: "image[file]", fileName: "photo.jpeg", mimeType: "image/jpeg")
    }, success: {(operation: AFHTTPRequestOperation!, responseObject: AnyObject!) -> Void in
        //Success
    }, failure: {(operation: AFHTTPRequestOperation!, error: NSError!) -> Void in
        //Failure
        println(error.localizedDescription)
})

诀窍是使用"image[file]"参数。

Answer 3

试试这个：

    var request = NSMutableURLRequest(URL: NSURL(string: "https://\(IP):\(port)/")!)
    var response: NSURLResponse?
    var error: NSError?


    //Adding the JSON String in HTTP Body
    request.HTTPBody = NSJSONSerialization.dataWithJSONObject(jsonString, options: nil, error: &error)
    request.timeoutInterval = (number as! NSTimeInterval)
    request.HTTPMethod = "POST"
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
    request.setValue("gzip", forHTTPHeaderField: "Accept-encoding")

     let urlData = NSURLConnection.sendSynchronousRequest(request, returningResponse: &response, error: &error)

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