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?
答案 0 :(得分:5)
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。
答案 1 :(得分:1)
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。
答案 2 :(得分:0)
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)